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

Question

(1 point)
Responses

is one of the products of the reaction.
is one of the products of the reaction.

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

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

provides the kinetic energy for the reactions.
provides the kinetic energy for the reactions.
Question 8

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 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.
The formation of the products releases bond 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 activation energy, and this energy is less than the energy that is absorbed by the reactants.
Question 9
(1 point)
Responses

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

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

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

Four C-H bonds, one C=C bond, and three O-O bonds need to break up. Four C-O bonds and four O-H bonds need to form.
Four C-H bonds, one C=C bond, and three O-O bonds need to break up. Four C-O bonds and four O-H bonds need to form.
Question 10
Which phrase defines bond energy?(1 point)
Responses

energy stored in chemical bonds
energy stored in chemical bonds

energy required to break a chemical bond
energy required to break a chemical bond

energy output needed to break reactant bonds
energy output needed to break reactant bonds

energy output when product bonds form
energy output when product bonds form
Question 11
Catalysts speed up chemical reactions. Which change is likely a direct effect of a catalyst?(1 point)
Responses

decreasing chemical potential energy
decreasing chemical potential energy

decreasing activation energy
decreasing activation energy

increasing activation energy
increasing activation energy

increasing chemical potential energy
increasing chemical potential energy
Question 12

Is the process of water evaporating endothermic or exothermic?

(1 point)
Responses

It is exothermic because as the liquid water changes into water vapor, it releases heat into the air.
It is exothermic because as the liquid water changes into water vapor, it releases heat into the air.

It is endothermic because heat from the surroundings has to be absorbed by the water in order to change states.
It is endothermic because heat from the surroundings has to be absorbed by the water in order to change states.

It is exothermic because heat from the surroundings has to be absorbed by the water in order to change states.
It is exothermic because heat from the surroundings has to be absorbed by the water in order to change states.

It is endothermic because as the liquid water changes into water vapor, it releases heat into the air.
It is endothermic because as the liquid water changes into water vapor, it releases heat into the air.
Question 13
A burner in a gas stove breaks propane and oxygen up to form carbon dioxide and water, thereby heating a home. Which part is the source of the activation energy required, and is this reaction endothermic or exothermic?(1 point)
Responses

The flame from the burner provides the energy to perform the reaction. The reaction is exothermic.
The flame from the burner provides the energy to perform the reaction. The reaction is exothermic .

The burning propane gas provides the energy to perform the reaction. The reaction is endothermic.
The burning propane gas provides the energy to perform the reaction. The reaction is endothermic .

The flame from the burner provides the energy to perform the reaction. The reaction is endothermic.
The flame from the burner provides the energy to perform the reaction. The reaction is endothermic .

The burning propane gas provides the energy to perform the reaction. The reaction is exothermic.
The burning propane gas provides the energy to perform the reaction. The reaction is exothermic .
Question 14
Which change does heat energy cause? (1 point)
Responses

slower molecule movement
slower molecule movement

reduced energy transfer
reduced energy transfer

greater energy differences between molecules
greater energy differences between molecules

more collisions between molecules
more collisions between molecules
Question 15
Which statement is true about molecule speed?(1 point)
Responses

Slower molecules are smaller than faster molecules.
Slower molecules are smaller than faster molecules.

Faster molecules have fewer collisions than slower molecules.
Faster molecules have fewer collisions than slower molecules.

Faster molecule have more energy than slower molecules.
Faster molecule have more energy than slower molecules.

Slower molecules are oriented better than faster molecules.
Slower molecules are oriented better than faster molecules.
Question 16
Which change does heat energy cause?(1 point)
Responses

slower molecule movement
slower molecule movement

reduced energy transfer
reduced energy transfer

greater energy differences between molecules
greater energy differences between molecules

more collisions between moelcules
more collisions between moelcules
Question 17
Which statement is true about molecule speed?(1 point)
Responses

Slower molecules are smaller than faster molecules.
Slower molecules are smaller than faster molecules.

Faster molecules have fewer collisions than slower molecules.
Faster molecules have fewer collisions than slower molecules.

Slower molecules are oriented better than faster molecules.
Slower molecules are oriented better than faster molecules.

Faster molecules have more energy than slower molecules.
Faster molecules have more energy than slower molecules.
Question 18
(1 point)
Responses

Each reactant has more chemical potential energy than each product.
Each reactant has more chemical potential energy than each product.

It takes more energy to form C-H bonds in the reactants than is released from C-H bonds in the products.
It takes more energy to form C-H bonds in the reactants than is released from C-H bonds in the products.

The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.
The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.

More chemical potential energy is stored in the bonds of CH4
than in the bonds of CH3N
.

Answer 1

Here are the correct answers and explanations for the questions you provided:

Question 8: The electrolysis of hydrochloric acid (HCl) produces hydrogen gas (H2) and chlorine gas (Cl2). The reaction involves the breaking of bonds in the reactants and the formation of bonds in the products. The correct answer is:

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

Question 9: This question was not fully clear as there may have been a typo regarding the number of O=O or O-O bonds mentioned. However, if we consider the semantic interpretation: The correct response might be something along the lines of:

• Four C-H bonds, one C=C bond, and three O=O bonds need to break up. Four C=O bonds and four O-H bonds need to form. (Assuming from context that these options correctly relate to breaking and forming bonds in a combustion or reaction context.)

Question 10: The phrase that defines bond energy is:

• energy required to break a chemical bond.

Question 11: The direct effect of a catalyst is:

• decreasing activation energy.

Question 12: The process of water evaporating is:

• It is endothermic because heat from the surroundings has to be absorbed by the water in order to change states.

Question 13: The source of the activation energy required for the reaction in a gas stove is:

• The flame from the burner provides the energy to perform the reaction. The reaction is exothermic.

Question 14: The change that heat energy causes is:

• more collisions between molecules.

Question 15: The true statement about molecule speed is:

• Faster molecules have more energy than slower molecules.

Question 16: (Duplicate) The change that heat energy causes is:

• more collisions between molecules. (Same as question 14)

Question 17: (Duplicate) The true statement about molecule speed is:

• Faster molecules have more energy than slower molecules. (Same as question 15)

Question 18: The statement that is likely true, given typical chemical reactions, is:

• The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.

If you have any further questions or clarifications needed for the topics mentioned, feel free to ask!

Answer 2

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

(1 point)
Responses

is one of the products of the reaction.
is one of the products of the reaction.

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

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

provides the kinetic energy for the reactions.