9.3 Mastery Check

Front

What usually happens to TEMPERATURE in an ENDOthermic reaction?

Back

In an endothermic reaction, the temperature decreases as the system absorbs heat from the surroundings.

Front

The rate of a reaction increases as temperature__________________.

Back

The rate of a reaction increases as temperature increases.

Front

The rate of a chemical reaction is NOT affected by which of the following: temperature, concentration, particle size (surface area), All of these affect reaction rates.

Back

All of these affect reaction rates.

Front

What is the measure of how fast molecules are moving?

Back

Temperature is the measure of how fast molecules are moving.

Front

The substances present BEFORE a reaction occurs are called_______.

Back

The substances present before a reaction occurs are called reactants.

Front

What is an EXOthermic reaction?

Back

An exothermic reaction is a chemical reaction that releases heat, causing the temperature of the surroundings to increase.

Front

What is the effect of increasing concentration on reaction rate?

Back

Increasing concentration generally increases the reaction rate because there are more reactant particles available to collide.

Front

What role does surface area play in reaction rates?

Back

Increasing the surface area of reactants increases the reaction rate by allowing more collisions to occur.

Front

Define activation energy.

Back

Activation energy is the minimum energy required for a chemical reaction to occur.

Front

What is the difference between reactants and products?

Back

Reactants are the starting substances in a chemical reaction, while products are the substances formed as a result of the reaction.