Physical and Chemical Changes Quiz

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

• Physical changes create new substances, chemical changes don't
• Chemical changes are always reversible, physical changes aren't
• Physical changes alter the form but not identity, chemical changes alter the identity
• There is no difference between physical and chemical changes

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

• Folding a paper airplane
• Chewing bubble gum
• Lighting a candle
• Cutting paper

What happens during a state change of matter, like water freezing?

• A new substance is formed
• The identity of the matter changes
• The form changes but not the identity
• The matter disappears

Which statement about physical changes is true?

• All physical changes are reversible
• No physical changes are reversible
• Some physical changes are reversible, some aren't
• Physical changes are always irreversible

What happens during a chemical change?

• The form of matter changes but not its identity
• Different matter meets to turn into new substances
• The matter always returns to its original state
• The matter disappears completely

Which of these is NOT mentioned as a sign of a chemical change?

• Change in color
• Production of odor
• Change in shape
• Release of heat

In the video, burning logs demonstrate which signs of a chemical change?

• Only light emission
• Light, heat, gas release, and smell
• Only color change
• Only gas release

What new substance is produced when logs burn?

• Water
• Smoke
• Ash
• Plastic

Which signs of chemical change are observed when an orange rots?

• Light emission and heat release
• Color change and odor production
• Bubble formation and sound production
• Heat absorption and light absorption

What is a key characteristic of chemical changes?

• They are always easily reversible
• They never produce new substances
• They are irreversible (or not easily reversed)
• They only happen to liquids