Answer the following questions about the experiment. i. What was the scientific question for this experiment? (2 points)

How is the atomic number of a nucleus changed by alpha decay

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.

The half-life of a certain element is 100 days. how many half-lives will it be before only one eighth of this elementremains?