States of Matter and Chemical Reactions

1. What are the three states of matter?

• A. Light, sound, heat

• B. Solid, liquid, gas

• C. Water, ice, steam

• D. Metal, plastic, glass

2. What happens to the particles in a solid when it melts?

• A. They stop moving

• B. They move faster and spread out

• C. They disappear

• D. They change into different particles

3. Which of these is a chemical reaction?

• A. Ice melting

• B. Water evaporating

• C. Wood burning

• D. A glass breaking

4. Why does a gas take the shape of its container?

• A. The particles are very close together

• B. The particles move freely in all directions

• C. The particles are stuck together

• D. The particles are heavy and sink to the bottom

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

• A. A change in colour

• B. A change in shape

• C. Bubbles forming (gas produced)

• D. Heat or light being released

6. What happens to particles in a gas when it is cooled down?

• A. They move faster and spread out

• B. They stop moving completely

• C. They slow down and come closer together

• D. They turn into new particles

7. Why is rusting a chemical reaction?

• A. The iron changes shape

• B. The colour changes, and a new substance is formed

• C. The iron melts when it gets wet

• D. The rust disappears when scratched

8. Which of these statements is true about chemical reactions?

• A. Chemical reactions only happen in science labs

• B. Chemical reactions always produce heat

• C. Chemical reactions create new substances

• D. Chemical reactions can be reversed easily

9. Why is boiling water NOT a chemical reaction?

• A. The water disappears

• B. The particles in the water change permanently

• C. No new substance is formed

• D. The water particles stop moving

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

• A. A physical change creates new substances, a chemical change does not

• B. A chemical change changes the state of matter

• C. physical change can usually be reversed, a chemical change usually cannot

• D. A chemical change only happens when something is frozen