7th: et-5.18 Conservation of Mass in Chemical RXN MAKE-UP cK-12

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

• A

• B

• C

• D

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

• A

• B

• C

• D

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

• A

• B

• C

• D

Why does this picture demonstrate the Law of Conservation of Mass?

• the number of atoms of each element are the same on both sides

• they start out separate and end up combined

• the same elements are used

• it doesn't demonstrate the Law of Conservation of Mass

What does the law of conservation of mass state in a chemical reaction?

• The total mass of the reactants is always less than the total mass of the products.

• The total mass of the reactants is always greater than the total mass of the products.

• The total mass of the reactants is equal to the total mass of the products.

• The mass of each individual reactant is conserved separately and does not combine in the products.

• 36 grams

• 18 grams

• 32 grams

• 4 grams

Which of the following is NOT an application of the law of conservation of mass?

• Predicting the amount of product formed in a chemical reaction.

• Determining the composition of unknown substances.

• Calculating the energy released in nuclear reactions.

• Balancing chemical equations.

• Less than 10 grams

• Exactly 10 grams

• More than 10 grams

• Cannot be determined without the exact reaction equation

Why is the law of conservation of mass important in chemical equations?

• It ensures that all atoms are accounted for, from reactants to products.

• It allows chemists to use any amount of reactants they want.

• It proves that chemical reactions can create and destroy atoms.

• It indicates that reactions do not follow predictable patterns.

In a laboratory experiment, 12 grams of magnesium reacts completely with 71 grams of hydrochloric acid to produce magnesium chloride and hydrogen gas. According to the law of conservation of mass, what is the total mass of the products?

• 83 grams

• 59 grams

• 71 grams

• It cannot be determined from the given information.