Physical & Chemical Changes

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Which of the following is an example of a chemical change?

• Melting ice
• Burning wood
• Dissolving salt in water
• Boiling water

What is the difference between a homogeneous and heterogeneous mixture?

• Homogeneous mixtures have visible particles, while heterogeneous mixtures do not
• Homogeneous mixtures are made of different substances, while heterogeneous mixtures are made of the same substance
• Homogeneous mixtures cannot be separated, while heterogeneous mixtures can
• Homogeneous mixtures can be separated, while heterogeneous mixtures cannot

What role do molecules play in PHYSICAL changes?

• They rearrange to form new substances
• They are destroyed
• They remain unchanged
• They are created

What role do molecules play in CHEMICAL changes?

• They rearrange to form new substances
• They are destroyed
• They remain unchanged
• They are created

Which of the following is an example of a chemical property?

• Ability to rust
• Ability to melt
• Ability to conduct electricity
• Ability to dissolve in water

What is the difference between a physical and chemical change?

• Physical changes involve a change in the substance's state, while chemical changes do not
• Physical changes involve a change in the substance's physical properties, while chemical changes do not
• Physical changes involve a change in the substance's chemical composition, while chemical changes do not
• Physical changes can't be reversed, while chemical changes can

Which of the following is an example of a physical property?

• Ability to rust
• Reactivity with acid
• Ability to conduct electricity
• Ability to burn

Can physical changes be reversed?

• No, never
• It depends on the substance
• Always
• Most of the time

Which of the following is an example of a physical change?

• Cooking an egg
• Rusting metal
• Burning wood
• Melting ice