Law of conservation of mass

Front

What does the Law of Conservation of Mass state?

Back

Matter cannot be created or destroyed; it can only be transformed or changed.

Front

What is a coefficient in a chemical equation?

Back

A number placed in front of a compound or element to indicate how many molecules or atoms are present.

Front

How many oxygen atoms are represented in the chemical formula 2H2O?

Back

There are 2 oxygen atoms.

Front

If a chemical reaction starts with 50g of reactants, how much mass should the products have?

Back

The products should also have a total mass of 50g.

Front

What is mass?

Back

Mass is a measure of the amount of matter in an object.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.

Front

What is a subscript in a chemical formula?

Back

A number written below and to the right of a chemical symbol indicating the number of atoms of that element in a molecule.

Front

What is an example of a chemical reaction that demonstrates the Law of Conservation of Mass?

Back

Burning wood: the mass of the wood and oxygen used equals the mass of the ash, gases, and heat produced.

Front

What happens to the total mass of reactants in a closed system during a chemical reaction?

Back

The total mass remains constant; it is equal to the total mass of the products.

Front

What is the formula for calculating mass?

Back

Mass = Density × Volume.