Law of Conservation of Mass

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 the reactants equals the total mass of the products.

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of an element in a molecule. For example, in H2O, the '2' is a subscript indicating there are two hydrogen atoms.

Front

What does a coefficient in a chemical equation represent?

Back

A coefficient indicates the number of molecules or moles of a substance involved in a reaction. For example, in 2H2 + O2 -> 2H2O, the '2' before H2O indicates there are two water molecules produced.

Front

How do you determine if a chemical equation is balanced?

Back

A chemical equation is balanced when the number of atoms of each element is the same on both sides of the equation.

Front

What are reactants in a chemical reaction?

Back

Reactants are the starting substances in a chemical reaction that undergo change to form products.

Front

What are products in a chemical reaction?

Back

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

Front

How many hydrogen (H) atoms are in one molecule of NH3?

Back

There are three hydrogen (H) atoms in one molecule of NH3.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations is important because it reflects the Law of Conservation of Mass, ensuring that mass is conserved during a reaction.

Front

What does the equation 4NH3 represent in terms of molecules?

Back

The equation 4NH3 represents four molecules of ammonia.

Front

What is the difference between a subscript and a coefficient?

Back

A subscript indicates the number of atoms of an element in a molecule, while a coefficient indicates the number of molecules or moles of a substance.