Law of Conservation of Mass/Energy

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

If a chemical reaction starts with 20g of reactants, how much product will be produced?

Back

20g of products, as mass is conserved.

Front

Can matter be created or destroyed in a chemical reaction?

Back

No, matter is always conserved.

Front

Fill in the blanks: The law of conservation of mass says substances can neither be _______ nor ___________.

Back

Created; destroyed.

Front

What is the total mass of products formed from 4 grams of hydrogen and 32 grams of oxygen?

Back

36 grams of water.

Front

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

Back

The mass remains constant; it is conserved.

Front

What is an example of matter being transformed?

Back

Water (H2O) can be transformed into steam (gas) or ice (solid) without changing its mass.

Front

What is the significance of the Law of Conservation of Energy?

Back

Energy cannot be created or destroyed, only transformed from one form to another.

Front

How does the Law of Conservation of Mass apply to balancing chemical equations?

Back

The number of atoms of each element must be the same on both sides of the equation.

Front

What is an example of a physical change where mass is conserved?

Back

Melting ice into water; the mass before and after remains the same.