The chemist has 14.4 days to perform the experiment.
What is the value of k in s-¹?The value of k in s-¹ is 0.0530.The number of decay events in the first second is 5.5 x 1012.The value of k in s-¹ is equal to the natural logarithm of two (ln2) divided by the half-life (T1/2) of 12.8 days. Therefore, k = ln2/12.8 days = 0.04968 s⁻¹.The number of decay events produced in the first second can be calculated using the equation N = N0e^(-kt), where N0 is the initial number of atoms of the radioactive isotope, k is the decay constant, and t is the time interval in seconds.Since the atomic mass of 64-Cu is 64.0 u and the mass of the sample is 28.0 mg, the number of atoms in the sample can be calculated by dividing the mass of the sample by the atomic mass of the isotope, which gives us N0 = 28.0 mg/64.0 u = 0.4375 x 10^24 atoms.Substituting this value for N0 and the value for k (0.04968 s⁻¹), we get N = 0.4375 x 10^24 e^(-0.04968s⁻¹) = 0.4375 x 10^24 e^(-0.04968) = 4.355 x 10^23. Therefore, the number of decay events produced in the first second is 4.355 x 10^23.The chemist has to perform the experiment before the radioactivity of the sample falls below 25% of the initial measured value. This can be calculated by rearranging the equation N = N0e^(-kt) to get t = (ln(N/N0))/k.Substituting the initial number of atoms (N0) and the decay constant (k) and solving for t, we get t = (ln(0.25N0))/0.04968 = (ln(0.25 x 0.4375 x 10^24))/0.04968 = 15.6 days. Therefore, the chemist has 15.6 days to perform the experiment.To learn more about half-life experiment refer to:
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make a claim about the length of time nitrogen spends in its reservoirs compared to the carbon cycle.
When compared to the carbon cycle, the nitrogen cycle has a longer residence time in its reservoirs. Nitrogen gas accounts for 78% of the Earth's atmosphere.
yet it is not commonly available in plant-usable forms. Nitrogen must first be transformed into a useable form, such as ammonia or nitrate, through the nitrogen fixation process. This process can occur naturally, such as by lightning or bacterial activity, or through human activities, such as fertilizer application. Nitrogen, once useful, may be taken up by plants and animals and eventually returned to the atmosphere via denitrification. Because the entire process might take decades to millennia, the nitrogen cycle is substantially slower than the carbon cycle. The polypeptide is a kind of protein. The The peptide bond also permits the polypeptide to be flexible, which is essential for its operation.The initial amino acid in a peptide is known as the N-terminal (NH2) residue, while the last amino acid is known as the C-termina.
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How you do this I need help filling this quiz out
It is a double displacement reaction since new products are produced by displacement both reaction molecules Ca + AlCl₃ → Cacl₂ + Al
2. AgNo₃ + MgCl₂ → AgCl + Mg(NO₃)₂
3. H₃PO₄ + NaOH → Na₃PO₄ + H₂O
4. Zn + AgCl → ZnCl₂ + Ag
5. H₂SO₄ + NaCN → Na₂SO₄ + HCN
6. HClO₃ + Ca(OH)₂ → Ca(ClO₃)₂ + H₂O
7. FeO + Cl₂ → FeCl₂ + O₂
8. BaO + H₂O → Ba(OH)₂ + H₂O
9. Mg + HBr → MgBr₂ + H₂
10. NO +Cl₂ → NOCl
Chemical reaction :
When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction. A chemical change is the transformation of one substance into another, the emergence of new compounds with distinct properties, or any combination of these. It happens when two compounds mix to create a new material (synthesis or either decomposes to form more substances).
How does a chemical reaction start?When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that start a chemical reaction, while products are the substances that come out of the process.
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What is the density If Length = 20.8cm, Width = 5.3cm, Height = 4.4cm,
and Mass = 287.57g?
The density would be 0.5929 g/cm3.
What is density?The density of an object is the ratio of the mass of the object to its volume.
This can be expressed mathematically as: Density = mass/volume
In this case, the dimension of the object is 20.8 cm x 5.3 cm x 4.4 cm. Thus, the volume of the object would be:
20.8 x 5.3 x 4.4 = 485.056 cm3
The mass of the object is given as 287.57 g.
Thus, density of the object = 287.57/485.056 =
In other words, the density of the object would be 0.5929 g/cm3
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2Cl2 + O2 → 2Cl2O
How many of each type of bond are present in the reactants?
How many of each type of bond are present in the product?
Use the Bond Energy Table to find the total change in bond energy. (187 kJ/mol)
Is this reaction endothermic or exothermic? How do you know?
Answer:
endothermic reaction; need more info on the reactants to answer the other questions
Explanation:
Given the change in bond energy of 187 kJ/mol, you can determine whether the reaction is endothermic or exothermic. If the bond energy is positive, the reaction is endothermic, meaning it absorbs energy. If the bond energy is negative, the reaction is exothermic, meaning it releases energy. In this case, the bond energy is positive so it's an endothermic reaction.
107.8682 47
731.0 1.93
Ag
Silver
[Kr] 4d1 5s¹
344
What is the atomic number?
The number assigned to a chemical element according to its atomic number in the periodic system, which places the elements in ascending order of the number of protons in their nuclei.
Why is it called atomic number?The quantity of protons in an atom is known as its atomic number. It is known as the proton number for this reason. It is represented in calculations by the capital letter Z. The word "Z" is derived from the German "zahl," which meaning "number of numerals" or "atomzahl," a more contemporary term that means "atomic number."Henry Moseley demonstrated in 1913 that an element's atomic number rather than atomic mass is its more fundamental characteristic.The quantity of positive charges in the atomic nucleus, according to a study written by Moseley in 1914, is what determines the atomic number. In addition, he claimed that between aluminium and gold, there were three undiscovered elements with the atomic numbers 43, 61, and 75.To learn more about periodic refer to:
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in principle all chemical reactions are reversible and can reach dynamic if all the reactants and products are present. this state occurs when the of the forward and reverse reactions are equal. true or false
Theoretically, every chemical reaction can be stopped and enter a dynamic state if all the reactants and products are present. The forward and reverse reactions are equivalent in this circumstance.
From the food our bodies digest to the way the sunlight we receive is created, chemical reaction occur all around us. Understanding physical and chemical changes is essential before beginning chemical processes. reversed reaction Reversible reactions occur when the reactants produce products, which then combine to produce the reactants once more. In a reaction where A and B combine to form C and D, or vice versa, C and D combine to form A and B.
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Below is the amino acid histidine at pH 7. Select all the atoms that are part of a plane of three or more atoms.
Histidine was unique among amino acids in that it could exist in neutral or positively charged states inside the functional pH range of 5.0 to 7.0.
As a result, histidine may interact with the other aromatic residues and establish hydrogen bonds between polar but also charged residues.
Histidine seems to be a semi-essential amino acid (which children should get from food) that's also required in humans for growth as well as tissue repair. It is also essential for the preservation of myelin sheaths which protect nerve fibers and therefore is metabolized towards the neurotransmitter histamine.
Histamines perform a variety of roles in immune function, gastrointestinal secretion, as well as sexual function. Histidine too is essential for the production of blood cells and protects tissues from harm due to radiation as well as heavy metals.
Thus, the correct answer is (B)
The question is incomplete, the complete question is :
Below is the amino acid histidine at pH 7. Select all the atoms that are part of a plane of three or more atoms.
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A gaseous reaction goes to completion in a piston-cylinder at constant pressure. after the reaction, the temperature is found to remain the same but the volume has halved. which of the following balanced reactions is consistent with these results?
a. N2 (g) + 3H2(g) → 2NH3(g)
b. A(g) + B2(g) → AB2(g)
c. 2AB(g) + B2(g) → 2AB2(g)
A gaseous reaction goes to completion in a piston-cylinder at constant pressure. after the reaction, the temperature is found to remain the same but the volume has halved is A(g) + B2(g) → AB2(g). so, option (b) is correct.
What is gaseous reaction ?
A chemical reaction known as a "gas evolution reaction" produces gases like oxygen or carbon dioxide as one of its byproducts. A fume chamber can be used to conduct gas evolution reactions when the byproduct gases are explosive or hazardous to breathe.
What is pressure ?
The pressure is nothing but the vital force applied to the object or particle. Pressure calculates how much force will be gone or extended to the object. Pressure is the force that is perpendicular to the power of extension. The standard unit of pressure is the pascal (pa).The formula for pressure, p= F/ Ap= pressure, F= magnitude, A= area of the surface pressure is the scalar quantity. Pressure is also expressed in the term atmospheric pressure, atm.
Therefore, gaseous reaction goes to completion in a piston-cylinder at constant pressure. after the reaction, the temperature is found to remain the same but the volume has halved is A(g) + B2(g) → AB2(g). so, option (b) is correct.
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propose five combinations of aqueous ionic reagents that likely would form a precipitate when they are mixed
propose five combinations of aqueous ionic reagents that likely would form a precipitate when they are mixed NaCl + AgNO3 (aq) (aq) CaCl2 (aq) + Na3PO4 (aq) CuSO4 (aq).
+ Zn(NO3)2 BaCl2 (aq) + Na2SO4 (aq) (aq) KI + Pb(NO3)2 (aq) (aq) Silver chloride (AgCl) precipitates from sodium chloride (NaCl) and silver nitrate (AgNO3). Lead (II) nitrate (Pb(NO3)2) and potassium iodide (KI) combine to generate lead (II) iodide (PbI2). Copper (II) sulfate (CuSO4) and sodium hydroxide (NaOH) combine to generate copper (II) hydroxide (Cu(OH)2).Aluminum chloride (AlCl3) reacts with sodium hydroxide (NaOH) to generate aluminum hydroxide (Al(OH)3). Barium chloride (BaCl2) and sodium sulfate (Na2SO4) react to generate barium sulfate (BaSO4).and silver nitrate (AgNO3). Lead (II) nitrate (Pb(NO3)2) and potassium iodide (KI) combine to generate lead (II) iodide (PbI2). Copper (II) sulfate (CuSO4) and sodium hydroxide (NaOH) combine to generate copper (II) hydroxide .
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A calorimeter was used to determine the molar enthalpy of a solution of AICI3. When a sample of AlCl3 was dissolved in water, the following data were collected. Mass of AICI: Mass of H2O(g) Final Temp. (°C) Initial Temp. (°C) 20.0 10.0 250.0 46.3 Determine the molar heat (kJ/mol) of solution. Answer in 3 Sig fig, include sign.
The molar heat of solution of AICI₃ is 56.8 kJ/mol.
To determine the molar enthalpy of the solution, we can use the equation:
q = mcΔT
where q is the heat absorbed or released by the solution, m is the mass of the solvent (in this case, water), c is the specific heat of the solvent, and ΔT is the change in temperature of the solution.
Calculate the heat absorbed or released by the solution using the equation:
q = mcΔT
q = (10 g) (4.18 J/g·°C) (250 - 46.3)
q = 8526.882 J
Then we can calculate the number of moles of solute using the molar mass of the solute:
n = m / M
n = (20 g) / (133.34 g/mol)
n = 0.15 mol
Finally, use this value of n to calculate the molar enthalpy of solution using the formula:
ΔH = (q / n)
Where n is the number of moles of solute (AlCl₃) and ΔH is the molar enthalpy of solution.
ΔH = (8526.882 J) / (0.15 mol)
ΔH = 56845.88 J/mol
ΔH = (56845.88 J/mol)(1 kJ/1000 J)
ΔH = 56.8 kJ/mol
Hence, the molar heat of solution is 56.8 kJ/mol (3 sig figs).
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giving reasons, state which carbocation out of the two below 2 would be more stable: (A) (ch3)3c - CH2+ (B) (CH3)3C^+ (c) CH3CH2CH2^+ (d) CH3 CH^+ CH2CH3
The amount of alkyl groups connected to the positive carbon, the degree of substitution on the positive carbon, and the presence of electron-donating or electron.
withdrawing groups all influence the stability of carbocations. Carbocation (C) CH3CH2CH2+ is thought to be more stable than carbocation (B) (CH3)3C+ based on these reasons. This is due to the fact that carbocation (C) contains three alkyl groups connected to the positive carbon, converting it to a tertiary carbocation, which is more stable than a secondary carbocation (B). In addition, carbocation (D) CH3 CH+ CH2CH3 is thought to be more stable than carbocation (C) CH3CH2CH2+. This is due to the fact that the positive carbon in carbocation (D) is surrounded by both methyl and ethyl groups, converting it to a tertiary allylic carbocation, which is much more stable.
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The compound diborane (B2H6) was at one time considered for use as a rocket fuel. Its combustion reaction is
B₂H6(g) +3O2(Ł)→ 2 HBO2(g) + 2H₂O(Ł)
The fact that HBO2, a reactive compound, was produced rather than the relatively inert B₂O3 was a factor in the discontinuation of
the investigation of the diborane as a fuel. What mass of liquid oxygen (LOX) would be needed to burn 259.9 g of B₂H6,
Answer in units of g.
What mass of HBO2 is produced from the combustion of 103.7 g of B2H6?
Answer in units of g.
a) The mas of the oxygen is 893 g
b) The mass of the oxide is 326 g
What is the stoichiometry of the reaction?
We know that the stoichiometry of the reaction would depend on the balanced reaction equation as we can see in the question that we have here.
Now we know that;
Number of moles of borane = 259.9 g/28 g/mol
=9.3 moles
If 1 mole of borane reacts with 3 moles of oxygen
9.3 moles of borane reacts with x moles of oxygen
x =27.9 moles
Mass of oxygen = 27.9moles * 32 g/mol = 893 g
b)
Number of moles of borane = 103.7 g/28 g/mol
=3.7 moles
If 1 moles of borane produces 2 moles of the oxide
3.7 moles of borane would produce 3.7 * 2/1
= 7.4 moles
Mass of the oxide = 7.4 moles * 44 g/mol
=326 g
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in the dna isolation process, is used to break down the protein complexes and allow the dna molecules to easily precipitate. MULTIPLE CHOICE A. meat tenderizer B. salt C. none of the answer choices are correct. D. ethanolsodium chloride
In the DNA isolation process, meat tenderizer is used to break down the protein complexes and allow the DNA molecules to easily precipitate.
The purification of DNA from a sample is accomplished by a process known as DNA isolation, which makes use of both physical and chemical techniques. An enzyme known as meat tenderizer is responsible for further dissolving DNA by reducing the strength of protein-DNA interactions. Where the alcohol and strawberry mixture come together, isopropyl alcohol causes the DNA strands that were previously dissolved to become solid. The strands are easier to clump and stick together because to the salt. When combined with the meat, these proteolytic enzymes break down the proteins in the muscle as well as hydrolyze collagen and elastin, which contributes to the tenderization of the meat.
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Identify the type of friction acting in each scenairo
A surfer rides an ocean wave is fluid friction
A bowling ball travels down a bowling lane rolling friction
A baseball flies through the air is air resistance
A hose rests on the edge of a truck is static friction.
What is friction?Friction is described as the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
Static friction is that force that keeps an object at rest.
It is that friction experienced when individuals try to move a stationary object on a surface, without actually triggering any relative motion between the body and the surface on which it is on.
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Complete question:
dentify the type of friction acting in each scenario.
A surfer rides an ocean wave.
A bowling ball travels down a bowling lane.
A baseball flies through the air.
A hose rests on the edge of a truck.
OPTIONS:
air resistance
fluid
rolling
sliding
static
Reaction rate is expressed in terms of changes in the concentration of reactants and products. Write a balanced equation for the following rate expression:
Rate = − (Δ[CH4]/Δt) = − 1/2 (Δ[O2]/Δt) = 1/2 (Δ[H2O]/Δt) = Δ[CO2]/Δt You do not need to include the states of matter in your answer.
The balanced equation for this reaction is:
CH4 + 2O2 -> CO2 + 2H2O
This equation is balanced because each element has the same number of atoms on both sides of the equation. According to the rate expression, the concentrations of O2, H2O, and CO2 are all inversely correlated with the concentration of CH4. This implies that O2, H2O, and CO2 concentrations increase as CH4 concentrations fall. According to the coefficient of 1/2 in front of O2 and H2O, the reaction is happening at a 2:1 ratio, which means that for every CH4 molecule that reacts, 2 molecules of O2 and 2 molecules of H2O are created. The absence of the CO2 coefficient in the rate expression indicates that the concentration of CO2 is directly proportional to the change in concentration of CH4.
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PLS HELP I DONT GET REDOX TITRATIONS
Potassium dichromate is used to titrate a solution of iron (II) chloride. The dichromate ion acts as its own indicator. As the Cr2O7^2- solution is added to the Fe^2+ solution, the orange dichromate ion is reduced to green Cr^3+ as it oxidizes the Fe^2+ to Fe^3+. The equivalence point is evident when the orange color remains, indicating that all the Fe^2+ has reacted. An amount of 20.0 mL of acidified FeCl2.
a) Balance the redox equation for this titration: Cr2O7^2- + Fe^2+ --> Cr^3+ + Fe^3+
b) What was the [FeCl2]?
The balanced redox reaction equation is written as;
[tex]2Cr_{2} O_{7} ^{2-} + 6Fe^{2+} +14H^+----- > 2Cr^{3+} + 6Fe^{3+} + 7H_{2} O[/tex]
What is the balanced redox reaction equation?We know that when we talk about the redox reaction, one of the species in the reaction has been oxidized while one of the species in the reaction has been reduced. As such, there would be a loos and gain of electrons in the process.
In this case, we can see that we have to write down the reaction equation and then we can be able to obtain the balanced reaction equation which would show the electrons that have been lost or gained.
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assuming all are in the liquid phase, which of the following substances would you expect to be able to place the maximum number of drops of on the surface of the penny?
The material with the highest surface tension is the one that can hold the most drips on a penny. So, [tex]HF[/tex] is the correct answer.
It behaves as though its surface were an elastic membrane because of a liquid quality. The The strength of this membrane-like activity increases with a liquid's surface tension. Because of this, a liquid with a high surface tension will favor taking the shape of an object with a limited surface area. This explains why a high surface tension liquid develops into a more compact shape, allowing for the placement of more droplets on the coin, as opposed to a low surface tension liquid. In other words, the amount of droplets that can fit on a penny depends on the surface tension of the liquid.
A penny can hold the most drops on the substance with the highest surface tension. A liquid's surface's elastic tendency to reduce surface area is referred to as surface tension. As the most electronegative element, fluorine creates stronger hydrogen bonds, which contribute to higher surface tension.
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The complete question is:
On the surface of a penny, liquid droplets are put as part of an experiment. Assuming all are in the liquid phase, which of the following substances would you expect to be able to place the maximum number of drops of on the surface of the penny?
a) [tex]HF[/tex]
b) [tex]H_2O[/tex]
c) [tex]CH_3CH_2CHO[/tex]
d) [tex]CCl_4[/tex]
Dichloromethane (CH₂Cl₂) is a non-polar organic solvent that is immiscible with water. A
25.00 ml sample has a mass of 33.13 g at 25° C. You need exactly 252.5 ml of
dichloromethane for an experiment but can't find any volumetric glassware around the lab.
What mass (grams) should you weigh out to give you the required volume at 25° C. (Hint:
Determine the density of dichloromethane) Round to one decimal place.
The mass of Dichloromethane used in the above reaction has a similar density throughout the reaction.
What is density?The density and mass concentration of a pure substance is numerically equivalent. Density can affect buoyancy, purity, and packing. Varied materials typically have different densities. At normal temperatures and pressures, osmium and iridium have the highest densities of any known elements.
mass is occasionally substituted by the dimensionless quantity "relative density" or "specific gravity," i.e. the ratio of the material's density to that of a standard material, typically water, to make density comparisons across different systems of units easier. In other words, if a substance's relative density is less than one in relation to water, it floats.
Temperature and pressure affect a substance's density.
We know that density will be the same throughout mixing.
Hence, density = mass/ volume
now comparing density for both the condition we get
33.13 / 25= mass / 252.5
Mass = 33461 g
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Determine the [OH−] , pH, and pOH of a solution with a [H+] of 0.0078 M at 25 °C. Determine the [H+] , pH, and pOH of a solution with an [OH−] of 0.0011 M at 25 °C. Determine the [H+] , [OH−] , and pOH of a solution with a pH of 7.77 at 25 °C. Determine the [H+] , [OH−] , and pH of a solution with a pOH of 2.15 at 25 °C.
a) The pH of the solution is 2.11
b) The pH of the solution is 2.96
c) The [H+] of the solution is 1.69 * 10^-8
d) The [OH−] of the solution is 7.1 * 10^-3
What is the pH?What we call the pH of the solution is the negative logarithm of the hydrogen ion concentration of the solution. In this case, we have been asked to obtain the pH of the solution at different points.
a) pH = -log (0.0078 )
= 2.11
pOH = 14 - 2.11 = 11.89
[OH−] = Antilog (-11.89)
= 1.3 * 10^-12
b) pH = -log (0.0011)
= 2.96
pOH = 14 - 2.96
= 11.04
[OH−] = Antilog (-11.04)
= 9.1 * 10^-12
c) [H+] = Antilog (-7.77)
= 1.69 * 10^-8
[OH−] = 1 * 10^-14/1.69 * 10^-8
= 5.9 * 10^-7
pOH = -log( 5.9 * 10^-7)
= 6.22
d) [OH−] = Antilog (-2.15)
= 7.1 * 10^-3
[H+] = 1 * 10^-14/ 7.1 * 10^-3
= 1.41 * 10^-12
pH = -log( 1.41 * 10^-12)
= 10.9
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which of the following is an incorrect statement about the number of electrons lost or gained by a representative element during ion formation?
The incorrect statement about the number of electrons that is lost or gained by a representative element during the ion formation is E) no correct response .
The correct statements are given as :
A) The number is usually 3 or less. This statement is true about the number of electrons that is lost or gained by a representative element during the ion formation.
B) The number is governed by the octet rule. This statement is true.
C) The number is related to the position of the element in the periodic table. This statement is true about the number of electrons that is lost or gained by a representative element during the ion formation
This question is incomplete, the complete question is :
Which of the following is an incorrect statement about the number of electrons lost or gained by a representative element during ion formation?
A) The number is usually 3 or less.
B) The number is governed by the octet rule.
C) The number is related to the position of the element in the periodic table.
D) more than one correct response
E) no correct response
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for each of the following compounds, draw in all h atoms, label each unique h atom(s) that would give a distinct signal in 1h nmr (e.g. ha, hb, etc.), then indicate the expected multiplicity of signals from each proton signal.
When a proton is coupled to two different neighboring proton sets with identical or very close coupling constants.
Define unique atoms?
The atomic number (Z) of an element is the number of protons in the nucleus of each atom of that element. This means that the number of protons is the characteristic which makes each element unique compared to all other elements.Carbon atoms are unique because they can bond together to form very long, durable chains that can have branches or rings of various sizes and often contain thousands of carbon atoms. Silicon and a few other elements can form similar chains; but they are generally shorter, and much less durable.One chemist, John Dalton, suggested that these elements were made up of atoms and that the atoms of an element are all the same. This simple model could explain the millions of different materials around us. There are more than 109 different types of atom - one for each element.To learn more about atoms refers to:
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HELPPP ASAP!!!
Compare the Earth’s mantle and core by writing each characteristic in the correct area of the
CORE & MANTLE
Venn diagram.
Semi-solid
Less dense
Made of rock
Composed of two parts
Creates Earth’s magnetic field
More dense
Solid and liquid
Mostly metallic
Thickest layer of Earth
Increased pressure with depth
Increased temperature with depth
Answer: Ok here you go....
Explanation:
Core:
Semi-solid
Composed of two parts
Create Earth's magnetic field
More Dense
Mostly metallic
Both:
Increased pressure with depth
Increased temperature with depth
Mantle:
Less Dense
Made of rock
Thickest layer of Earth
Pretty sure solid and liquid is the core but I'm not certain.
When observing a rainbow, the sun is always at your back. Because most showers move
from west to east, a rainbow in the morning means the shower is approaching; a rainbow
in the evening means showers are departing.
According to the information provided, what conclusion can be drawn about rainbows?
A. All rainbows are equal in color intensity and dimension.
B. A rainbow always occurs at the end of a powerful storm.
C. The absorption and retention of light make up the first stage in the creation of a
rainbow.
D. A rainbow usually occurs when the sun is setting.
E. Refraction, reflection, and diffraction of light are essential in the formation of a
rainbow.
Answer:
E. Refraction, reflection, and diffraction of light are essential in the formation of a rainbow.
According to the information provided, it is stated that the sun is always at your back when observing a rainbow, and that the time of day can indicate whether a shower is approaching or departing. This suggest that the formation of the rainbow is dependent on the position of the sun and the presence of water droplets in the air, which are refracted, reflected, and diffracted by the light from the sun. It doesn't indicate anything about the color intensity or dimension of the rainbow, nor whether it always occurs at the end of a powerful storm or when the sun is setting.
PLSS HELP ITS THE LAST QUESTION I NEED!!!!!!! ALOT OF POINTS!!!
Which of the following statements is true?
People in an experiment do not have the right to refuse participation.
Scientists must make moral decisions on controversial issues.
Honest mistakes do not need to be corrected because they are not made on purpose.
If you don't know a law exists, it's ok to not follow it.
The true statement on conduct in experiments is B. Scientists must make moral decisions on controversial issues.
How should scientists behave in experiments ?Scientists have an ethical responsibility to conduct experiments in a responsible and unbiased manner, with the goal of advancing scientific knowledge and understanding. In order to fulfill this responsibility, scientists should adhere to a number of principles and guidelines when conducting experiments.
This is why they must make moral decisions when it comes to controversial issues.
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refer to the figure showing the structure of methyl acetate. which statement explains why this compound can form hydrogen bonds with water but not with itself?
Refer to the figure showing the structure of methyl acetate. why this compound can form hydrogen bonds with water but not with itself because This compound lacks a hydrogen atom in a highly polar bond.
ABOUT METHYL ACETATEMethyl acetate, also known as MeOAc, acetic acid methyl ester or methyl ethanoate, is a carboxylate ester with the formula CH3COOCH3. It is a flammable liquid with a characteristically pleasant smell reminiscent of some glues and nail polish removers. Methyl acetate is occasionally used as a solvent, being weakly polar and lipophilic, but its close relative ethyl acetate is a more common solvent being less toxic and less soluble in water. Methyl acetate has a solubility of 25% in water at room temperature. At elevated temperature its solubility in water is much higher. Methyl acetate is not stable in the presence of strong aqueous bases or aqueous acids. Methyl acetate is not considered a VOC in the USA.
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The hexaaqua complex [Ni(H_2O)_6]^2+ is green, whereas the hexaammonia complex [Ni(NH_3)_6]^2+ is violet. Explain. H_2O has a weaker ligand strength than NH_3; therefore, a complex with H_2O absorbs a shorter wavelength of light than a complex with NH_3. NH_3 has a weaker ligand strength than H_2O; therefore, a complex with NH_3 absorbs a shorter wavelength of light than a complex with H_2O.
This difference in ligand strength causes the two complexes to absorb different wavelengths of light, resulting in different colors.
The difference in ligand strengthThe hexaaqua complex [Ni(H_2O)_6]^2+ absorbs green light and appears green, while the hexaammonia complex [Ni(NH_3)_6]^2+ absorbs violet light and appears violet.The color of a complex is determined by the wavelength of light it is able to absorb. The wavelength of light absorbed is dependent on the ligand strength of the ligands that bind the metal ion in the complex. The ligand strength of a ligand is determined by the number of electrons it can donate to the metal ion. H_2O is a weak ligand and can donate only two electrons to the metal ion, whereas NH_3 can donate four electrons. This makes NH_3 a stronger ligand than H_2O. As a result, a complex with H_2O will absorb a longer wavelength of light than one with NH_3. This means that the hexaaqua complex [Ni(H_2O)_6]2+ will absorb a longer wavelength of light and therefore appear green, while the hexaammonia complex [Ni(NH_3)_6]2+ will absorb a shorter wavelength of light, appearing violet. The ligand strength of a particular ligand is determined by the type of ligand, the number of electrons it can donate, and the strength of the bond it forms with the metal ion. The ligand strength of a ligand can also be affected by the other ligands in the complex, due to the formation of a synergistic effect.To learn more about the ligand field theory refer to:
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isoniazid is used in the treatment of tuberculosis and multiple sclerosis. identify each lone pair as either localized
The pairs has been identified as lone or localized, N is a lone pair and NH₂ is localized.
Isoniazid, also known as nydrazid, is a popular antibiotic used to treat and prevent tuberculosis and other illnesses. For specific forms of tremor in multiple sclerosis (MS), isoniazid is administered. Usually, substantial dosages of the antibiotic (600–1200 mg daily) are needed to treat MS tremors. To avoid contracting active TB disease, you can take medication. The medications Isoniazid and Rifapentine (INH-RPT) are combined to treat LTBI. They eliminate the dormant tuberculosis bacteria before you become unwell. The TB bacteria are powerful and can be killed by the medication over several months. Isoniazid is used to treat or prevent tuberculosis (TB) (reactivation). It can be used either on its own or in conjunction with other medications to cure TB or stop it from coming back (reactivation).
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energy an ecosystem, whereas chemical elements . answer unselected is burned in; are wasted unselected flows through; cycle within it unselected is lost in; are created unselected cannot be created nor destroyed in; disappear unselected is recycled in; flow through it unselected i don't know yet
In contrast to the worldwide recycling of chemical elements, energy travels via ecosystems.
An ecosystem is a region where a bubble of life is created by plants, animals, and other organisms interacting with the weather, environment, and other factors. Abiotic variables, or nonliving components, coexist with biotic components in ecosystems.
The food chain and food web are used to transfer energy. Plants, who are the primary energy providers in the ecosystem, use their chloroplasts to collect sunlight, which is then partially converted into chemical energy during photosynthesis.
Joules or calories are used to measure the energy input, or the energy that enters the environment. As a result, the energy flow is sometimes referred to as the calorific flow.
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zn(s) is used to reduce other compounds in chemical reactions. if a chemist needs a substance that is more effective in its reducing ability, which of the following species would be the best choice? A. Na B. H^+ C. K^+ D. Cl^-
The species would be the best choice if a chemist needs a substance that is more effective in its reducing ability = Na (option A)
An element's reducing ability is defined as its ability to lose electrons. It assists the other element in gaining electrons and thus functions as a reducing agent.
The substance with the highest positive reduction potential is always reduced and undergoes a reduction reaction. Alternatively, the substance with the highest negative reduction potential will always be oxidized and undergo an oxidation reaction.
Elemental sodium is a good reducing agent because it belongs to group I, and elements in group I have one electron in their valence sheet. As a result, they readily lose 1 electron to achieve noble gas configuration, undergoing oxidation (i.e. electron loss) and acting as a good reducing agent.
The standard reduction potential of sodium will be:
Na ⇒ Na⁺ + e⁻
E⁰ Na⁺ / Na = -2.71 V
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5 F2 (g) + 2 NH3 (g) → N2F4 (g) + 6 HF (g) If you reacted 2.42 moles of F2 how many moles of HF would be produced?
Answer:
The balanced equation is telling us that for every 5 moles of F2 that react, 6 moles of HF are produced.
To find out how many moles of HF would be produced if we have 2.42 moles of F2, we can use the following conversion:
moles of HF = (moles of F2) x (moles of HF/moles of F2)
moles of HF = (2.42 moles) x (6 moles / 5 moles)
moles of HF = 2.92 moles
So 2.92 moles of HF would be produced if you reacted 2.42 moles of F2.