The dissolution of ammonium nitrate in water is given by the following equation:

Question

NH4NO3(s) + heat → NH4+(aq) + NO3-(aq)

Which statement best describes what an energy graph of this reaction would look like?

(1 point)
Responses

The reactants and products would appear at a high energy state.
The reactants and products would appear at a high energy state.

The reactants would appear at a higher energy state than the products.
The reactants would appear at a higher energy state than the products.

The reactants and products would appear at a low energy state.
The reactants and products would appear at a low energy state.

The reactants would appear at a lower energy state than the products.Question
In the reaction of hydrogen gas and oxygen gas to form water, the glowing splint(1 point)
Responses

is one of the reactants of the reaction.
is one of the reactants of the reaction.

provides the kinetic energy for the reaction.
provides the kinetic energy for the reaction.

provides the activation energy for the reaction.
provides the activation energy for the reaction.

is one of the products of the reaction.The diagram represents the electrolysis of hydrochloric acid (HCl) to form hydrogen gas (H2) and chlorine gas (Cl2). Which statement best describes the reaction?

(1 point)
Responses

The formation of the products releases activation energy, and this energy is greater than the energy that is absorbed by the reactants.
The formation of the products releases activation energy, and this energy is greater than the energy that is absorbed by the reactants.

The formation of the products releases activation energy, and this energy is less than the energy that is absorbed by the reactants.
The formation of the products releases activation energy, and this energy is less than the energy that is absorbed by the reactants.

The formation of the products releases bond energy, and this energy is greater than the energy that is absorbed by the reactants.
The formation of the products releases bond energy, and this energy is greater than the energy that is absorbed by the reactants.

The formation of the products releases bond energy, and this energy is less than the energy that is absorbed by the reactants.Use the reaction to answer the question.

C2H4 + O2 → CO2 + H2O

How many bonds are broken when performing the reaction? How many bonds are formed?
(Reminder to check if the reaction is balanced)

(1 point)
Responses

Four C–H, one C=C, and one O=O bond need to break up. Two C=O and two O–H bonds need to form.
Four C–H, one C=C, and one O=O bond need to break up. Two C=O and two O–H bonds need to form.

Four C–H, one C–C, and three O–O bonds need to break up. Four C–O and four O–H bonds need to form.
Four C–H, one C–C, and three O–O bonds need to break up. Four C–O and four O–H bonds need to form.

Four C–H, one C–C, and one O–O bond need to break up. Two C–O and two O–H bonds need to form.
Four C–H, one C–C, and one O–O bond need to break up. Two C–O and two O–H bonds need to form.

Four C–H, one C=C, and three O=O bonds need to break up. Four C=O and four O–H bonds need to form.
Four C–H, one C=C, and three O=O bonds need to break up. Four C=O and four O–H bonds need to form.Which phrase defines bond energy?(1 point)
Responses

energy input needed to break reactant bonds
energy input needed to break reactant bonds

energy stored in chemical bonds
energy stored in chemical bonds

energy output when product bonds form
energy output when product bonds form

energy required to break a chemical bondCatalysts speed up chemical reactions. Which change is a likely direct effect of a catalyst?(1 point)
Responses

decreasing chemical potential energy
decreasing chemical potential energy

decreasing activation energy
decreasing activation energy

increasing chemical potential energy
increasing chemical potential energy

increasing activation energy

also put a b c or d

Answer 1

Here are the answers to your questions, including the letter options:

1. The dissolution of ammonium nitrate in water is given by the following equation:

   • Correct Answer: The reactants would appear at a higher energy state than the products. (b)

2. In the reaction of hydrogen gas and oxygen gas to form water, the glowing splint:

   • Correct Answer: provides the activation energy for the reaction. (c)

3. The diagram represents the electrolysis of hydrochloric acid (HCl) to form hydrogen gas (H2) and chlorine gas (Cl2). Which statement best describes the reaction?

   • Correct Answer: The formation of the products releases bond energy, and this energy is less than the energy that is absorbed by the reactants. (c)

4. Use the reaction to answer the question: C2H4 + O2 → CO2 + H2O (How many bonds are broken when performing the reaction? How many bonds are formed?)

   • Correct Answer: Four C–H, one C=C, and one O=O bond need to break up. Two C=O and two O–H bonds need to form. (a)

5. Which phrase defines bond energy?

   • Correct Answer: energy input needed to break reactant bonds (a).

6. Catalysts speed up chemical reactions. Which change is a likely direct effect of a catalyst?

   • Correct Answer: decreasing activation energy (b).

So the final answers are:

1. b
2. c
3. c
4. a
5. a
6. b