Chemical Changes Review

Which of these is a chemical change that happens when a piece of iron rusts?

• It begins to smell bad.

• It gives off heat.

• It turns into a hard matter.

• It becomes brittle and easy to break.

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NGSS.MS-PS1-2

A scientist mixes two liquids together. The result is a new solid substance. Which of these is true about this solid?

• The solid has different properties now compared to the two liquids.

• The solid was formed by a physical change, not a chemical change, in the two liquids.

• The solid can be separated back into the two liquids.

• The solid has the same state of matter as the two liquids.

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NGSS.MS-PS1-2

Select the CHEMICAL changes:

• Boiling water.

• Folding paper into a paper airplane.

• Burning wood on a fire.

• Fireworks going off.

• Cooking an egg on the stove.

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Select the CHEMICAL changes:

• Dying your hair.

• Cutting your hair.

• Burning toast.

• Cutting toast into triangles to eat.

• Brushing your hair.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Choose 2 examples of a chemical change.

• melting wax

• rusting metal

• folding a blanket (fabric)

• digesting food

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Mr. Sauls mixed 2 substances together. What is the best evidence that a CHEMICAL change occurred when he mixed both substances?

• The substance changed in density, volume, or mass.

• The substance changed in color

• The substance is a liquid

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NGSS.MS-PS1-2

Which is an example of a chemical change?

• melting ice to make water
• baking cake batter to make a cake
• putting cheese on bread to make a cheese sandwich
• cutting an orange into slices for a snack

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NGSS.MS-PS1-2

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Gwen’s family built a wood fire in the fireplace. The next day, Gwen noticed that there was no wood left in the fireplace, only ashes. Which best explains this?

• Wood is separated from ashes as it burns.
• Wood becomes a new substance as it burns.
• Ashes have the same properties as wood.
• Ashes are the same substance as wood.

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NGSS.MS-PS1-2

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Wendy left her bike outside, buried in snow. In the spring, when the snow melted, she found her bike covered in rust. Which best describes the change to the bike?

• It was a chemical change, because the bike was a different color.
• It was a chemical change, because the rubber tires were deflated.
• It was a chemical change, because rust can be removed from the metal.It was a chemical change, because rust is a new substance on the metal.
• It was a chemical change, because rust can be removed from the metal.

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NGSS.MS-PS1-2

Exploding fireworks is a

• Physical Change

• Chemical Change

• Katy Perry Song

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