Review- 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.

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NGSS.MS-PS1-5

NGSS.MS-PS1-2

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

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NGSS.MS-PS1-5

Which section represents the reactants?

• A

• B

• C

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NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which section represents the products?

• A

• B

• C

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NGSS.MS-PS1-2

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

NGSS.MS-PS1-2

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

NGSS.MS-PS1-2

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

• 
• 
• 
• 

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NGSS.MS-PS1-5

NGSS.MS-PS1-2

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

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NGSS.MS-PS1-5

NGSS.MS-PS1-1

Consider the chemical equation CH₄ + 2 O₂ → CO₂ + 2 H₂O. In this equation, CH₄ is a

• product
• reactant
• displacement

Tags

NGSS.MS-PS1-5