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22 Cards in this Set
- Front
- Back
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Properties of a solid? |
- Particles tightly packed - They vibrate -Do not flow easily -Fixed shape -Don't compress easily |
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Properties of a liquid? |
-close together with no regular arrangement. -liquid vibrate, move about, and slide past each other. -is the shape of the container it is in -not easily compressible Can flow |
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Properties of gas? |
-Is the shape of it's container it's in -Compressible -Flows easily -Well separated particles -move freely at high speeds |
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How does evaporation work? |
Particles gain heat energy which allows them to turn into a gas. |
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How does temperature effect evaporation? |
water molecules increase more rapidly |
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How does surface area effect evaporation? |
This is because evaporation occurs among the molecules on the surface, not in the interior. This means; increasing the surface area will increase the chance of more molecules to evaporate.
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How is evaporation affected by air flow? |
Increases evaporation |
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How is evaporation related to consequent cooling? |
Feels cooler as the evaporation takes thermal energy away. |
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Describe the thermal expansion of liquids, solids and gases |
Solid-The relative increase in the size of solids when heated is small. Liquid-An increase in temperature results in the expansion of the liquid which means it rises up the glass. Gas-the volume of a gas increases more than the volume of a solid or liquid when heated. |
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Name some everyday examples of thermal expansion. |
Railtracks expand when heated |
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How does the change of temperature effect pressure? |
As the temperature increases, the molecules in the gas move faster, impacting the gas's container more frequently and exerting a greater force. This increases the pressure.
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What is thermal capacity? |
the amount of heat required to change the temperature of an object by a certain degree.
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what is the equation for energy? |
Energy = mass × specific heat capacity × change in temperature
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Describe melting and boiling in termsof energy input without a change intemperature
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During melting/boiling, temperature is kept constant, but energy is being transferred. Bonds are being broken and formed, which requires energy to transfer. Potential energy increases, while kinetic energy stays the same.
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What is the difference between boiling and evaporation? |
Evaporation: particles escaping at the surfaceBoiling: vapour bubbles forming in the liquid and bursting when it reaches the top
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What is condensation? |
gas to liquid
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What is solidification? |
Liquid to solid |
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What is Latent heat of vaporisation? |
Heat needed to make liquid into a gas
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What is Latent heat of fusion? |
Heat needed to make a solid into a liquid
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What is Molecular interpretation of latent heat?
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When a substance is heated, particles will gain energy and break the force holding them together, changing states
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What is boiling point? |
The time at which boiling bubbles turn to vapour. |
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What is melting point? |
When a given solid will melt |
