Answer:
The answer is C
Explanation:
It just makes the most sense to me
1. This is very important in preventing the spread of pathogens in the kitchen.
Can somebody please help me!!!
Answer:
javier applied force how this helps
state the conditions under which copper reacts with sulphuric (vi) acid and give an equation for the reaction
Answer:
When the metal reacts with hot, concentrated sulphuric acid, the products of the reaction are copper (II) sulphate, sulphur dioxide and water. Cu + 2H2SO4 = CuSO4 + SO2 + 2H2O. This is a typical redox reaction in which the acid is reduced to SO2, but no hydrogen is produced here
100 POINTS!!!!!!!
The following diagram shows the branching tree for four kingdoms and some of their shared derived characteristics.
A slanting line is shown. There are four lines drawn vertically on this line at equal intervals. There is a black circle between each pair of these vertical lines. Protists, Plants, Fungi, Animals are written on top of each vertical line in order from left to right. Common Cell is written on the left most end of the sloping line. The second black circle has Mostly Multicellular written on it. The first black circle has X written on it.
What shared characteristic can be written at point X? Use complete sentences to explain your answer.
Answer:
The answer could be "Autotrophs that photosynthesis".
Explanation:
At point X, the common characteristic can be written. The common character between protists and plants is autotrophs that photosynthesize which is the characteristic of plant-like protists. Plant-like protists are autotrophs, use carbon dioxide and water to produce glucose by the process of photosynthesis.
1. Which of these is not a macromolecule? a) Alab) protein c) polysaccharide d) nucleic
acid
Answer:
a) alab
Explanation:
Two of the main macromolecules are proteins and nucleic acid, and a polysaccharide is multiple monomers (monosaccharide) that join to create another macromolecule called carbohydrates.
Consider this statement: Earth is the only source of gravity in the solar system. Do you agree? Give
your reasons.
Answer:
Explanation:
You're kidding, right?
Earth is a puny little planet stuck in the Milky Way which is not a particularly large galaxy that has millions of stars with many times more our gravitational influence.
We are very lucky that the gravitational force is so weak. Were it not, We would be pulled in every direction imaginable and swallowed many times by larger and larger black holes until our existence could never be traced.
We would be like 1 electron in all the atoms of the Universe combined. There's no end to the size and scope of the forces involved if the gravitational force were even a small bit larger than what it is now.
What does evaporation produce?
a precipitation
b rain or snow
C water vapor
d condensation
Answer:
C water vapor.
or saturated water vapor ( steam )
How does the entropy change in the reaction 2C3H6(g) + 9O2(g) → 6C02(g) + 6H2O (g)?
I will mark brainliest!! Thank you so much!!
Answer:
The entropy increases!!!
Explanation:
a pex
The entropy increases in the reaction.
What is entropy?Entropy is defined as the measure of the disorder of a system.Entropy is an extensive property of a thermodynamic system, to put it in simple words, its value changes depending on the amount of matter that is present.Entropy is denoted by the letter S and has units of joules per kelvin (JK−1)The entropy increases in the reaction if the total number of product molecules are greater than the total number of reactant molecules.
2C3H6(g) + 9O2(g) → 6C02(g) + 6H2O (g)
In the above reaction, the product molecules are greater than the reactant molecules. Hence, entropy increases.
Hence, we can conclude that option A is the answer.
To learn more about entropy here
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The relation between molarity and normality is expresses as: a) M = N x g.e.w/g.m.w
b) M = N x g.m.w/ g.e.w
c) M = N x no. of equiv./mole
d) M = N x no. of g.m.w/mole
Answer: [tex]Molarity=Normality\times \frac{gew}{gmw}[/tex]
Explanation:
Molarity is defined as the number of moles dissolved per liter of the solution.
[tex]Molarity=\frac{\text {moles of solute}}{\text {Volume in L}}[/tex]
[tex]{\text {moles of solute}=\frac{\text {given mass}}{\text {Molar mass}}[/tex]
Normality is defined as the number of gram equivalents dissolved per liter of the solution.
[tex]Normality=\frac{\text {gram equivalents of solute}}{\text {Volume in L}}[/tex]
[tex]{\text {gram equivalents of solute}}=\frac{\text {given mass}}{\text {Equivalent mass}}[/tex]
Thus [tex]Molarity=Normality\times \frac{\text {Equivalent mass}}{\text {Molar mass}}[/tex]
A piece of Li is
dropped into water
and catches fire
producing LiOH
is a Chemical or physical change
Complexes containing metals with d10 electron configurations are typically colorless because ________. Complexes containing metals with d10 electron configurations are typically colorless because ________. d electrons must be emitted by the complex in order for it to appear colored there are no d electrons to form bonds to ligands a complex must be charged to be colored there is no d electron that can be promoted via the absorption of visible light the empty d orbitals absorb all of the visible wavelengths
Answer:
there is no d electron that can be promoted via the absorption of visible light
Explanation:
One of the properties of transition elements is the possession of incompletely filled d orbitals. This property accounts for their unique colours.
The colours of transition metal compounds stem from d-d transition of electrons due to the presence of vacant d orbitals of appropriate energy to which electrons could be promoted.
For elements whose atoms have a d10 configuration, such vacant orbitals does not exist hence their compounds are not colored.
Sometimes, the colour of transition metal compounds stem from ligand to metal charge transfer(LMCT) for instance in KMnO4.
What are primary observations in science?
Answer:
Observation is the active acquisition of information from a primary source. In living beings, observation employs the senses. In science, observation can also involve the recording of data via the use of scientific instruments. The term may also refer to any data collected during the scientific activity.
Explanation:
As an FDA physiologist, you need 0.625 L of phosphoric acid acid / dihydrogen phosphate (H3PO4 (aq) / H2PO4 - (aq) ) buffer with a pH of 2.75. How do you prepare this solution from stock solutions of 1.0 M H3PO4 (formic acid) and 1.5 M NaOH
Answer:
0.4058L of 1.0M H3PO4
0.2192L of 1.5M NaOH
Explanation:
The pKa of the H3PO4 / H2PO4- buffer is 2.12
To solve this question we must use H-H equation for this system:
pH = pKa + log [H2PO4-] / [H3PO4]
2.75 = 2.12 + log [H2PO4-] / [H3PO4]
0.63 = log [H2PO4-] / [H3PO4]
4.2658 = [H2PO4-] / [H3PO4] (1)
Where [] could be taken as the moles of each reactant
As you have H3PO4 solution, the reaction with NaOH is:
H3PO4 + NaOH → H2PO4- + Na+ + H2O
As you can see, both H3PO4 and H2PO4- comes from the same 1.0M H3PO4 solution
The moles of H3PO4 are:
[H3PO4] = Moles H3PO4 - Moles NaOH
And for H2PO4-:
[H2PO4-] = Moles NaOH added
Replacing in (1):
4.2658 = [Moles NaOH] / [Moles H3PO4 - Moles NaOH]
4.2658 Moles H3PO4 - 4.2658 moles NaOH = Moles NaOH
4.2658 Moles H3PO4 = 5.2658 moles NaOH (1)
In volume:
0.625L = Moles H3PO4 / 1.0M + Moles NaOH / 1.5M
0.625 = Mol H3PO4 + 0.6667 Moles NaOH (2)
Replacing (2) in (1):
4.2658 Moles H3PO4 = 5.2658 (0.625 - Mol H3PO4 / 0.6667)
4.2658 Moles H3PO4 = 5.2658 (0.625 - Mol H3PO4) / 0.6667
4.2658 Moles H3PO4 = 5.2658*(0.9375 - 1.5 mol H3PO4)
4.2658 Moles H3PO4 = 4.9367 -7.8983 mol H3PO4
12.1641 mol H3PO4 = 4.9367
Mol H3PO4 = 0.4058moles * (1L / 1.0moles) =
0.4058L of 1.0M H3PO4
And:
0.625L - 0.4058L =
0.2192L of 1.5M NaOH
How many grams of magnesium
sulfate (MgSO4) are dissolved in
0.965 L of a 0.0575 M solution?
Molar Mass Mg: 24.30 g/mol
Molar Mass S: 32.06 g/mol
Molar Mass O: 16.00 g/mol
Answer:6.68
Explanation:
what is the method of seperating inmisible liquid
with recessions government spending should
decrease
increase
or allowed to remain the same increased
Answer:
Increase to pay unemployment and get the economy back up
22.4 L is the volume of any gas regardless of atmospheric conditions.
O True
O False
What volume of 0.215 M HCl is required to neutralize 50.0 mL of
0.800 M NaOH?
Answer:
186 mL HCl
Explanation:
M1V1 = M2V2
M1 = 0.215 M HCl
V1 = ?
M2 = 0.800 M NaOH
V2 = 50.0 mL
Solve for V1 --> V1 = M2V2/M1
V1 = (0.800 M)(50.0 mL) / (0.215 M) = 186 mL HCl
A transverse wave is observed to be moving along a lengthy rope. Adjacent crests are positioned 2.4 m apart. Exactly six crests are observed to move past a given point along the medium in 9.1 seconds. Determine the frequency of these waves
Answer:
f = 0.65 hz
Explanation:
Given that,
The distance between adjacent crests, wavelength = 2.4 m
6 crests are observed to move past a given point along the medium in 9.1 seconds.
We need to find the frequency of these waves.
We know that,
Frequency = no. of waves per second.
[tex]f=\dfrac{6}{9.1}\ Hz\\\\=0.65\ Hz[/tex]
So, the frequency of these waves is equal to 0.65 Hz.
Please give me the answer please
Answer:
A. 30cm³
Explanation:
Based on the chemical reaction:
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂
1 mol of calcium carbonate reacts with 2 moles of HCl to produce 1 mol of CO₂
To solve this question we must convert the mass of each reactant to moles. With the moles we can find limiting reactant and the moles of CO₂ produced. Using PV = nRT we can find the volume of the gas:
Moles CaCO₃ -Molar mass: 100.09g/mol-
1.00g * (1mol / 100.09g) = 9.991x10⁻³ moles
Moles HCl:
50cm³ = 0.0500dm³ * (0.05 mol / dm³) = 2.5x10⁻³ moles
For a complete reaction of 2.5x10⁻³ moles HCl there are necessaries:
2.5x10⁻³ moles HCl * (1mol CaCO₃ / 2mol HCl) = 1.25x10⁻³ moles CaCO₃. As there are 9.991x10⁻³ moles, HCl is limiting reactant.
The moles produced of CO₂ are:
2.5x10⁻³ moles HCl * (1mol CO₂ / 2mol HCl) = 1.25x10⁻³ moles CO₂
Using PV = nRT
Where P is pressure = 1atm assuming STP
V volume in L
n moles = 1.25x10⁻³ moles CO₂
R gas constant = 0.082atmL/molK
T = 273.15K at STP
V = nRT / P
1.25x10⁻³ moles * 0.082atmL/molK*273.15K / 1atm = V
0.028L = V
28cm³ = V
As 28cm³ ≈ 30cm³
Right option is:
A. 30cm³ How tightly particles are packed determines what state it takes.
True or False
Answer:
True
Explanation:
tighter the molecules the slower it moves and the harder it gets
solid has very tight particles packed together
gas has its particles spread out
what is a chemical property
Answer:
Chemical property is a characteristic of a particular substance that can be observed in a chemical reaction.
Explanation:
Hope this helps :)
Answer:
A chemical property is any of a material's propertiesthat becomes evident during, or after, a chemicalreaction; that is, any quality that can be established only by changing a substance's chemical identity. ... They can also be useful to identify an unknown substance or to separate or purify it from other substances.
How many grams of hydrogen gas are needed to completely react with excess nitrogen to produce 26.7 grams of ammonia (NH3)? N2 + H2 → NH3
Answer:
4.74 g H2
Explanation:
First, balance your reaction:
N2 + 3H2 --> 2NH3
Now convert 26.7 g NH3 to moles NH3 by dividing by its molar mass (17.031 g/mol). Then multiply by the mole ratio of 3 mol H2 for every 2 mol NH3 to get moles of H2. Finally multiply by the molar mass of H2 (2.016 g/mol) to get grams of H2.
26.7 g NH3 • (1 mol NH3 / 17.031 g NH3) • (3 mol H2 / 2 mol NH3) • (2.016 g H2 / 1 mol H2) = 4.74 g H2
Nitric acid and nitrogen monoxide react to form nitrogen dioxide and water, like this: (aq)(g)(g)(l) At a certain temperature, a chemist finds that a reaction vessel containing a mixture of nitric acid, nitrogen monoxide, nitrogen dioxide, and water at equilibrium has the following composition: compoundamount Calculate the value of the equilibrium constant for this reaction. Round your answer to significant digits.
Answer:
The reaction given is
Chemistry homework question answer, step 1, image 1
Since in equilibrium constant expression, the concentration of liquid components is not written.
Hence the equilibrium constant expression for the above reaction can be written as
Chemistry homework question answer, step 1, image 2
where [NO] = equilibrium concentration of NO
[NO2 ] = equilibrium concentration of NO2
[HNO3 ] = equilibrium concentration of HNO3
Step 2
Given : mass of NO at equilibrium = 18.6 g
mass of NO2 at equilibrium = 15.1 g
and mass of HNO3 at equilibrium = 13.1 g
Since molar mass of HNO3 = 63 g/mol, molar mass of NO = 30 g/mol and molar mass of NO2 = 46 g/mol
Hence the moles of gases at equilibrium are
Chemistry homework question answer, step 2, image 1
Step 3
Since mass of solution = mass of HNO3 + mass of water = 13.1 + 234.8 = 247.9 g
Assuming density of solution = density of water = 1.00 g/mL
=> mass of solution = volume of solution X density of solution
=> 247.9 = 1.00 X volume of solution
=> volume of solution = 247.9 mL = 0.2479 L
Explanation:
h20 (s) -> h20 (g)
endothermic or exothermic
Answer:
Endothermic.
Explanation:
Hello there!
In this case, it is necessary to keep in mind that exothermic processes are characterized by the release of energy and the endothermic processes by the absorption of heat. In such a way, every process from solid to liquid or gas is endothermic as they require energy to separate the molecules and therefore turn out in the phase change. On the other hand, every process from gas to liquid or solid is exothermic as heat is released to rejoin the molecules and produce the phase change.
Therefore, since solid water molecules tend to be well-arranged, it is necessary to add heat to the system to produce the phase change until gas; in such a way, this process is endothermic as energy must be absorbed by the ice.
Best regards!
How many milliliters of 0.2560 M KCl solution will contain 20.00 g of KCl?
Answer is 1048 mL solution but how do I get to the answer?
Answer:
1048 mL
Explanation:
Step 1: Given data
Concentration of the solution: 0.2560 MMass of KCl (solute): 20.00 gStep 2: Calculate the moles corresponding to 20.00 g of KCl
The molar mass of KCl is 74.55 g/mol.
20.00 g × 1 mol/74.55 g = 0.2683 mol
Step 3: Calculate the volume of the solution
Molarity is equal to moles of solute divided by liters of solution.
M = moles of solute / volume of solution
volume of solution = moles of solute / M
volume of solution = 0.2683 mol / (0.2560 mol/L)
volume of solution = 1.048 L = 1048 mL
what are possible source of error for rusting of a nail
Answer:
A nail can rust when exposed to oxygen. the molecules of iron on the surface of the nail exchange atoms with the oxygen in the air and produce a new substance, the reddish brown ferrous oxide i.e rust.
Aqueous hydrochloric acid will react with solid sodium hydroxide to produce aqueous sodium chloride and liquid water . Suppose 1.5 g of hydrochloric acid is mixed with 2.67 g of sodium hydroxide. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to significant digits.
Answer: The maximum amount of water that can be produced is 0.74 g
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] .....(1)
Putting values in equation 1, we get:
[tex]\text{Moles of hydrochloric acid:}=\frac{1.5g}{36.5g/mol}=0.041mol[/tex]
[tex]\text{Moles of sodium hydroxide}=\frac{2.67g}{40g/mol}=0.067mol[/tex]
The chemical equation for the reaction is
[tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]
By Stoichiometry of the reaction:
1 mole of HCl reacts with 1 mole of NaOH
So, 0.041 moles of HCl will react with = [tex]\frac{1}{1}\times 0.041=0.041mol[/tex] of NaOH
As, given amount of NaOH is more than the required amount. So, it is considered as an excess reagent. Thus, HCl is considered as a limiting reagent because it limits the formation of product.
By Stoichiometry of the reaction:
1 mole of HCl produces = 1 mole of water
So, 0.041 moles of HCl will produce = [tex]\frac{1}{1}\times 0.041=0.041moles[/tex] of water
Mass of water=[tex]moles\times {\text{Molar Mass}}=0.041mol\times 18g/mol=0.74g[/tex]
Thus the maximum amount of water that can be produced is 0.74 g
Can somebody please help me!!!!
Answer and Explanation:
The answer is Motion.
We can see that part of the image is blurry, which shows that the fish are moving fast. Moving = motion, so that means the fish has motion.
#teamtrees #PAW (Plant And Water)
Answer:
motion
Explanation:
(b) the absolute temperature of the gas at which 3.33x103 mol occupies 478 mL at 750 torr,
Explanation:
T=?
Given
n=3.33×10³
V=478mL=4.78L
P=750torr= 0.987 Atm
simply use the formula
PV =nRT
where R is universal gas constant
0.987×4.78= 3.33×10³×8.314×T
T = 0.000170°c
T= 273.15 K!
The absolute temperature of the gas at which 3.33x10³ mol occupies 478 mL at 750 torr is 1.726 × 10-³K
HOW TO CALCULATE TEMPERATURE:
The temperature of a substance can be calculated using the ideal gas law equation as follows:PV = nRT
Where;
P = pressure (atm)V = volume (L)n = number of moles (mol) R = gas law constant (0.0821 molK/Latm)T = temperature (K)According to this question,
P = 750torr = 0.987 atmV = 478mL = 0.478L0.987 × 0.478 = 3.33 × 10³ × 0.0821 × T0.472 = 273.39TT = 0.472 ÷ 273.39T = 1.726 × 10-³KTherefore, the absolute temperature of the gas at which 3.33x10³ mol occupies 478 mL at 750 torr is 1.726 × 10-³KLearn more at: https://brainly.com/question/12124605?referrer=searchResults