Law of Conservation of Matter Post Test

Front

What does a balanced chemical equation show?

Back

The products of a reaction.

Front

What is the correct representation of the balanced chemical equation for the reaction between hydrogen gas (H₂) and nitrogen gas (N₂) to form ammonia (NH₃)?

Back

3H₂ + N₂ → 2NH₃

Front

Define the Law of Conservation of Matter.

Back

Matter cannot be created or destroyed in a chemical reaction; it can only change forms.

Front

What is a reactant in a chemical reaction?

Back

A substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

A substance that is formed as a result of a chemical reaction.

Front

How do you balance a chemical equation?

Back

By ensuring that the number of atoms of each element is the same on both sides of the equation.

Front

What is the significance of coefficients in a chemical equation?

Back

Coefficients indicate the number of molecules or moles of a substance involved in the reaction.

Front

What is the balanced equation for the combustion of methane (CH₄)?

Back

CH₄ + 2O₂ → CO₂ + 2H₂O

Front

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

Back

A physical change alters the form of a substance without changing its identity, while a chemical change results in the formation of new substances.

Front

What is the role of catalysts in chemical reactions?

Back

Catalysts speed up chemical reactions without being consumed in the process.