Changes in Matter

Amanda wants to make a cake. She measures sugar, eggs, oil, flour, and flavorings. She mixes the ingredients together with a whisk. She pours the ingredients into a pan and bakes them. When the cake is baked, she frosts the cake. Which part of creating the cake is a chemical change?

• Mixing ingredients with a whisk, because the mixed ingredients form a thick liquid.

• Adding eggs because the eggs change shape when they are cracked.

• Baking the mixed ingredients because the ingredients change into a different substance.

• Putting frosting on the baked cake because frosting changes how the cake looks.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Which of the following best explains what happens when a popsicle melts?

• It is a physical change because a new substance was made.

• It is a physical change because it can be easily reversed.

• It is a chemical change because the properties of the popsicle changed.

• It was a chemical change because it cannot be easily reversed.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What is the difference between a chemical change and a physical change?

• A substance stays the same in a chemical change, but a new substance is formed in a physical change.

• After a physical change, a substance cannot change back, but it is easy to reverse a chemical change.

• A physical change includes changing state from solid to liquid, but changing from liquid to gas is a chemical change.

• A new substance is formed in a chemical change, but the substance stays the same in a physical change.

When you make a pitcher of fruit punch from a powdered packet of drink mix and the water changes color, is this a physical or chemical change?

• It is a physical change because no new substance is formed.

• It is a chemical change because a new substance is created.

• It is a chemical change because the powder dissolves.

• It is a physical change because the powder reacts with water.

Tags

NGSS.MS-PS1-2

Which of the following lists four pieces of evidence that indicate a chemical change has occurred?

• Color change, gas production, temperature change, formation of a precipitate

• Color change, melting, dissolving, boiling

• Gas production, freezing, condensation, sublimation

• Temperature change, evaporation, condensation, melting

Tags

NGSS.MS-PS1-2

Read each of the statements describing a change. 1. Using a magnet to remove iron shavings from a mixture of sand and iron 2. Melting butter 3. Lighting fireworks and then seeing the colors and hearing the sound pops as they go off 4. Cutting a piece of paper into smaller pieces 5. Burning firewood in a campfire Which of these examples describe physical changes?

• 1 and 4

• 2, 4, and 5

• 1, 2, and 4

• 1, 3, 4, and 5

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

• Rust forming on an iron nail

• Ice melting into water

• Baking bread in an oven

• Wood burning in a fireplace

Tags

NGSS.MS-PS1-2

What observation would best indicate that a chemical change has taken place?

• The material is cut into smaller pieces

• A new gas is produced and bubbles form

• The substance changes from a solid to a liquid

• The substance is dissolved in water

Tags

NGSS.MS-PS1-2

Which process represents a physical change rather than a chemical change?

• Burning a candle

• Rusting of iron

• Digesting food

• Boiling water

Which of the following is an example of a chemical change?

• Paper being torn into pieces

• Water freezing into ice

• Milk turning sour

• Salt dissolving in water

Tags

NGSS.MS-PS1-2