Starter quiz
- What is the state of matter where particles are closely packed in a fixed arrangement?
- Solid state ✓
- Liquid state
- Gas state
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- Which of the following is a common temperature measurement tool?
- barometer
- thermometer ✓
- ruler
- calliper
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- Arrange the following states of matter, based on the freedom of particle movement (from least to most):
- 1⇔solid state
- 2⇔liquid state
- 3⇔gas state
- Match the states of matter with their particle arrangements:
- Regular arrangement⇔Solid state ✓
- Random arrangement⇔Liquid state ✓
- No fixed arrangement⇔Gas state ✓
- Fill in the blank: The change of a substance from solid state to liquid state is called ______.
- 'melting' ✓
- Fill in the blank: In solids, the ______ hold the particles together.
- 'forces of attraction' ✓
Exit quiz
- What happens to the arrangement of particles when a substance changes from the solid state to the liquid state?
- They arrange in a fixed pattern
- They move from a regular arrangement to a random arrangement ✓
- They compress into a smaller space
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- Fill in the blank: At room temperature, water is in the ______ state.
- 'liquid' ✓
- Which description best fits the term 'regular arrangement'?
- Particles are free to move around
- Particles are in fixed positions relative to each other ✓
- Particles are spread far apart
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- Arrange the following based on their melting points from lowest to highest:
- 1⇔Substance with weak forces of attraction between particles
- 2⇔Substance with moderate forces of attraction between particles
- 3⇔Substance with strong forces of attraction between particles
- The melting point is a particular ______ at which a substance changes from the solid state to the liquid state.
- 'temperature' ✓
- Why is the bulb of a thermometer made of very thin glass?
- To allow it to float on water
- To enable heat to pass through quickly ✓
- To make it colourful
- To reduce costs in manufacturing
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Worksheet
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Presentation
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Lesson Details
Key learning points
- In the solid state, forces of attraction between particles hold them in fixed positions.
- In the liquid state, particles are held together but have enough energy to break free to move around.
- The stronger the force of attraction between particles in a substance, the higher its melting point.
- Water freezes at 0℃, room temperature is about 20℃ and body temperature is about 37℃.
- The bulb of a thermometer is made of very thin glass and is delicate.
Common misconception
Particle spacing can be overemphasised at the expense of particle movement.
Ensure students understand that although particles can move over each other, the forces of attraction mean that the particles are touching.
Keywords
Melting - Melting is when a substance changes from a solid state to a liquid state.
Melting point - The melting point of a substance is the temperature at which it changes from solid state to a liquid state.
Forces of attraction - Forces of attraction hold particles together.
Regular arrangement - In a solid state the particles are in a regular arrangement.
Random arrangement - In a liquid state the particles are in a random arrangement.
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