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16 Cards in this Set
- Front
- Back
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Energy is measured in.. |
Joules (J) |
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Can energy appear/disappear? |
No. When anything happens, energy is transferred from one place to another. |
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What type of surfaces are the best at absorbing infrared radiation? |
Black matt surfaces |
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What type of surfaces are better at reflecting infrared radiation? |
Shiny light coloured surfaces |
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What happens to an object if infrared radiation is emitted faster than it is absorbed? |
The object cools down |
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What happens to an object if infrared radiation is absorbed faster than it is emitted? |
The object warms up |
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Why are metals are good conductors? |
Electrons in metals are free to move rapidly from hotter to colder regions, transferring energy. |
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Describe the process of conduction (HINT: refer to particles) |
If one end of a solid is heated, particles vibrate more and shake their neighbours. Conduction transfers energy from one particle to another through the solid. |
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Describe the process of convection (HINT: refer to particles)
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If one part of a liquid or gas is warmed, the particles vibrate more taking up more space. The warm region of gas or liquid expands, becoming less dense and rising above cooler denser regions. |
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What do convection currents do? |
Convection currents spread heat through liquids or gases that are heated from the base, or cooled from the top. |
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Describe what happens when something melts. Refer to particles. |
Melting is when a solid changes to a liquid. When the solid is heated, particles vibrate more vigorously. Bonds between particles break and reform so particles can change places. |
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Describe what happens when something is boiled. |
Boiling is when a liquid changes to a gas when the liquid is heated. The particles gain more kinetic energy, break their bonds and move around randomly. |
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Describe the arrangement of particles in a solid. |
In solids, particles vibrate and are held together by strong bonds. |
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Describe the arrangement of particles in a liquid.
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In liquids, particles move around each other but cannot escape due to weak bonds. |
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Describe the arrangement of particles in a gas.
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In gases, particles move randomly as the bonds are very weak. |
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Describe a theory involving global warming and infrared radiation. |
One theory is that the sea water s dark coloured and will absorb infrared radiation from the sun faster than ice does |
