chemical and physical changes

What is the main difference between a physical & chemical change?

Based on the definition, which of these would not be a physical change?

• Bending a copper wire.

• A popsicle melting.

• Burning popcorn.

• Breaking a stick in half.

Why is this a physical change?

Which best explains why this is a physical change?

• You can still taste the salt in the water.

• It is a mixture that can be separated by evaporation.

Which of the following lists is only physical changes?

• Melting, evaporating, breaking, dissolving

• Bending, tearing, dissolving, rusting

• Melting, evaporating, burning, cutting

Based on the definition, which of these best describes what happens in a chemical change?

• The substance has changed its state of matter.

• The substance has completely changed to form something new.

• The substance has changed its size or shape

Which of these doesn't explain why this is a chemical change?

• The sugar is getting hotter.

• The sugar changes color.

• The liquid is bubbling releasing a gas.

Why is food digestion a chemical change?

• Food is being broken down and converted to energy.

• Chewing food makes smaller pieces to digest.

Which list contains only examples of chemical changes?

• Fermenting, fireworks, evaporation, melting.

• Burning, digesting, photosynthesis, rusting.

• Rusting, cooking, dissolving, rotting.