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.

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.