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6 Cards in this Set
- Front
- Back
Whats the Brownian motion |
This is the erratic motion of the microscopic particles due to the random impacts of gas molecules on each particle |
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Why increasing the temperature of a gas increases its pressure |
This is because the average ke of the gas molecules increases when the gas is heated. As a result the average speed of the molecules also increases. They will hot the surface harder and more often so it will therefore increase the pressure |
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Who observed the Brownian motion |
Robert brown |
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Why smoke particles in air move erratically |
This is because of the random impacts ot the gas molecules on each one |
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Explain cooling by evaporation |
When a liquid evaporates, it becomes cooler. Molecules with enough ke break ays form the attraction of other rmolecl and escape from the liquid. After they escape, the average ke of the remaining molecules decreases so the liquid becomes cooler. |
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Factors affecting evaporation |
1) temperature 2) surface area 3) creating a draught of air across the liquid surface |
