Question

1 which example best describes a physical change? a baking a pie b burning a candle c making a paper airplane 2 brad accidentally left his crayon box in the car on a hot day. which best explains what happened to his crayons? a crayons melted; changed from solid to liquid b crayons melted; changed from liquid to solid c crayons evaporated; changed from liquid to solid 3 which is the best example of a change that can be undone? a clay put in an oven to harden b cake batter put in an oven to bake c chocolate left in a warm car to melt 4 which best describes why deflating the air from a basketball is an example of a physical change? a the basketball’s shape is changed. b the basketball’s color is changed. c the basketball’s size is changed. 5 which is an example of a chemical change? a melting ice to make water b baking cake batter to make a cake c putting cheese on bread to make a cheese sandwich

Explanation:

1. Making a paper airplane only changes the shape of the paper, which is a physical change. Baking a pie and burning a candle involve chemical reactions.
2. Crayons melting in a hot - car change from solid to liquid, which is a physical change of state.
3. Melting chocolate can be reversed by cooling it back to a solid state. Hardening clay and baking cake batter are irreversible chemical changes.
4. Deflating a basketball changes its shape due to the removal of air, which is a physical change. Color and size are not the main factors here.
5. Baking cake batter involves a chemical reaction that changes the composition of the batter. Melting ice is a physical change of state, and making a cheese - sandwich is a physical combination.

Answer:

1. C. making a paper airplane
2. A. crayons melted; changed from solid to liquid
3. C. chocolate left in a warm car to melt
4. A. The basketball’s shape is changed.
5. B. baking cake batter to make a cake