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 making a 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

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, the water changes color. Is this a physical or chemical change? Explain why.

Tags

NGSS.MS-PS1-2

Describe four different pieces of evidence that indicate a chemical change has occurred.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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 sugar 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