Physical and Chemical Changes Quiz

What are chemical changes also known as?

• Physical reactions

• Chemical reactions

• Biological changes

• Physical changes

Can chemical changes usually be undone?

• Yes, they are reversible

• No, they are irreversible

• Yes, they are temporary

• No, they are permanent but can be undone

How many signs indicate that a chemical change is occurring?

• Three

• Four

• Five

• Six

Which of the following is an example of a chemical change where heat, light, or sound is produced?

• Melting ice

• Dissolving sugar in water

• Burning wood

• Freezing water

What is a common sign that a chemical change has occurred, as demonstrated by cracking a glow stick?

• Change in temperature only

• Change in state of matter

• Production of light

• Formation of a precipitate

Identify the activity that does not involve a chemical change.

• Fireworks exploding

• Cracking a glow stick

• Burning wood

• Cutting paper

What is an example of a colour change indicating a chemical change?

• A) A car changing colour under different lighting

• B) Toasting bread

• C) Water changing colour when food dye is added

• D) A chameleon changing its colour

What happens to the colour of copper when it reacts with air and water?

• A) It changes from bronze to silver

• B) It changes from bronze to gold

• C) It changes from bronze to mint green

• D) It changes from bronze to red

What colour change occurs to bananas as they ripen?

• A) The peel turns from green to yellow

• B) The peel turns from yellow to brown

• C) The peel turns from brown to black

• D) The peel turns from yellow to green

What gas is released during the chemical reaction between baking soda and vinegar?

• Oxygen (O2)

• Hydrogen (H2)

• Carbon dioxide (CO2)

• Nitrogen (N2)