Question

1. A scientist is studying a previously unknown chemical reaction. She concludes that it is exothermic. What must the scientist have observed?

a.) The reaction released heat.
b.) The reaction formed a gas.
c.) The reaction sped up when a catalyst was added.
d.) The reaction caused the container to get cold.

2. Which of the following best explains why most chemical reactions proceed more quickly when the concentrations of reactants are increased?

a.) The increased concentration increases the number of collisions between molecules.
b.) The products of chemical reactions are more stable at high concentrations.
c.) At higher concentrations, reactant molecules move more quickly.
d.) At higher concentrations, product molecules are able to catalyze the reaction.

@Mertsj ??

Answer 1

Do you know you could have looked up what exothermic means much quicker than you could post this question?