5-1 Rates & Balancing Review 2025

Front

What is the balanced equation for the reaction of hydrogen and oxygen to form water?

Back

2 H₂ + O₂ -> 2 H₂O

Front

What are the substances at the beginning of a chemical equation called?

Back

Reactants

Front

What does the Law of Conservation of Mass state?

Back

Matter cannot be gained or lost in a chemical reaction.

Front

Why does a higher temperature increase the rate of a reaction?

Back

It increases both the frequency and energy of particle collisions.

Front

Which of the following is a balanced chemical equation? 1) PbO₂ + 2H₂ -> 2Pb + O₂ 2) 2Na + 2H₂O -> 2NaOH + H₂

Back

2Na + 2H₂O -> 2NaOH + H₂

Front

What is a product in a chemical reaction?

Back

The substances formed as a result of a chemical reaction.

Front

Define a chemical equation.

Back

A symbolic representation of a chemical reaction showing the reactants and products.

Front

What is the role of a catalyst in a chemical reaction?

Back

A catalyst speeds up a reaction without being consumed in the process.

Front

What is activation energy?

Back

The minimum energy required for a chemical reaction to occur.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition; a chemical change results in the formation of new substances.