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P1 (1) (Energy (Storing and transferring energy (Everything stores energy,…
P1 (1)
Energy
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Evaporation and pressure
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In a chemical reaction, the mass of chemicals before and after is the same, but the amount of energy is different
Infrared Radiation
Global warming
Many things affect the rate of global warming. For example, the sea water is dark colored and will absorb infrared radiation from the sun faster than ice.
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Kinetic theory
Particles
In gases, particles move randomly as the bonds a very weak
In solids, particles vibrate and are held together by strong bonds
In liquids, particles move around each other but cannot escape due to weak bonds
Bonds between particles
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Melting is when a solid changes to a liquid. When a solid is heated, particles vibrate more vigorously. Bonds between particles break and reform so particles can change places
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Boiling is when a liquid changes to a gas when the liquid is heated. The particles break their bonds and can move randomly
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Insulating Buildings
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The energy needed to manufacture and install insulation should be less than the energy saved by using it
Specific Heat Capacity
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Oil filled radiators
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They reach higher temperature with still using the same amount of energy compared to water filled radiators
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Rate of Energy tranfer
Conduction, Infrared radiation and Convection
When hot objects cool, energy is transferred to the surface by conduction and from the surface by convection.Hotter objects lose energy more quickly than cool objects
The ratio of surface area to volume affects the rate of heat loss. If the surface area is larger, energy is transferred quicker from the object
