Law of Conservation of Math

One reactant, with a mass of 7 grams (g), is combined with another reactant, with a mass of 3 g, in a sealed container. After the reaction, what is the most reasonable prediction for the total mass of the products of this reaction?

• 7g

• 3g

• 10g

• 4g

Tags

NGSS.MS-PS1-5

A chemical reaction occurs in a closed system. If the mass of the reactants is 50 grams, what will be the mass of the products?

• 45 grams

• 50 grams

• 55 grams

• 60 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a closed system, 10 grams of hydrogen reacts with 80 grams of oxygen. What is the total mass of water produced?

• 70 grams

• 80 grams

• 90 grams

• 100 grams

Tags

NGSS.MS-PS1-5

Which of the following best describes the Law of Conservation of Mass?

• Mass can be created or destroyed in a chemical reaction.

• Mass is conserved in a closed system during a chemical reaction.

• Mass is always lost in a chemical reaction.

• Mass is always gained in a chemical reaction.

Tags

NGSS.MS-PS1-5

A scientist measures 20 grams of reactant A and 30 grams of reactant B in a closed container. After the reaction, the mass of the products is measured. What should it be?

• 20 grams

• 30 grams

• 50 grams

• 60 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If 5 grams of salt is dissolved in 100 grams of water, what is the total mass of the solution?

• 95 grams

• 100 grams

• 105 grams

• 110 grams

Tags

NGSS.MS-PS1-5

During a chemical reaction in a sealed container, the mass of the reactants is 200 grams. What is the expected mass of the products?

• 180 grams

• 190 grams

• 200 grams

• 210 grams

Tags

NGSS.MS-PS1-5

A reaction in a closed system starts with 40 grams of reactants. After the reaction, the products weigh 35 grams. What happened?

• 5 grams of mass was lost.

• 5 grams of mass was gained.

• Mass was conserved; measurement error occurred.

• Mass was not conserved.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In an experiment, 15 grams of reactant X reacts with 25 grams of reactant Y. What is the total mass of the products?

• 30 grams

• 35 grams

• 40 grams

• 50 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What does the Law of Conservation of Mass state about the mass of reactants and products in a chemical reaction?

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

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

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

• The mass of the reactants is unrelated to the mass of the products.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5