Answers
In the nineteenth and twentieth centuries, cast iron—also known as gray cast iron was a type of pipe that was utilized as a pressure pipe for the transfer of water and sewage.
Fertiliser :Any natural or manufactured product that is applied to soil or plant tissues to provide nutrients for plants (see spelling variations) is an example. It is possible to differentiate fertilizers from liming materials and other non-nutritious soil additives.
Rust :Iron oxide, a chemical that is used a lot, is known as rust. Iron's rapid interaction with oxygen results in the formation of iron oxide, or Fe₂O₃, which is so common that pure iron rarely occurs in nature.
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Related Questions
Write the acidic equilibrium equation for C₃H₇COOH. Be sure to include the proper phases for all species within the reaction.
Answers
Propionic acid, C3H7COOH, has an equation for its acidic equilibrium that looks like this: C₃H₇COOH (aq) + H₂O (l) ⇌ C₃H₇COO⁻ (aq) + H₃O⁺ (aq).
Which three equilibrium equations are there?A system must satisfy the three equations of equilibrium, Sum Fx = 0, Sum Fy = 0, and Sum M = 0, in order to be in equilibrium. Start with the equations for the sum of the forces. Dividing the diagonal forces into their component parts would be the most straightforward technique to solve these force systems.
What is an illustration of a reaction in equilibrium?The chemical reaction between the reactants both before and after the reaction is complete is referred to as an equilibrium reaction (i.e., a thermodynamic equilibrium state). The evaporation of water into vapor is an illustration of an equilibrium reaction.
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You have 2 sets of elements:
Set 1: fluorine, chlorine, and bromine (F, Cl, & Br)
Set 2: nitrogen, oxygen, and fluorine (N, O, & F)
Which of these two sets would you expect to be more similar in terms of properties? Explain why.
Answers
"Set 2 (N, O, & F) would be more similar in terms of properties.
This is because elements in the same group (column) of the periodic table generally have similar properties due to their similar electron configurations. Fluorine (F) is in Group 17 (the halogens) of the periodic table, and chlorine (Cl) and bromine (Br) are also halogens, which means they have similar properties such as being highly reactive and forming acidic compounds.
Nitrogen (N), oxygen (O), and fluorine (F) are all located in Group 16 (the chalcogens) and Group 17 (the halogens) of the periodic table, respectively. While nitrogen is not a halogen, it is located just above Group 17, and oxygen and fluorine are halogens. Elements in Group 16 and 17 share similar chemical properties such as high electronegativity and the tendency to form covalent bonds.
Therefore, because elements in the same group of the periodic table have similar properties, we would expect Set 2 to be more similar in terms of properties than Set 1. Specifically, nitrogen, oxygen, and fluorine are all nonmetals with relatively high electronegativities and the ability to form strong covalent bonds, which makes them more similar to each other than to the halogens in Set 1" (ChatGPT, 2023)
The identity of an unknown monoprotic organic acid is determined by titration. A 0.148 g sample of the acid is titrated with 0.159 M NaOH. What is the molar mass of the compound if 12.6 mL of the NaOH solution is required to neutralize the sample?
Answers
The molar mass of the unknown compound in 12.6 mL of NaOH solution is 74 g/mol.
First, we need to find the number of moles of NaOH used in titration
moles of NaOH = concentration x volume in liters
moles of NaOH = 0.159 mol/L x (12.6/1000) L
moles of NaOH = 0.0020014 mol
Since the acid is monoprotic, the number of moles of the acid is also 0.0020014 mol.
Now let us calculate its molar mass
molar mass = mass / moles
molar mass = 0.148 g / 0.0020014 mol
molar mass = 73.9 g/mol
Therefore, the molar mass of the unknown monoprotic organic acid is 73.9 g/mol.
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To determine the molar mass of the unknown monoprotic organic acid, we need to use the information provided. We are given that 0.148 g of the acid is titrated with 0.159 M NaOH and it takes 12.6 mL of the NaOH solution to neutralize the sample. The molar mass of the compound is approximately 73.8 g/mol.
Explanation:To determine the molar mass of the unknown monoprotic organic acid, we need to use the information provided. We are given that 0.148 g of the acid is titrated with 0.159 M NaOH and it takes 12.6 mL of the NaOH solution to neutralize the sample. First, we need to calculate the moles of NaOH used by multiplying its molarity by its volume in liters:
Moles of NaOH = concentration * volume = 0.159 M * 0.0126 L = 0.0020046 moles
Since the acid is monoprotic (meaning it donates only one hydrogen ion), the number of moles of the acid is equal to the number of moles of NaOH used. Now, we can calculate the molar mass of the acid by dividing the mass of the acid by the moles:
Molar mass of acid = mass of acid / moles of acid = 0.148 g / 0.0020046 moles ≈ 73.8 g/mol
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1
1. A neutral atom of an element has 2 electrons in the first energy level, 8 in the second energy level and 8 in the third energy level. This information does not necessarily tell us:
(a) the atomic number of the element.
(b) anything about the element's chemical properties.
(c) the total number of electrons in s orbitals.
(d) the total number of electrons in p orbitals.
(e) the number of neutrons in the nucleus of an atom of the element
Answers
Answer: (e) the number of neutrons in the nucleus of an atom of the element
Explanation: The given information tells us how many electrons the atom has, and since the atom is neutral then the atomic number is the same as the total number of electrons. This rules out answer a. It also tells us that the element has a full set of valence electrons, making it a noble gas and ruling out answer b because noble gasses are known to act differently to other elements. c is ruled out because we are given the number of electrons, allowing us to figure out how many electrons are in s orbitals. The same goes for option d. This leaves option e. e is the correct answer because the number of neutrons in the nucleus of an atom does not affect the number of electrons or the charge of the atom, meaning we have no way of finding it.
The wind blows a lawn chair that weighs 4 kg into a fence with a force of 8 N. How much reaction force does the fence exert on the chair.
A. 2N
B. 0.5 N
C. 0 N
D.8 N
Answers
Since the lawn chair weighs 4 kg, its weight is:
weight = mass × gravitational acceleration = 4 kg × 9.81 m/s^2 = 39.24 N
The force exerted on the lawn chair by the wind is 8 N. Since the lawn chair is not accelerating vertically (it is not lifted off the ground), the vertical forces on the lawn chair must be balanced. This means that the force of the fence pushing up on the lawn chair must be equal in magnitude and opposite in direction to the weight of the lawn chair.
Therefore, the reaction force that the fence exerts on the chair is:
reaction force = weight of the chair - force of the wind = 39.24 N - 8 N = 31.24 N
So the correct answer is not given in the options. The closest answer is D. 8 N, which is the force of the wind on the chair, but this is not the reaction force exerted by the fence on the chair.
calculate the number molecules of water present in a snowball that weighs 360 grams
Answers
360 g of water is equal to 1.20441025 molecules and 20 moles.[tex]1.2 * 10^2^4[/tex]molecules make up 36g of water.
How do you measure 250ml of water?8.45 fluid ounces, or just over 1 cup, of water are equal to 250 millilitres of water. This is because 250 millilitres would be little more than 1 cup as 1 cup is approximately 236 millilitres.
How are water molecules calculated?We may determine the atomic weights of the elements using their periodic tables, and we discover that hydrogen has an atomic weight of 1, while that of oxygen is 16. We sum the contributions from each atom to determine the molecular weight of one water molecule, which is 2(1) + 1(16) = 18 grams/mole.
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I want to make a precipitate from C4 H6 O4Sr and K3 PO4. Is this possible and if so, how do I do this?
Answers
To make the precipitate, you will need to mix solutions of the two compounds together. The easiest way to do this is to dissolve each compound in water separately, and then mix the solutions together.
Here are the steps to follow:
1. Dissolve 1 mole of C4H6O4Sr in 1 liter of water. This will result in a 1 M solution of C4H6O4Sr.
2. Dissolve 1 mole of K3PO4 in 1 liter of water. This will result in a 1 M solution of K3PO4.
3. Mix the two solutions together in a container that will allow you to observe the formation of the precipitate.
4. You should begin to see the formation of a white, cloudy precipitate as the two solutions mix. This is the strontium phosphate.
5. Mix the contents of the container thoroughly and allow it to sit for several minutes to ensure that the reaction is complete.
6. You can then separate the precipitate from the remaining solution using any method that works for you, such as filtration or centrifugation.
Which of the following is true for the quantum mechanical atomic model?
A. Atoms absorb or emit electrons from the nucleus when they interact with electromagnetic radiation.
B. Every atom absorbs all wavelengths of light energy or electromagnetic radiation.
C. Electrons give off electromagnetic radiation when they jump from a high to a low energy level.
D. Electrons are perfectly evenly distributed throughout the atom.
Answers
Answer: C. Electrons give off electromagnetic radiation when they jump from a high to a low energy level.
Explanation:
Electrons give off electromagnetic radiation when they jump from a high to a low energy level in the quantum mechanical atomic model. This is known as the emission spectrum of an atom, and each element has its unique emission spectrum. This phenomenon was explained by the Bohr model of the atom and is a fundamental concept of the quantum mechanical atomic model.
Option A is incorrect because atoms cannot absorb or emit electrons from the nucleus when they interact with electromagnetic radiation. Option B is also incorrect because atoms only absorb certain wavelengths of light energy or electromagnetic radiation, which corresponds to the energy difference between electron energy levels. Option D is incorrect because electrons are not evenly distributed throughout the atom in the quantum mechanical atomic model; instead, they occupy specific energy levels or orbitals.
If you combine 440.0 mL of water at 25.00 ∘C and 130.0 mL of water at 95.00 ∘C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.
final= ∘C
Answers
The final temperature of the mixture is 41.9. Mass has an impact on how much heat it can receive.
How to calculate final temperature?The mean of the two temperatures is referred to as the ultimate temperature when a mixture contains the same substance with the same mass. The quantity of heat necessary to raise the temperature of one gramme of a substance by one degree is known as a substance's specific heat.
The final heat of your substance can be calculated by adding the temperature difference to the starting point. Keep in mind that each object's mass.
mass has an impact on how much heat it can receive.
q = mCT
440 - 11,000 = 13,300 - 140 final temperature
580 = 24,300
final temperature = 41.9 C
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4.16 g of element W reacts with 1.92 g of oxygen to form metal oxide W. The
empirical formula for this metal oxide is W203. What is the relative atomic mass of
W?
[Relative atomic mass : 0 = 16]
A 27
B 52
C 56
D 104
Answers
Answer:
52 grams (B)
Explanation:
Given: 4.16 grams of W
1.92 grams of O2
The reaction:
2W + 1.5 O2 ----> W2O3
We are gonna calculate the molar mass of W with ratios
So, to calculate that, we will multiply the moles by molar masses (O2: 1.5 * 32 & W: 2x) and divide the over the given masses and equating both fractions:
[tex]\frac{2x}{4.16} = \frac{1.5*32}{1.92}[/tex]
[tex]x = \frac{1.5*32*4.16}{2*1.92} = 52 grams[/tex]
Choose the formula for the compound tribromide decaoxide.
Choose the formula for the compound trinitrogen octachloride.
Choose the formula for the compound octaselenium heptaoxide.
Choose the formula for the compound disilicon nonachloride.
Choose the formula for the compound nitrogen monofluoride.
Choose the formula for the compound carbon tetrachloride.
Answers
The formulas for the given compounds are:
Tribromide decaoxide: Br₃O₁₀Trinitrogen octachloride: N₃Cl₈Octaselenium heptaoxide: Se₈O₇Disilicon nonachloride: Si₂Cl₉Nitrogen monofluoride: NFCarbon tetrachloride: CCl₄What is the formula of a compound?A chemical formula is a representation of the chemical composition of a substance using symbols for the elements and numerical subscripts to indicate the number of atoms of each element present in a molecule or an ionic compound. It is a shorthand way of describing the identity and ratio of the elements in a substance.
The formula for a compound indicates the type and number of atoms in the simplest unit of the substance.
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What is The oxidation half reaction for F^- + CLO3^- ==> F2 + CL^-
Reactants -> Products
Answers
The oxidation half reaction is;
2F^-(aq) ----> F2 (g) + 2e. This is an oxidation because there is the loss of two electrons.
What is oxidation half reaction?An oxidation half-reaction is a chemical reaction that involves the loss of electrons by an atom, ion, or molecule. In other words, it is a reaction where a substance undergoes oxidation by losing one or more electrons.
We can see that in the oxidation half equation that have been shown there can be seen to be the loos of about two electrons in the half equation;
2F^-(aq) ----> F2 (g) + 2e
Hence, this is the oxidation half equation.
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how much ice can be melted with 560 joules of heat?
Answers
The amount of ice that can be melted by a given amount of heat depends on several factors, such as the mass of the ice, the specific heat capacity of ice, and the heat of fusion of ice (the amount of heat required to melt a given mass of ice at its melting point).
Assuming that the ice is at its melting point (0°C or 32°F) and that the heat is used solely to melt the ice (not to raise its temperature), we can use the heat of fusion of ice and the equation:
Q = m * L
where Q is the heat required to melt the ice, m is the mass of the ice, and L is the heat of fusion of ice (334 J/g).
To find the mass of ice that can be melted with 560 J of heat, we can rearrange the equation to solve for m:
m = Q / L
m = 560 J / 334 J/g
m = 1.67 g
Therefore, 560 joules of heat can melt 1.67 grams of ice at its melting point.
Answer:
The amount of ice that can be melted with a certain amount of heat depends on several factors such as the mass of the ice, the initial temperature of the ice, and the specific heat capacity of ice.
However, assuming we are dealing with a certain amount of ice with a specific mass and initial temperature, we can use the following formula:
Q = m × Lf
where Q is the amount of heat required to melt the ice, m is the mass of the ice, and Lf is the heat of fusion of ice, which is equal to 334 joules/gram.
To find the amount of ice that can be melted with 560 joules of heat, we need to rearrange the formula as:
m = Q ÷ Lf
Plugging in the values, we get:
m = 560 J ÷ 334 J/g ≈ 1.67 g
Therefore, 560 joules of heat can melt approximately 1.67 grams of ice.
12. The molecules in a material need to move with more energy for the material to change from a
A. liquid to a gas.
B. gas to a liquid.
C. liquid to a solid.
D. gas to a solid.
Answers
Answer:
A) liquid to a gas
Explanation:
When molecular motion increases, the space between molecules increases, and when it decreases, the space between molecules decreases. It requires energy for a solid to melt into a liquid, and once a liquid is changing state to a gas, potential energy is increasing during that phase change.
Liquid octane CH3CH26CH3 reacts with gaseous oxygen gas O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. If 29.2g of carbon dioxide is produced from the reaction of 20.6g of octane and 98.6g of oxygen gas, calculate the percent yield of carbon dioxide. Round your answer to 3 significant figures.
Answers
Now, we can calculate the percent yield of carbon dioxide using the following equation Percent yield of CO2 = 61.5% .
What is carbon dioxide?Carbon dioxide (CO2) is a colorless, odorless gas composed of one carbon atom and two oxygen atoms. It exists in the Earth's atmosphere as a trace gas, making up approximately 0.04% of the atmosphere by volume. In nature, it is produced by the respiration of living organisms and through the decay of organic matter. It is also a byproduct of many human activities such as burning fossil fuels, producing cement, and manufacturing plastic. Carbon dioxide is an important greenhouse gas, which means it absorbs and traps heat in the atmosphere, resulting in global warming.
The given reaction is:
CH3CH2CH3 + O2 → CO2 + H2O
Given:
m(octane) = 20.6 g
m(O2) = 98.6 g
m(CO2) = 29.2 g
Using the given information and the balanced equation, we can determine the theoretical yield of carbon dioxide by using the following equation:
m(CO2) (theoretical) = (m(octane) × molar mass of octane) / molar mass of CO2
m(CO2) (theoretical) = (20.6 g × 72 g/mol) / 44 g/mol
m(CO2) (theoretical) = 47.45 g
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How many atoms of oxygen are present in 200.0 g of CaCO3 ?
Answers
Explanation:
firstly we find the mole of CaCO3 . Now, in CaCO3 1 mol CaCO3 contains 3 mol O . Hence, 36.138*10^23 atoms of oxygen are present in 200 g of caco3.
Strong acids and bases have minimal effects on pH, while weak acids and bases can have a large impact on pH.
True or False
Answers
Stronger acids have lower pH values than weaker acids because they have more ions in solution. As a result, the statement "A strong acid solution always has a lower pH than a mild acid solution" is accurate.
Can a weak acid's pH ever be lower than a strong acid's?A weak acid should have a pH of less than 7 (not neutral), and its pH is often lower than that of a strong acid. Note that there are a few.
Does the pH of strong bases change?Strong bases and strong acids do not hydrolyze the salts they produce. The pH will stay at 7 and be neutral.
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Provide the equation for the hydrolysis of propyl propanoate. Provide the equation for the hydrolysis N, N-dimethyl propanamide.
IF POSSIBLE MUST BE DONE ASAP.
Answers
Answer:
The hydrolysis reaction of propyl propanoate is as follows:
Propyl propanoate + Water → Propanoic acid + Propanol
The balanced chemical equation for this reaction is:
CH3CH2COOCH2CH2CH3 + H2O → CH3CH2COOH + CH3CH2CH2OH
The hydrolysis reaction of N, N-dimethyl propanamide is as follows:
N, N-dimethyl propanamide + Water → Propanoic acid + Dimethylamine
The balanced chemical equation for this reaction is:
CH3CH2CON(CH3)2 + H2O → CH3CH2COOH + (CH3)2NH
How many grams are there in 6 moles of water??
Answers
Answer:108.06 grams
Explanation: the first step is to use unit conversions. Multiply the given number of moles by the molar mass of water which is 15.99 grams of oxygen plus 2.02 grams for two hydrogen that will turn it into grams and that will give you your total number of grams.
Alcohol is less dense than water. If you measured the mass of the same volume of alcohol and water
Answers
If you measured the mass of the same volume of alcohol and water, alcohol will weigh less than water.
Density and weightsIf you measured the mass of the same volume of alcohol and water, you would find that alcohol has a lower mass than water.
This is because alcohol is less dense than water, which means that a given volume of alcohol weighs less than the same volume of water.
For example, if you measure 1 liter of water and 1 liter of alcohol, you will find that the mass of the water is greater than the mass of the alcohol.
This is because water has a higher density than alcohol. The density of water is about 1 gram per cubic centimeter, while the density of alcohol is about 0.79 grams per cubic centimeter. Therefore, the mass of the same volume of alcohol is lower than the mass of water.
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Explain how matter relates to life
Answers
Answer:
matter are anything that has space
Which of the following represents the greatest pressure?
O 0.625 atm
O 755 mmHg
O 15.10 PSI
O 90,250 Pa
Answers
The highest pressure, or 1.04 atm, or 15.10 PSI, is present.
What pressure level in Pa is high pressure?High pressure is often characterized by a barometer measurement of over 30.20 inHg and is linked to calm, clear skies. Above 30.20 inHg (102268.9 Pa or 1022.689 mb) indicates rising or stable pressure, which indicates continuous pleasant weather. Fair weather is a sign of slowly decreasing pressure.
0.625 atm
755 mmHg = 1 atm (by definition)
15.10 PSI = 1.04 atm (1 PSI = 0.068 atm)
90,250 Pa = 0.89 atm (1 Pa = 9.87x10^-6 atm)
Therefore, the greatest pressure is 1.04 atm, which corresponds to 15.10 PSI.
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Zn + 2HCl → ZnCl2 + H2
How many moles of hydrogen are produced from the reaction of 2.3 moles of zinc?
Answers
Answer:
3 moles
Explanation:
Based on the balanced chemical equation, 1 mole of H2 is formed when 1 mole of Zn reacts with excess HCl. As such, 3 moles of H2 are formed when 3 moles of Zn react with excess HCl.
Neurological differences in singing
alone or with others
Alone on the left, and with others on the right. Welsh, 2015.
Which of the following conclusions can be drawn from the brain scan images?
SOBRE
Singing alone is less fun than singing with others.
Singing with others activates more regions of the brain.
Singing alone activates more regions of the brain.
Singing alone is a requirement of singing with others.
Which of the following is evident in the brain scans?
0000
There is no difference in brain activity when singing alone or singing with others.
Singing with others is an important task.
Singing alone and singing with others activate different parts of the brain.
Loud music activates the most parts of the brain.?
Answers
1) Singing alone is less fun than singing with others
2) Loud music activates the most parts of the brain
Can a brain scan during singing show important information?Brain scans during singing can provide important information about the neural processes involved in music and vocalization.
Brain scans during singing can help researchers understand how these different brain regions interact and coordinate during vocalization. For example, studies have shown that professional singers have greater activation in the motor cortex and auditory cortex compared to non-singers, suggesting that extensive training can lead to changes in the brain's neural circuits.
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You complete an experiment measuring the spread of the Cordyceps fungus across a forest environment. You measure the amount of growths you observe on the ground in a 1 acre area. After evaluating your experiment, you find that fungus frequently grows long fibers underground and only sprout reproductive parts above ground. How might this affect your data and/or conclusion?
Answers
The experiment's initial result was incorrect since the statistics do not account for subsurface growth, which may have expanded over a greater area.
What is a straightforward experiment?Researchers frequently employ a straightforward experiment to establish cause-and-effect, or to ascertain if modifications to one factor might result in changes in another one.
What experiments carry out chemists?At the molecular and atomic levels, chemists examine the properties of materials. They quantify amounts and reaction rates in hopes of understanding unfamiliar compounds and how they function. When creating new chemicals for application in a variety of real-world situations, they may additionally measure these parameters.
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The acid-dissociation constant, Ka, for benzoic acid is 6.5 × 10-5. Which will you use to calculate the base-dissociation constant, Kb, for the conjugate base of benzoic acid?
Answers
Therefore, the value we will use to calculate the base-dissociation constant, Kb, for the conjugate base of benzoic acid is 1.54 × 10⁻¹⁰.
What is base-dissociation constant?The base dissociation constant, Kb, is a measure of the strength of a base in solution. It is the equilibrium constant for the reaction of a base with water to form the conjugate acid and hydroxide ion: B + H2O ⇌ BH+ + OH-. The Kb value is calculated by dividing the equilibrium constant for this reaction by the concentration of the conjugate acid and the concentration of hydroxide ion at equilibrium. Kb = [BH+][OH-] / [B] The Kb value can range from very small values (for weak bases) to very large values (for strong bases). The larger the value of Kb, the stronger the base. The Kb value is related to the acid-dissociation constant, Ka, for the conjugate acid of the base by the following relationship:
Kw = Ka × Kb
The Kb value is an important parameter in acid-base chemistry and is used to predict the degree of base ionization in solution, to calculate pH of basic solutions, and to determine the strength of bases in organic chemistry.
Here,
To calculate the base-dissociation constant, Kb, for the conjugate base of benzoic acid, we need to use the relationship between the acid-dissociation constant, Ka, and the base-dissociation constant, Kb, for a conjugate acid-base pair. The relationship is given by the following equation:
Ka × Kb = Kw
where Kw is the ion product constant for water, which is equal to 1.0 × 10⁻¹⁴ at 25°C.
Since we know the value of Ka for benzoic acid, which is 6.5 × 10^-5, we can use this equation to calculate the value of Kb for the conjugate base of benzoic acid:
Ka × Kb = Kw
Kb = Kw / Ka
Kb = 1.0 × 10⁻¹⁴ / 6.5 × 10⁻⁵
Kb = 1.54 × 10⁻¹⁰
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Balance each of the following equations by writing the correct coefficient on the line.
A blank line = 1 or you can put in the 1 that is fine.
look at photo for reference
Answers
All I know about here..
How do you balance an equation with a coefficient?
Steps in Balancing a Chemical Equation
Count each type of atom in reactants and products. ...
Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances. ...
Repeat steps 1 and 2 until the equation is balanced.
I need help with each one can you please show work
Answers
Answer:
1. 0.121 moles
2. 46.9 liters
3. 12.3 atm
4. 253 K
5. 0.552 g/L.
6. 22.8 g/mol.
7. 0.0494 moles
8. 5370 liters
9. 34.5 grams
10. helium
Explanation:
1. Using the ideal gas law equation, we can solve for the number of moles of oxygen:
PV = nRT
n = PV/RT
n = (1.2 atm) * (2.5 L) / [(0.0821 L atm/mol⚫K) * (298 K)]
n = 0.121 moles of oxygen
Therefore, 0.121 moles of oxygen will occupy a volume of 2.5 liters at 1.2 atm and 25°C.
2. Using the ideal gas law equation, we can solve for the volume of nitrogen:
PV = nRT
V = nRT/P
V = (2.0 moles) * (0.0821 L atm/mol⚫K) * (293 K) / (720 Torr)
V = 46.9 L
Therefore, 2.0 moles of nitrogen will occupy a volume of 46.9 liters at 720 Torr and 20°C.
3. Using the ideal gas law equation, we can solve for the pressure of CO:
PV = nRT
P = nRT/V
n = (25 g) / (28.01 g/mol) = 0.892 mol
P = (0.892 mol) * (0.0821 L atm/mol⚫K) * (298 K) / (0.5 L)
P = 12.3 atm
Therefore, 25 g of CO will exert a pressure of 12.3 atm at a temperature of 25°C and a volume of 500 mL.
4. Using the ideal gas law equation, we can solve for the temperature of Cl:
PV = nRT
T = PV/nR
n = (5.00 g) / (35.45 g/mol) = 0.141 mol
T = (900. Torr) * (0.750 L) / (0.141 mol) / (0.0821 L atm/mol⚫K)
T = 253 K
5. Therefore, 5.00 g of Cl will exert a pressure of 900. Torr at a volume of 750 mL at a temperature of 253 K.
Using the ideal gas law equation, we can solve for the density of NH3:
PV = nRT
n/V = P/RT
n/V = (800 Torr) / [(0.0821 L atm/mol⚫K) * (298 K)]
n/V = 0.0324 mol/L
The molar mass of NH3 is 17.03 g/mol, so the density of NH3 is:
density = (0.0324 mol/L) * (17.03 g/mol) = 0.552 g/L
Therefore, the density of NH3 at 800 Torr and 25°C is 0.552 g/L.
6. We can use the ideal gas law to calculate the number of moles of the gas and then divide the mass of the gas by the number of moles to get the molecular mass.
PV = nRT
n = PV/RT
n = (1.2 g/L) / [(0.0821 L atm/mol⚫K) * (293 K) * (745. Torr / 760 Torr)]
n = 0.0526 mol
The mass of the gas is 1.2 g, so the molecular mass is:
molecular mass = 1.2 g / 0.0526 mol = 22.8 g/mol
Therefore, the molecular mass of the gas is 22.8 g/mol.
7. Using the ideal gas law equation, we can solve for the number of moles of nitrogen gas:
PV = nRT
n = PV/RT
n = (6680 Torr) * (0.347 L) / [(0.0821 L atm/mol⚫K) * (300 K)]
n = 0.0494 moles of nitrogen gas
Therefore, 0.0494 moles of nitrogen gas will occupy a volume of 347 mL at 6680 Torr and 27°C.
8. We can use the ideal gas law to calculate the volume of hydrogen:
PV = nRT
V = nRT/P
n = (454 g) / (2.016 g/mol) = 225 mol
V = (225 mol) * (0.0821 L atm/mol⚫K) * (298 K) / (1.05 atm)
V = 5370 L
Therefore, 454 grams (1 lb.) of hydrogen will occupy a volume of 5370 liters at 1.05 atm and 25°C.
9. Using the ideal gas law equation, we can solve for the number of moles of CO:
PV = nRT
n = PV/RT
n = (785 Torr) * (32.5 L) / [(0.0821 L atm/mol⚫K) * (305 K)]
n = 1.23 moles of CO
The molar mass of CO is 28.01 g/mol, so the mass of CO is:
mass = (1.23 moles) * (28.01 g/mol) = 34.5 g
10. Therefore, 34.5 grams of CO will exert a pressure of 785 Torr at a volume of 32.5 L and a temperature of 32°C.
Using the ideal gas law equation, we can solve for the identity of the gas:
PV = nRT
n = PV/RT
n = (758 Torr) * (58.4 L) / [(0.0821 L atm/mol⚫K) * (275.5 K)]
n = 2.93 moles of gas
The mass of the gas is 10.3 g, so the molecular mass is:
molecular mass = 10.3 g / 2.93 mol = 3.52 g/mol
Looking at the periodic table, we see that the only element with a molecular mass close to 3.52 g/mol is helium, which has a molecular mass of 4.00 g/mol. Therefore, the gas is likely helium.
What is occurring in section D?
heating curve phase changes
A. Particles of a gas are condensing into a solid.
B. Temperature of a gas is decreasing.
C. Temperature of a liquid is rising.
D. Particles of a gas are condensing into a liquid
Answers
Answer:
B. Temperature of a gas is decreasing.
C. Temperature of a liquid is rising.
D. Particles of a gas are condensing into a liquid
Explanation:
Simply, the diagram shows physical changes of a substance.
- Region A: we see the substance is very compacted with very closely attached molecules which characterizes solids.
Transition A—C (Region B):
[tex]{ \red{ \dashrightarrow{ \rm{ \: melting}}}} \\ { \blue{ \dashleftarrow{ \rm{ freezing}}}}[/tex]
From A to C, a solid is changing to liquid state by melting down and the reverse process is freezing.
Melting may be cause by increasing pressure and increasing the temperature of the substance. And freezing is the opposite.
- Region C: We see the substance has molecule further apart than in A. This characterizes liquid feature.
Transition C—E (Region D):
[tex]{ \red{ \dashrightarrow{ \rm{ \: evaporation}}}} \: \\ { \blue{ \dashleftarrow{ \rm{ condensation}}}}[/tex]
From C to E, liquid is changing to gaseous state by evaporation down and the reverse process is condensation. Evaporation occurs due to increase in pressure and temperature of the liquid, and condensation is the opposite.
- Region D
The molecules are furthest apart. This characterizes gaseous feature.
Note that also E can change to A and vice versa directly by sublimation.
Question 2 (10 points)
A hypothetical bird species is purple due to a purple pigment in their feathers. A random mutation in the gene that codes for the purple pigment protein results in one individual white bird.
A
Explain the connection between genes, proteins and traits using this example. Make sure you explain each step. What is the name of the dogma that explains this connection?
Answers
Answer:
Genes are segments of DNA that contain instructions for the production of specific proteins. Proteins are the molecules that perform various functions in cells and organisms, such as providing structural support, transporting molecules, and catalyzing chemical reactions.
In the case of the hypothetical bird species, the gene that codes for the purple pigment protein is responsible for producing the purple pigment in the bird's feathers. When a random mutation occurs in this gene, it can affect the production of the pigment protein. In the case of the white bird, the mutation likely results in a non-functional protein that cannot produce the purple pigment, resulting in white feathers.
This process of genes producing proteins, which in turn determine the traits of an organism, is known as the central dogma of molecular biology. The central dogma states that genetic information flows from DNA to RNA to protein, and that the sequence of nucleotides in DNA determines the sequence of amino acids in proteins, which in turn determine the structure and function of the protein and ultimately the traits of the organism.
Explanation: