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States of Matter Worksheet
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States of Matter Worksheet
A cold-weather field team is testing mystery samples and watching water change state. Use the particle model and evidence in each task. Answer in your own words where asked.
What are the particles doing?
Use what you know about particle arrangement and movement to solve the team’s first clues.
1.A sealed container holds a solid block of ice. Which description best fits the particles in the ice?
- They are far apart and move freely in all directions.
- They are close together and vibrate around fixed positions.
- They slide past one another, changing places constantly.
- They do not move at all.
2.A sample takes the shape of its container but keeps the same volume. Which state is it, and how are its particles arranged and moving?
3.A scented vapour spreads through a tent from a small leak. Name the process that explains this spreading, and describe the direction in which particles move overall.
4.Which state of matter is most easily compressed? Explain your choice using the gaps between particles.
Follow the energy
The team warms and cools water to investigate changes of state.
5.Water vapour forms droplets on the outside of a cold drink bottle. Name the change of state and state whether the water gained or lost thermal energy during this change.
6.Match each change of state to its description: melting; freezing; evaporation; condensation. Descriptions: liquid to gas at the surface; liquid to solid; solid to liquid; gas to liquid.
- Melting
- Freezing
- Evaporation
- Condensation
- Liquid to solid
- Solid to liquid
- Liquid to gas at the surface
- Gas to liquid
7.A pot of water is boiling steadily at normal air pressure. Choose the best explanation for what happens to its temperature while it continues boiling.
- It keeps rising because the particles are moving faster and faster.
- It stays about 100 °C while energy is used to change liquid water into water vapour.
- It falls to 0 °C as the water becomes a gas.
- It changes randomly because bubbles have different temperatures.
8.A camper warms a metal spoon by leaving one end in hot soup. Name the main method of thermal energy transfer through the spoon and explain how the metal particles help transfer energy.
9.As ice melts, what happens to the arrangement and motion of its particles?
Explain the evidence
Use the particle model to interpret what the field team observes.
10.A chemical reaction happens inside a sealed container. The container’s total mass is measured before and after. Predict what the measurements should show, and explain your prediction using particles.
11.A metal rail is 200.00 cm long. When it warms, it expands by 0.06 cm. Calculate its new length. Show your addition and include the unit.
12.Choose the best explanation for why a metal rail expands when warmed.
- Its particles become larger.
- Its particles gain energy and vibrate more, increasing their average separation slightly.
- New particles are created inside the metal.
- The metal changes into a liquid.
13.A metal tent peg and a plastic peg have been lying in the same sunny place. The metal feels hotter to the touch. Does this necessarily mean the metal is at a higher temperature? Explain using heat transfer.
For written explanations, include the state change or particle behaviour and connect it to the evidence in the scenario.
3 printable pages
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