t3 test Flashcards

1
Q

density equation

A

density = mass / volume

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2
Q

mass, volume, density

A

kg
m^3
kg/m^3

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3
Q

The internal energy of the air increases as the tyre is
inflated.

explain why

A

work is done in the
tyre

so the temperature
increases

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4
Q

If the gas is compressed too
quickly the temperature of the gas increases.

Explain how the temperature
increase would affect the
pressure exerted by the gas.

A

a temperature increase would increase the pressure in the tube

higher temperature
would mean higher kinetic energy of particles

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5
Q

polystryene

A

solid, low density, very open structure and is full of air spaces

small mass for its volume

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6
Q

specific heat capacity

A

amount of energy required to raise the temp of 1kg of a substance by 1C

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7
Q

change in energy

A

Change in energy (J) = mass (kg) x SHC (J/kgC) x change in temperature (C)

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8
Q

specific latent heat

A

energy needed to change the state of 1kg of a substance

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9
Q

energy equation

A

Energy (j) = mass (kg) x specific latent heat (J/kg)

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10
Q

specific latent heat of fusion

A

energy required to change 1kg of a substance from solid to liquid with no change in temp

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11
Q

energy for change of state

A

= mass x SLH

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12
Q

solids

A
  • particles are very close together
  • arranged in a regular pattern
  • vibrate but don’t move place to place
  • v high density as particles are packed closely, lot of mass for their volume
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13
Q

liquids

A
  • close together
  • can move around each other
  • high density since particles are close together, lot of mass for their volume
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14
Q

gases

A
  • particles very far apart
  • not arranged in any pattern
  • in constant random motion
  • low density as particles are very far apart so have a small mass for their volume
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15
Q

displacement reaction

A
  • fill a eureka can with water
  • place object into water, water becomes displaced and flows out of the can through the spout
  • measure the volume of water displaced
  • volume is the same as the volume of the object
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16
Q

internal energy

A

energy stored in a system by the particles

17
Q

what does internal energy include

A

KE of particles and potential energy of the particles

18
Q

work

A

transfer of energy by a force

19
Q

why physical changes

A

reversing changes makes the material recover original properties