Law of conservation of mass

Front

What is the Law of Conservation of Mass?

Back

Mass is never created or destroyed.

Front

How many oxygen atoms are in the chemical formula 2Mg + O2 → 2MgO?

Back

6 oxygen atoms.

Front

Which of these is not a chemical reaction? Burning of wood, Milk going bad, Mixing vinegar and baking soda, Melting of ice?

Back

Melting of ice.

Front

If 24 g of magnesium reacts with 38 g of fluorine, what is the mass of magnesium fluoride produced?

Back

62 g.

Front

Matter cannot be created nor destroyed; it can only be what?

Back

Transformed or changed.

Front

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

Back

The total mass remains constant.

Front

What is a chemical reaction?

Back

A process that involves the rearrangement of atoms to form new substances.

Front

What is an example of a physical change?

Back

Melting of ice.

Front

What is the formula for calculating the total mass of products in a chemical reaction?

Back

Total mass of products = Total mass of reactants.

Front

What is the significance of balancing chemical equations?

Back

To ensure that the mass is conserved during the reaction.