Law of Conservation of Mass

In the equation shown, what are the reactant(s)?

• N₂ + H₂

• NH₃

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?

• The wood disappears.

• It stays the same chemically.

• The atoms in the wood and oxygen rearrange and form smoke and ash.

• Nothing.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

The law of conservation of mass states that ________

• the total mass of reactants is more than the total mass of products

• the mass of a chemical reaction is not constant

• the mass of a chemical reaction remains constant

• the total mass of reactants is less than the total mass of products

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NGSS.MS-PS1-5

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

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

________ are the starting substances in a chemical equation.

• Reactants

• Producer

• Reaction

• Products

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NGSS.MS-PS1-5

How many grams of OXYGEN would be needed to show conservation of mass in the example below?

• 100 g

• 93 g

• 7 g

• 0 g

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many grams of coal were present at the start of the chemical change?

• Unknown

• 100 g

• 200 g

• 50 g

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many grams of CHOCOLATE POWDER are shown in the example of conservation of mass below?

• 450 g

• 465 g

• 0 g

• 15 g

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 only conserved in physical changes.

Tags

NGSS.MS-PS1-5

In a closed system, if 10 grams of hydrogen react with 80 grams of oxygen to form water, what will be the total mass of water produced?

• 70 grams

• 80 grams

• 90 grams

• 100 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5