Chemical Change vs Physical Change

Below is characteristic of chemical change …

• New product are formed

• New product are not formed

• Usually reversible

• Some changes occurs when heating or cooling is done

Sharpening a pencil is …

• Physical change

• Chemical change

Burning wood in campfire is …

• Physical change

• Chemical change

Bright copper changes to green when the copper reacts with certain gases in the air is sign of chemical reaction …

• Change in color

• Change in odor

• Formation of precipitate

• Formation of bubble

Is mold growing on cheese a physical or chemical change?

• Physical change

• Chemical change

Is the formation of the grand canyon a physical or chemical change?

• Physical change

• Chemical change

Which of the following is NOT a sign of a chemical reaction?

• Color changes

• Cutting into fourths

• Light is produced

• Gas is formed

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

• crumpled paper

• pencil sharpening

• shrunken clothing

• sour milk

Why is tearing a piece of paper only a physical change?

• It changes the paper

• It is hard to tear

• It only changes its size, but it's still paper

• None of the above

What is a PRECIPITATE in chemical reaction?

• When it rain

• When a solid forms after 2 liquids mix and react

• When a solid forms after steam is produced.

• When a solid forms after a liquid freezes