Law of Conservation of Mass Practice Test

According to the law of conservation of matter, we know that the total number of atoms does not change in a chemical reaction and thus mass is conserved. The reactant in this model is hydrogen peroxide. Hydrogen peroxide decomposes to produce water and oxygen gas. How many water molecules must be added to complete this model?

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Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is evidence of a chemical reaction?

• change in shape

• change in state of matter

• change in temperature

• malleability

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If there are 10 grams in the reactants how many will be in the products?

• 5

• 20

• 10

• 9

Tags

NGSS.MS-PS1-5

How many oxygen atoms are in the formula:

3CO₂

• 2

• 3

• 5

• 6

Tags

NGSS.MS-PS1-1

What is the subscript?

• 2

• 5

• 7

• 10

Tags

NGSS.MS-PS1-1

What is in box 1?

• coefficient

• element

• product

• equation

What is in box 2?

• products

• reactants

• chemical formula

• chemical equation

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is in box 3?

• Yield

• Products

• chemical equation

• chemical formula

Tags

NGSS.MS-PS1-1

What is true of the law of conservation of mass?

• There is less mass in products of an open system.

• There is always more mass in the products.

• The mass of products and reactants is equal.

• There is more mass in the reactants of a closed system.

Tags

NGSS.MS-PS1-5