Which of the following affects the rate of a chemical reaction?

a. the presence of a catalyst

b. the temperature

c. the concentration of reactants

d. all of the above

The answer is definitely D: all of the above.

Catalyst, the temperature (think about the reaction of the dissolving sugar in the water), and the concentration of reactants (think about the nuclear reactions).

Julio wants to find the volume of a small pebble. He drops it into a graduated cylinder filled with 30.0 mL of water.

How is Julio most likely trying to determine the pebble’s