Law of Conservation of Mass

What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?

• They both will weigh the same

• The product always weighs more than the reactant

• The reactant will weigh more than the product

• They both will loose mass after the reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Anthony is performing an experiment. He adds 0.25 grams of baking soda to 5 grams of water and stirs. Anthony watches as the baking soda dissolves in the water. If Anthony weighs the water and baking soda solution, what will its mass be?

• 4.75 grams

• 5.0 grams

• 5.25 grams

• 7.5 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Antonio conducts an investigation by adding reactants in a sealed container, as shown in the illustration. One of the reactants is 19g and the other reactant is 5g. After the reaction, Antonio can predict the total mass of the products of this reaction to be which of the following?

• 5g

• 14g

• 19g

• 24g

Tags

NGSS.MS-PS1-5

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-PS1-2

NGSS.MS-PS1-5

In a sealed container, Sarah combines a reactant with a mass of 20 grams with another reactant with a mass of 16 grams. After the reaction, what is the most reasonable prediction Sarah can make for the total mass of the products of this reaction?

• 26g

• 4g

• 8g

• 36g

Tags

NGSS.MS-PS1-5

One reactant with a mass of 6 grams, is combined with another reactant, with a mass of 18 grams, in a sealed container. After the reaction, what is the most reasonable prediction for the total mass of the products of this reaction?

• 12g

• 4g

• 20g

• 24g

Tags

NGSS.MS-PS1-5

In a closed system, if 5 grams of hydrogen react with 40 grams of oxygen, what will be the total mass of water produced?

• 45 grams

• 40 grams

• 5 grams

• 50 grams

Tags

NGSS.MS-PS1-5

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

• Mass is created during a chemical reaction

• Mass is destroyed during a chemical reaction

• Mass is neither created nor destroyed during a chemical reaction

• Mass is always lost during a chemical reaction

Tags

NGSS.MS-PS1-5

In a chemical reaction, 10 grams of reactant A reacts with 15 grams of reactant B. What is the total mass of the products?

• 10 grams

• 15 grams

• 25 grams

• 5 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A sealed container has 100 grams of reactants. After the reaction, the mass of the products is measured. What should it be according to the Law of Conservation of Mass?

• 90 grams

• 100 grams

• 110 grams

• 95 grams

Tags

NGSS.MS-PS1-5