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Ty Phy Sci Ch 10
Heat and Heat Technology
| Question | Answer |
|---|---|
| a measure of the average kinetic energy of the particles in an object | temperature |
| the increase in volume of a substance due to an increase in temperature | thermal expansion |
| the lowest possible temperature (0 K, -273 C) | absolute zero |
| How do you convert C temperature to F temperature? | F=(9/5 x C)+32 |
| Why do you think heating a full pot of soup on the stove could cause the soup to overflow? | Due to thermal expansion, the volume of the soup will expand as it gets hotter, causing it to overflow the pot |
| the transfer of energy between objects that are at different temperatures | heat |
| the total energy of the particles that make upa substance | thermal energy |
| the transfer of thermal energy from one substance to another through direct contact | conduction |
| substances that conduct thermal energy very well | conductor |
| substances that do not conduct thermal energy very well | insulator |
| the transfer of thermal energy by the movement of a liquid or gas | convection |
| the trasfer of energy through matter or space as electromagnetic waves, such as visible light and infrared waves | radiation |
| the amount of energy needed to change the temperature of 1 kg of a substance by 1 C. | specific heat capacity |
| Explain how radiation is different from conduction and convection. | it does not require a transfer of energy through particles of matter |
| Why do many metal cooking utensils have wooden handles? | the metal conducts the heat while the wood is an insulator to keep you from burning your hand |
| How are temperature and heat different? | temperature is the average kinetic energy of particles in a substace while heat os the transfer of energy between objects of differnt temperatures |
| the physical forms in which a substance can exist | states of matter |
| the conversion of a substance from one physical form to another | change of state |
| During a change of state, why doesn't the temperature of the substance change? | energy added to or taken away from a substance during a change of state rearranges the particles of the substance rather than altering the temperature |
| When water evaporates (changes from a liquid to a gas), the air near the water's surface becomes cooler. Why? | For water to evaporate, it must absorb energy. The air near the surface of the water transfers energy to the water causing the air to become cooler |
| Many cold packs used for sports injuries are activsated by bending the package, causing the substances inside to interact. How is heat involved in this process? | The interaction of the substances absorbs so much energy, it causes the pack to feel colder. |
| a substance that reduces the transfer of thermal energy | insulation |
| a machine that uses heat to do work | heat engine |
| the excessive heating of a body of water | thermal pollution |
| What is the difference between an external combustion engine and an internal combustion engine? | An external combustion engine burns fuel on the outside and an internal combustion engine burns fuel on the inside |
Created by:
beth2244
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