Law of Conservation of Mass

Front

Matter can not be created nor destroyed: it can only be

Back

Transformed, changed

Front

If reaction starts with 20g of reactants, it should produce?

Back

a total of 20g of products

Front

The Law of Conservation of Mass States

Back

Mass cannot be created nor destroyed, it can only change form.

Front

Which of the models of a chemical reaction best represents the Law of Conservation of Mass? Options: A, B, C, D

Back

A

Front

Which of the models of a chemical reaction best represents the Law of Conservation of Mass? Options: A, B, C, D

Back

A

Front

Which of the models of a chemical reaction best represents the Law of Conservation of Mass? Options: A, B, C, D

Back

A

Front

A student pours hydrochloric acid (HCl) into an open beaker that contains a piece of magnesium (Mg). A chemical reaction occurs. Was there a total mass increase or a total mass decrease for this experiment?

Back

There was a decrease in mass.

Front

A student heated a 10 gram sample of a chemical in an open container. A chemical reaction occurred, and the mass of the sample was measured again. The mass of the sample was found to be less than before the reaction. Which of the following best explains the decrease in mass of the sample? Options: The heat caused the chemical to become less dense, The reaction gave off more heat than was added, Some of the lighter particles were destroyed, Some of the particles escaped as a gas formed.

Back

Some of the particles escaped as a gas formed.

Front

A student dissolved 25 grams of salt into 1,000 grams of water. What should the mass of the saltwater mixture be?

Back

1,025 grams

Front

Why did the mass of an iron nail increase after heating over a bunsen burner?

Back

Extra particles from the air were added to the nail during burning.