8.5E - Law of Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that matter cannot be created or destroyed in a chemical reaction; it can only be transformed or changed from one form to another.

Front

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

Back

The total mass of the reactants before the reaction is equal to the total mass of the products after the reaction.

Front

If 4 grams of hydrogen and 32 grams of oxygen react, what is the mass of the water produced?

Back

36 grams of water.

Front

In a chemical reaction, if the reactant AB has a mass of 12g and product B has a mass of 5g, how do you find the mass of product A?

Back

Subtract the mass of product B from the mass of the reactant: 12g - 5g = 7g.

Front

What is a reactant?

Back

A reactant is a substance that undergoes a chemical change in a reaction.

Front

What is a product?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

If a student mixes 125 grams of sugar, 250 grams of water, and 5 grams of flavoring, what is the total weight of the solution?

Back

The total weight of the solution is 380 grams.

Front

What does it mean when we say matter is 'transformed' in a chemical reaction?

Back

It means that the matter changes its form or composition but the total mass remains the same.

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change, where the wood transforms into ash, smoke, and gases.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.