States of Matter Changes Quiz

Grade 3 · Science · Quiz

Test your knowledge of solids, liquids, gases, and the changes that happen when matter gains or loses heat.

Questions

1. Which state of matter has no definite shape and no definite volume?

   1. Solid
   2. Liquid
   3. Gas
   4. Plasma
   Show answer

   Answer: Gas

   Gas has no definite shape and no definite volume — gas particles spread out freely to fill any container completely.

2. What process occurs when liquid water is boiled and turns into steam?

   1. Freezing
   2. Melting
   3. Condensation
   4. Evaporation
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   Answer: Evaporation

   Evaporation (vaporization) is when a liquid absorbs heat and changes into a gas. Boiling water turning into steam is evaporation.

3. Water droplets form on the outside of a cold glass of lemonade. This is an example of which process?

   1. Evaporation
   2. Condensation
   3. Melting
   4. Sublimation
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   Answer: Condensation

   Condensation is when water vapor (gas) in the warm air contacts a cold surface, loses heat, and changes into liquid water droplets.

4. At what temperature does water freeze into ice?

   1. 100 degrees Celsius
   2. 32 degrees Celsius
   3. 0 degrees Celsius
   4. 50 degrees Celsius
   Show answer

   Answer: 0 degrees Celsius

   Water freezes at 0 degrees Celsius (32 degrees Fahrenheit). That is the freezing point of water.

5. Which change of state requires ADDING heat energy?

   1. Freezing (liquid to solid)
   2. Condensation (gas to liquid)
   3. Melting (solid to liquid)
   4. None of the above
   Show answer

   Answer: Melting (solid to liquid)

   Melting (solid to liquid) requires the addition of heat energy. Freezing and condensation release heat energy.

6. Dry ice (frozen carbon dioxide) turns directly from solid to gas without becoming a liquid. What is this process called?

   1. Evaporation
   2. Condensation
   3. Sublimation
   4. Melting
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   Answer: Sublimation

   Sublimation is the direct change from solid to gas, skipping the liquid stage. Dry ice sublimates at room temperature.

7. When matter changes state, the type of substance changes and becomes something new.

   Show answer

   Answer: False

   Changes of state are physical changes. The substance remains the same — water is still water whether it is ice, liquid, or steam.

8. The change from a solid to a liquid is called ______.

   Show answer

   Answer: melting

   Melting is the process by which a solid absorbs heat energy and changes into a liquid. The melting point of water (ice) is 0 degrees Celsius.

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