Given the equation representing a closed system:N2O4(g) <=> 2NO2(g)Which statement describes this system at equilibrium?
(1) The volume of the NO2(g) is greater than the volume of the N2O4(g)
(2) The volume of the NO2(g) is less than the volume of the N2O4(g)
(3) The rate of the forward reaction and the rate of the reverse reaction are equal
(4) The rate of the forward reaction and the rate of the reverse reaction are unequal

Answers

Answer 1

Answer:

Answer: The correct option is (3).

Explanation:

$N_2O_4(g)\rightleftharpoons 2NO_2(g)$

An equilibrium in a reversible chemical reaction is a state in which concentration of reactants and products do not change with time. At equilibrium the rate of forward reaction is equal to the rate of backward reaction.

So, from the given statements the correct statement describing the given system at equilibrium is statement numbered '3'

Answer 2

Answer: 3., the equation is balanced so the forward and reverse reactions are equal

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15) Circle one and tell whya. CH3COOH is a n) (acid, base, salt)b. NH4Cl is a(n) (acid, base, salt)c. KOH is a(n) (acid, base, salt)d. H3PO4 is a(n) (acid, base, salt)e. CaBr2 is a(n) (acid, base, salt)

Answers

The answers to the given questions are:

a. CH3COOH = acid
b. NH4Cl = salt
c. KOH = base
d. H3PO4 = acid
e. CaBr2 = salt

Reasons:

a. This compound is also known as acetic acid, the acid found in vinegar. It can be observed that the compound has a hydrogen ion which makes the compound acidic.

b. Ammonium chloride is a salt because it is the product of an acid (hydrochloric acid, HCl) and base (ammonium hydroxide, NH4OH)

c. Potassium hydroxide is a base because of the presence of OH ion

d. Phosphoric acid is a base because it has 3 hydrogen ions that contributes to its acidity

Answer:

C) CH3COOH Is the answer you are looking for

Explanation:

This one makes the most sense and the other ones don't fit in with the acids they aren't Acidic those are either bases or neutrals! :)

Hope this helps! :)

Which organic compound is not only responsible for energy storage, but also can provide thermal insulation? A. lipids B. proteins C. nucleic acids D. carbohydrates E. monosaccharides

Answers

Answer: A. lipids

Explanation:

Lipids are responsible for energy storage. They can also provide thermal insulation in mammals and help them stay warm

Which subatomic particles are located in the nucleus of a carbon atom?(1) protons, only
(2) neutrons, only
(3) protons and neutrons
(4) protons and electrons

Answers

The nucleus of an atom houses the Neutrons and Protons.

You may recall that the products of the complete combustion of ahydrocarbon are water vapor and carbon dioxide gas. Write the balanced
equation showing the combustion of methane. Do not forget to include the
states of matter of the reactants and the products. Hint: Methane is a gas at
standard temperature and pressure.

Answers

Answer: $CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(g)$

Explanation: According to law of conservation of mass, mass can neither be created nor be destroyed.

Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

This is an example of combustion reaction in which hydrocarbon reacts with oxygen to form carbon dioxide and water. This is an exothermic reaction in which a large amount of heat is liberated, thus water also exists as vapors.

$CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(g)$

CH4 + 2O2 --> CO2 + 2H2O

Hunter wants to measure the weight of a dumbbell.he should A. use a beaker with water and record the weight in N.
B. use a scale and record the weight in CM.
C.use a beaker with water and record the weight in CM.
D. use a scale and record the weight in N.

Answers

He should use a scale and record the weight in N. The beaker is used for liquid measurement and the scale is used for measuring sold things. A dumbbell is not a liquid material that is why the need of the scale will give it the accurate measurement that Hunter wants to know.

Answer:

use a scale and record the weight in N.

Explanation:

What is the volume of 2 mol of chlorine gas at STP?

Answers

Answer:

Volume of 2 mol of chlorine gas at STP is 44.8 L

Explanation:

Let us assume chlorine gas behaves ideally.

According to law of ideal gas- PV=nRT

where P is pressure of gas, V is volume of gas, n is number of moles of gas, R is gas constant and T is temperature in Kelvin.

At STP, P is 1 atm and T is 273 K

Here n=2 and R=0.082 L.atm/mol.K

So $V=(nRT)/(P)=(2* 0.082* 273)/(1)L=44.8 L$

Hence volume of chlorine gas at STP is 44.8 L

The conversion factor for volume at STP is $\frac {1mol}{22.4L}$ or \frac {22.4L}{1mol}. Since we want volume, we would use \frac {22.4L}{1mol}. We conclude with the following calculations:

$2molCl_(2)*\frac {22.4LCl_(2)}{1molCl_(2)} = 44.8L Cl_(2)$

The answer is 44.8L Cl2

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An acid-base indicator is used in what type of reaction? A. neutralization B. combination C. decomposition D. combustion

What can be concluded if an ion of an element is smaller than an atom of the same element?(1) The ion is negatively charged because it has fewer electrons than the atom.(2) The ion is negatively charged because it has more electrons than the atom.(3) The ion is positively charged because it has fewer electrons than the atom.(4) The ion is positively charged because it has more electrons than the atom.

Which formulas represent two polar molecules?(1) CO2 and HCl (3) H2O and HCl (2) CO2 and CH4 (4) H2O and CH4