S.3.4 - Demonstrate How Conditions Affect Chemical Reactions

Question 1

The stage of a chemical reaction in which both reactants and products are present and their concentrations no longer change

Answer 1

equilibrium

Question 2

A substance that increases the rate of a chemical reaction without undergoing permanent chemical change by lowering the activation energy required for the reaction to occur

Answer 2

Catalyst

Question 3

Involving absorption of heat

Answer 3

endothermic

All of these conditions can be applied to an equation to assess the rate

Question 4

Involving release of heat

Answer 4

exothermic

All of these conditions can be applied to an equation to assess the rate

Question 5

A principle stating that when a chemical reaction at equilibrium is perturbed, it responds by proceeding in a direction that will restore the equilibrium​​​​​​​

Answer 5

Le Chatelier’s principle

or the hemoglobin example above, inhalation c

Hb + 4O2 ⥂ HB(O2)4​​​​​​​

Question 6

The minimum energy needed to initiate a chemical reaction

Answer 6

activation energy

Question 7

For the reaction CO + H2 ⥂ CH4 + H2O + heat,​​​​​​​ equilibrium would favor the reactant side if which of the following occurs?

Answer 7

H2O is added

Adding a product perturbs the equilibrium, and it is reestablished by forming more reactants.

Question 8

Which of the following would increase the forward rate of this gas phase reaction?

CO + H2 ⥂ CH4 + H2O + heat​​​​​​​

Answer 8

Adding CO

Adding a reactant increases the likelihood of collisions forming products.

Question 10

An enzyme does which of the following to a chemical reaction?​​​​​​​

Answer 10

Speeds up both the forward and reverse reactions

Enzymes lower the activation energy, which increases the rate of both the forward and reverse reactions.