Melting: melting points and freezing points | Science

Starter quiz

What are the three states of matter?
- Hot, Cold, Warm
- Water, Ice, Steam
- Solid, Liquid, Gas ✓
In which state of matter are particles in a fixed position and can only vibrate?
- Liquid state
- Gas state
- Solid state ✓
Which state of matter takes the shape of its container?
- Gas state
- Solid state
- Liquid state ✓
What is the temperature at which water freezes? ______ ℃ (enter only a number)
- '0' ✓
Arrange the following transitions in the order they would occur when heating a substance:
- 1
  
  ⇔
  
  The substance is in the solid state
- 2
  
  ⇔
  
  The substance melts
- 3
  
  ⇔
  
  The substance is in the liquid state
What is the primary reason that a substance in the solid state does not flow like a substance in the liquid state?
- The particles are too large
- The particles are too small
- The forces of attraction between particles are stronger ✓

Match each word to the correct statement
- liquid state
  
  ⇔
  
  particles fill the shape of the container ✓
- solid state
  
  ⇔
  
  particles are in a fixed position and can only vibrate ✓
- melting point
  
  ⇔
  
  temperature of a substance changing from a solid to liquid ✓
- freezing point
  
  ⇔
  
  temperature of a substance changing from a liquid to solid ✓
At what point is a substance in its solid state?
- Above its melting point
- Below its melting point ✓
- Above its freezing point
Arrange the following phases in the order they occur when a substance is cooled:
- 1
  
  ⇔
  
  The substance is in the liquid state
- 2
  
  ⇔
  
  The substance freezes
- 3
  
  ⇔
  
  The substance is in the solid state
The melting point and freezing point of a substance are ______.
- 'the same' ✓
If a substance has a melting point of 50°C, at what temperature will it freeze?
- -10°C
- 0°C
- 48°C
- 50°C ✓
- 100°C
A substance has a melting/freezing point of 25°C. If a sample of this substance is in a container at 25°C, which of the following statements is most accurate?
- The substance must be entirely in the solid state.
- The substance must be entirely in the liquid state.
- The substance could be in the solid or liquid state, or both simultaneously. ✓

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When it melts, a substance changes from the solid state to the liquid state.
When it freezes, a substance changes from the liquid state to the solid state.
At temperatures below its melting point, a substance is in its solid state.
At temperatures above its freezing point, a substance is in its liquid state.
The melting point and freezing point of a pure substance are the same temperature.

Some students can't understand that substances can change from one state to another state.

Ensure that the language used is solid state, liquid state and gas state, not solid, liquid and gas.

Liquid state - Substances in the liquid state will take the shape of their container.
Solid state - Particles in a substance in a solid state are in a fixed position and can only vibrate.
Melting point - The melting point of a substance is the temperature at which it changes from a solid state to a liquid state.
Freezing point - The freezing point is the temperature at which a substance changes from a liquid state to a solid state.