Measuring Mass!

• Matter is not CREATED or DESTROYED

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• Matter can only be changed, chemically or physically.​

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The Law of Conservation of Mass

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​This is an ATOM - matter is made of atoms.

Because matter never appears or disappears ...

​MASS STAYS THE SAME

When matter goes through physical or chemical changes, the mass always stays the same.

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For example, a snowman has 25 kilograms of mass.​ When the snowman melts, the puddle of water still has 25 kilograms of mass.

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​Examples!

Open Ended

Explain the Law of Conservation of Mass (use the slides as a resource)

Multiple Choice

If an ice cube melts, does the mass of that object change?

• No

• Yes

Multiple Choice

If each Lego has a mass of 3 grams, what is the mass of the tower when they are stuck together?

• 21 grams

• 21 kilograms

• 7 grams

• 14 grams