Law of Conservation of Mass

Is this equation balanced?

• Yes

• No

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is this equation balanced?

• Yes

• No

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NGSS.MS-PS1-5

Is this equation balanced?

• yes

• no

• Not enough information

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

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

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

Tags

NGSS.MS-PS1-5

A student mixes 125 grams of sugar, 250 grams of water and 5 grams of flavoring. The solution weighs...

• 250 grams

• 380 grams

• 375 grams

• 400 grams

Which statement 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 increased during a chemical reaction.

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

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NGSS.MS-PS1-2

NGSS.MS-PS1-5