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Flashcards in Heat Deck (10)
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1

what are the properties of a solid?

strong intermolecular bonds

tight spacing, a regular arrangement and a rigid structure

vibrates in a fixed position

low KE, high PE

2

what are the properties of a liquid?

weak intermolecular bonds

more movement and vibration

can pass eachother

more KE then a solid, less PE

3

what are the properties of a gas?

large amounts of space

particles move randomly

no bonding

high KE, low PE

4

conduction key points

works best in solids

happens faster in a metal because there are delocalised electrons

gasses are good insulators

solids that trap gasses are the best insulators

5

conevection key points

warm water displaces cold water because it is less dense, vice versa

in a fridge:
-air near cooling element is warm but cools
-becomes less dense and sinks

6

condensation key points

energy is transferred from gas to surface, KE decreases and bonds form, PE increases

reduce condensation by warming the surface that it reaches

7

evaporation key points

particles with most energy rise

particles near surface have enough energy to break bonds and evaporate

8

what are the factors that affect evaporation?

heat - more particles have sufficient energy to break bonds

SA - more particles at surface

movement of air - area becomes saturated with particles, air moves particles from surface

9

why does an evaporating liquid cool?

highest energy particles evaporate

average KE of particles decreases

10

specific heat capacity

amount of energy required to change 1kg of a substance by 1°c

the unites a J/kg°c