Cooling curve: practical | Science | Quizalize & Oak National Academy

Starter quiz

Which of the following is the most appropriate way to show the change in temperature over time?
- Bar chart
- Pie chart
- Line graph ✓
The term used to describe the energy transfer from an object to its surroundings as it cools is...
- 'exothermic' ✓
True or false? In the gas state, particles have enough energy to move freely and are not held in fixed positions.
- 'true' ✓
What happens to the particles of a substance when it is heated and reaches its boiling point?
- They stop moving.
- They move closer together.
- They move further apart and move more quickly. ✓
- They change colour.
The temperature at which a substance changes from solid to liquid is known as its...
- 'melting point' ✓
Match the state of matter to the description about forces of attraction.
- substances in the solid state
  
  ⇔
  
  particles have the strongest forces of attraction ✓
- substances in the liquid state
  
  ⇔
  
  particles have some (weakened) forces of attraction ✓
- substances in the gas state
  
  ⇔
  
  particles have fully overcome forces of attraction ✓

On a heating curve, what does a plateau indicate?
- A temperature increase.
- A constant temperature during a state change. ✓
- An error in measurement.
- The substance is not changing state.
- The substance is no longer being heated.
The point on a cooling curve where a liquid starts to solidify is called the ______ point.
- 'freezing' ✓
How does energy transfer during the cooling of a substance?
- Energy is absorbed from the surroundings.
- Energy is released into the surroundings. ✓
- Energy remains constant in the substance.
Which state changes are shown in this heating curve?
- melting only
- melting and boiling ✓
- boiling only
- freezing only
- freezing and condensing
At what temperature (℃) does this substance begin to melt? (give only the number, not the unit)
- '20' ✓
Why does a substance's temperature not change during a phase transition, despite continued heating?
- Because the substance is losing energy.
- Because the energy is used to overcome forces of attraction. ✓
- Because the heating process stops temporarily.
- Because the temperature measurement is incorrect (an error in recording).

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State changes are visible as plateaus on cooling curves.
As it cools, a substance transfers energy into the surroundings by heating and it may condense or freeze.
Energy is released to the surroundings as a substance cools and this is observed as a decrease in substance temperature.
Graphs provide a visual representation of data for easier analysis and help identify trends/patterns.

All substances freeze when really cold, like water.

Show state changes using particle diagrams / kinetic energy model. Challenge pupils to identify state given real world temperature data.

Plateau - A plateau is a section of a graph that does not change value (stays at the same level for a period of time).
Melting point - The melting point of a substance is the temperature at which it changes from solid state to a liquid state.
Freezing - Freezing is the process of a substance changing from a liquid state to a solid state.
Temperature - Measured using a thermometer (commonly in °C). Temperature is an indirect measure of the energy of the particles in a substance.