The Law of Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that in a closed system, the total mass of reactants before a chemical reaction is equal to the total mass of products after the reaction.

Front

How many elements are in the chemical formula C_{12}H_{22}O_{11}?

Back

3

Front

How many Ca (Calcium) atoms are in Ca(OH)_{2}?

Back

1 atom

Front

What happens to the total mass of substances after a chemical reaction?

Back

It remains the same.

Front

Which of the following substances cannot be broken down into simpler substances: Na, H_2O, C_6H_{12}O_6, CO?

Back

Na

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

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

Back

20g of products.

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is a substance formed when two or more elements are chemically bonded together.