8. a log is burning in a fireplace. if the amount of oxygen reaching the log is decreased, which of the
following statements is true?
the reaction rate increases.
the reaction rate decreases.
the reaction rate remains the same.
the reaction rate only depends on the temperature.

Answer is: The reaction rate decreases.

Balanced chemical reaction of burning log:

C(s) + O₂(g) → CO₂(g).

The reaction rate is the speed at which reactants are converted into products.

Reaction rate depends on concentration (amount) of oxygen.

If amount of oxygen decreases, reaction rate also decreases and vice versa.

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.

c) should be the answer.