Balancing Reactions

Front

What is a chemical change?

Back

A chemical change is a process where one or more substances are transformed into different substances with distinct properties.

Front

What is the purpose of a coefficient in a chemical equation?

Back

A coefficient indicates the number of molecules or moles of a substance involved in a chemical reaction.

Front

How many molecules of water are produced in the reaction 2H2 + O2 -> 2H2O?

Back

2 water molecules are produced.

Front

What is a decomposition reaction?

Back

A decomposition reaction is a type of chemical reaction where a single compound breaks down into two or more simpler products, represented as AB -> A + B.

Front

In a balanced chemical equation, what must be the same on both sides?

Back

The same number of atoms of each element must be present on both sides of the equation.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

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

Front

What does it mean to balance a chemical equation?

Back

Balancing a chemical equation means adjusting the coefficients to ensure that the number of atoms of each element is the same on both sides of the equation.

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, while a chemical change results in the formation of new substances.