Unit 3 Review Y23-24

Front

What is the law of conservation of mass?

Back

Matter cannot be created or destroyed in a chemical reaction; it can only be transformed.

Front

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

Back

20g of products.

Front

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

Back

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

Front

What is produced when calcium carbonate (CaCO3) is heated?

Back

Calcium oxide (CaO) and carbon dioxide (CO2).

Front

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

Back

62g of magnesium fluoride.

Front

What does it mean to transform matter?

Back

To change matter from one form to another without changing its mass.

Front

What is an example of a chemical change?

Back

Burning wood, which transforms it into ash and gases.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is the difference between reactants and products?

Back

Reactants are substances that start a chemical reaction, while products are substances formed as a result of the reaction.

Front

What is the significance of balancing chemical equations?

Back

To ensure that the law of conservation of mass is upheld, meaning the number of atoms of each element is the same on both sides of the equation.