Chemical Reactions and Conservation of Mass

According to the law of conservation of mass...

• sometimes atoms are lost
• sometimes atoms are gained
• atoms are never lost nor gained
• atoms are lost and gained

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

What are the products of the chemical reaction pictured?

• CH₄ and CO₂
• CH₄ and O₂
• CO₂ and H₂O
• O₂ and H₂O

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

What are the reactants in the chemical equation pictured?

• CH₄ and CO₂
• CH₄ and O₂
• CO₂ and H₂O
• O₂ and H₂O

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is NOT an example of a chemical reaction?

• Wood Burning
• A cake baking in an oven
• Melting Ice Cream
• Mixing Vinegar and Baking Soda

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NGSS.MS-PS1-2

How many atoms of Carbon are in one molecule of table sugar (C₁₂H₂₂O₁₁) ?

• 12
• 22
• 11
• 1

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NGSS.MS-PS1-1

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same
• that matter can only be changed into new substances by introducing a catalyst
• that matter exists in the same state throughout any chemical change
• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

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NGSS.MS-PS1-5

a copper penny turning greenish after a few years.

• Chemical Change
• Physical Change

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NGSS.MS-PS1-2

An gel ice pack getting cold after you put it in the freezer for an hour.

• Chemical Change
• Physical Change

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following IS a physical change?

• Getting a haircut
• Rusty metal
• sour milk
• A compound

Which of the following is true about the atoms involved in a chemical reaction?

• The same number of each type of atom will be present before and after a chemical reaction
• Some of the atoms present before the reaction will be lost during a chemical reaction
• Some of the atoms will be hcanged into a different type of atom by a chemical reaction
• During a chemical reaction, atoms will always be combined into much larger molecules

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NGSS.MS-PS1-5