Law of Conservation of Mass

What is the Law of Conservation of mass?

• Mass is created in a chemical reaction
• Mass is created in a physical change
• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
• Mass is never created or destroyed

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The tiny particles called ________ are the building blocks of all matter. 

• Organs

• Molecules

• Energy

• Atoms

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Matter can not be created nor destroyed: it can only be

• Destroyed a little bit
• Invisible
• Transformed, changed
• None of the above

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NGSS.MS-PS1-5

When water changes between the states of solid, liquid, and  gas, water undergoes  ________________ changes.

• Physical

• Chemical

• Metamorphic

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When a chemical reaction happens, what happens to the atoms?

• They disappear

• They are created

• They move and rearrange

• They are destroyed

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A rock melts and becomes magma. What happens to its mass?

• The mass disappears

• The mass stays the same

• The mass increases

• The mass decreases

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Students react baking soda & vinegar.
Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?

• The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.
• Bubbles were produced during the reaction, which meant that a gas was being produced.
• The plastic bag did not change in any way, indicating that it was not involved in the reaction.
• The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.

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A student says, "The rock lost mass when it broke apart." What is the best response?

• The mass decreased

• The mass turned into heat

• The mass is still there, just in smaller pieces

• The rock cycle stopped

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What is a molecule?

• A group of atoms bonded together
• Basic unit of a chemical element
• A coefficient

• A bunch of cells put together

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What is mass?

• How heavy something feels

• The amount of matter in an object

• The force pulling objects down

• How fast something falls

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