Describing Chemical Reactions Review Questions

Front

What is the coefficient of O₂ in the reaction 2H₂ + O₂ → 2H₂O?

Back

1

Front

Which equation represents a balanced reaction between hydrogen and chlorine to form hydrogen chloride?

Back

H₂ + Cl₂ → 2HCl

Front

What is an example of a skeleton equation?

Back

Fe + O₂ → FeO

Front

What is the balanced equation for the reaction of aluminum with oxygen to form aluminum oxide?

Back

4Al + 3O₂ → 2Al₂O₃

Front

What is the definition of a chemical reaction?

Back

A process in which substances change into new substances with different properties.

Front

What is a balanced chemical equation?

Back

An equation where the number of atoms for each element is the same on both sides.

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.

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

What does it mean for a reaction to be balanced?

Back

It means that the number of atoms of each element is equal on both sides of the equation.