Chemical Reactions Law of Conservation of Matter

Based on the Law of Conservation of Matter, describe the relationship between the mass of the reactants and the mass of the products.

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

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

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

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

Tags

NGSS.MS-PS1-5

If the mass of a chemical reaction's product is 15 grams, what would the mass of the reactants be?

• 20 g

• 15 g

• 10 g

• 3 g

Tags

NGSS.MS-PS1-5

Which section represents the reactants?

• A

• B

• C

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Which section represents the products?

• A

• B

• C

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which section represents the yield sign?

• A

• B

• C

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

Tags

NGSS.MS-PS1-5

If a chemical reaction occurs in a closed system (no way for any part of the reaction to escape), how does the product mass compare to the reactant mass?

• the mass would decrease

• the mass would increase

• the mass would stay the same

• it depends on the type of reaction

Tags

NGSS.MS-PS1-5

If a chemical reaction occurs in an open system (not contained), what might happen to the measurable mass of the products when compared to the reactants?

• the measurable mass might decrease because any gas produced can escape (the actual mass would stay the same)

• the mass would increase because mass was created

• the measurable mass would stay the same because nothing would be able to leave the system.

• it depends on the type of reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which picture below would correctly demonstrate the Law of Conservation of Matter if this picture is the reactants?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a balanced chemical equation, if there are 4 Hydrogen in the reactants, how many Hydrogen should be in the product?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5