AAD Law of Conservation of Mass

Front

What is the law of conservation of mass?

Back

The mass of the reactants equals the mass of the products.

Front

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

Back

Model A represents the Law of Conservation of Mass.

Front

Is the equation H2 + O2 --> H2O balanced or unbalanced?

Back

Unbalanced.

Front

A chemical reaction is balanced when:

Back

Both sides have the same number of atoms.

Front

What is the subscript of the chemical compound H2O?

Back

3.

Front

Define 'reactants' in a chemical reaction.

Back

Reactants are the starting substances that undergo a chemical change.

Front

Define 'products' in a chemical reaction.

Back

Products are the substances formed as a result of a chemical reaction.

Front

What does it mean for a chemical equation to be balanced?

Back

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

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula to indicate how many molecules are involved.

Front

What is a subscript in a chemical formula?

Back

A subscript indicates the number of atoms of an element in a molecule.