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Science yr8 Term 3 Unit 1.3 Energy Losses
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- 1What are the laws of thermodynamics?The laws that describe the way in which energy moves
- 2What does thermos and dynamic refer to?Thermo: heat
Dynamics: movement - 3What are the 3 laws of thermodynamics?1. Energy can neither be created nor destroyed; it can only change form.
2. Heat can flow from a high temperature region to a low temperature region but not the other way round.
3. As temperature moves towards absolute zero, particle movement approaches a minimum. - 4What is absolute zero and what happens to particle movement at this temperature?It is the lowest possible temperature as at this temperature particle movement completely dies out.
- 5Explain how energy changes form in a car using a flowchartChemical potential energy ---> Kinetic energy----> Heat energy
- 6How does energy change form in photosynthesis?Solar energy---> Chemical potential energy ----> Heat energy
- 7Show a diagram which shows how a fridge removes heat from inside to the outside
- 8How do materials go from gases to liquids?Energy is removed from the gas; thus, the particle movement in gas cools down and start attaching themselves together making them liquid..
- 9What happens when a solid is cooled even further?The particle movement gets slower and slower.
- 10Why can we not reach absolute zero?Because it would then break the second law of thermodynamics and is the third law of thermodynamic.
- 11Can energy transformation be 100% percent efficient?Yes and no (to get 100% efficiency, the transfer needs to occur at absolute zero, which is impossible to reach)
- 12Why is energy transformation not 100% efficient?This is because heat energy is always produced during an energy transfer
- 13What gets produced when fuel is burned?Heat energy is produced
- 14How efficient is a normal car and where does the rest of the energy go?Approx. 20% ( The rest usually goes in either heat energy and sound energy)
- 15Why is energy efficiency important?Energy efficiency means using less energy to accomplish the same task.
- 16What is lost at every energy transformation?Energy is lost due to heat energy being produced (most of the time).
- 17What happens to materials when they go from a very high temperature to very low temperatures?Energy is lost?
- 18Thanks for readingThanks for reading
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- Fichas sobre Science yr8 Term 3 Unit 1.3 Energy Losses , creado por afiq abdillah el 27/10/2016.
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