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Description
Flashcards by afiq abdillah, updated more than 1 year ago
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Created by afiq abdillah
over 7 years ago
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| Question | Answer |
| What are the laws of thermodynamics? | The laws that describe the way in which energy moves |
| What does thermos and dynamic refer to? | Thermo: heat Dynamics: movement |
| What 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. |
| What 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. |
| Explain how energy changes form in a car using a flowchart | Chemical potential energy ---> Kinetic energy----> Heat energy |
| How does energy change form in photosynthesis? | Solar energy---> Chemical potential energy ----> Heat energy |
| Show a diagram which shows how a fridge removes heat from inside to the outside | |
| How 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.. |
| What happens when a solid is cooled even further? | The particle movement gets slower and slower. |
| Why can we not reach absolute zero? | Because it would then break the second law of thermodynamics and is the third law of thermodynamic. |
| Can 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) |
| Why is energy transformation not 100% efficient? | This is because heat energy is always produced during an energy transfer |
| What gets produced when fuel is burned? | Heat energy is produced |
| How 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) |
| Why is energy efficiency important? | Energy efficiency means using less energy to accomplish the same task. |
| What is lost at every energy transformation? | Energy is lost due to heat energy being produced (most of the time). |
| What happens to materials when they go from a very high temperature to very low temperatures? | Energy is lost? |
| Thanks for reading | Thanks for reading |
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