Law of conservation of mass

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

What is a pure substance?

Back

A substance that has the same properties every time and everywhere.

Front

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

Back

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

Front

What is a chemical reaction?

Back

A process where substances (reactants) are transformed into new substances (products).

Front

What is a precipitate?

Back

A solid that forms when two liquids are mixed.

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.

Front

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

Back

20g of products.

Front

What is an example of a physical change?

Back

Melting of ice.

Front

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

Back

A chemical change results in the formation of new substances, while a physical change does not.

Front

What is the role of a catalyst in a chemical reaction?

Back

A catalyst speeds up a chemical reaction without being consumed in the process.