Law of Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

Mass is never created or destroyed in a chemical reaction.

Front

What is a subscript in a chemical formula?

Back

A subscript is a number written below and to the right of an element symbol that indicates the number of atoms of that element in a molecule.

Front

If a chemical reaction starts with 20g of reactants, what should be the total mass of the products?

Back

The total mass of the products should be 20g.

Front

What are reactants in a chemical reaction?

Back

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

Front

What is a closed system in chemistry?

Back

A closed system is one where no matter enters or leaves, but energy can be exchanged.

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 or moles of that substance are involved.

Front

What happens to mass during a chemical reaction?

Back

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

Front

What is an open system in chemistry?

Back

An open system is one where both matter and energy can be exchanged with the surroundings.

Front

In the reaction 2Mg + O2 → 2MgO, what are the products?

Back

The products are 2MgO.

Front

What does it mean when we say mass is conserved?

Back

It means that the total mass remains constant, regardless of the processes acting inside the system.