P1.2.2 Energy and temperature

• Q1. What is temperature?

  Temperature tells you how hot or cold something is.
• Q2. What can you use to measure temperature?

  A thermometer or temperature sensor
• Q3. What are the units to measure temperature?

  Degree celsius or Kelvin (K)
• Q4. What happens when you heat up water?

  You transfer energy from the chemical store of fuel to the thermal store of water. The Water particles move faster/vibrate more.
• Q5. Why isn't energy in a thermal store and temperature the same?

  • The energy in a thermal store is measured In joules. It depends on the arrangement of the particles and how fast they are moving/vibrating
  • Temperature tells you about the average kinetic energy of particles
• Q6. What happens when you heat things up?

  heating can:

  • Change the energy stored within the system to increase the temperature (having hot water for a shower)
  • Produce a change of state (ice melting in a drink)
  • Make chemical reactions happen (wood burning in a bonfire)
• Q7: What are changes of state an example of?

  Physical changes
• Q8. What's an example of a physical change?

  Dissolving
• Q9.

  You do not make new substances in a physical change.
• Q10. Are physical changes reversible?

  Yes
• Q11. Why are physical changes reversible?

  Because the particles are simply rearranged during a physical change
• Q12. Why is a physical change different to a chemical reaction?

  Chemical reactions , such as burning, involve joining atoms together in different ways. You cannot easily reverse a chemical change