Intro - Law of Conservation of Mass Review

Front

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

Back

Transformed, changed

Front

If reaction starts with 20g of reactants, what is the total mass of products produced?

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 containing magnesium (Mg). Was there a total mass increase or 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

What are the starting substances in a chemical equation?

Back

Reactants