Law of Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

Front

If a reaction starts with 20g of reactants, how much mass should the products have?

Back

20g of products, according to the Law of Conservation of Mass.

Front

What is a precipitate?

Back

A precipitate is a solid that forms when two liquids are mixed together.

Front

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

Back

Melting of ice is not a chemical reaction; it is a physical change.

Front

How many grams of chocolate powder are shown in the example of conservation of mass?

Back

15 grams.

Front

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

Back

The mass of the reactants remains the same before and after the reaction.

Front

What is an example of a chemical reaction?

Back

Burning wood is an example of a chemical reaction.

Front

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

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

How many kilograms of smoke are shown in the example of conservation of mass?

Back

3 kilograms.

Front

What is the role of reactants in a chemical reaction?

Back

Reactants are the starting substances that undergo a chemical change to form products.