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Physics GCSE > p6 > Flashcards

p6 Flashcards

1
Q

what is density

A

an objects mass per unit volume

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2
Q

what objects will float on water

A

density is less than 1000kg/m cubed

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3
Q

is the mass of an object changed when it changes state

A

mass stays the same

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4
Q

why is density of gas lower than liquid

A

because its particles are much further apart

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5
Q

what is the changes of state from solid to gas

A

heating a solid to liquid is sublimation
cooling a gas to solid is condensation

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6
Q

what is the changes of state from gas to liquid

A

cooling a gas to liquid is condensation
heating a liquid to gas is vaporisation or boiling

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7
Q

what are the changes of state from liquid to solid

A

cooling a liquid to solid is solidifying or freezinf
heating a solid to liquid is melting

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8
Q

where and when does evaporation take place

A

on the surface of the liquid when the temperature is below its boiling point

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9
Q

what do impurities do to a substance

A

change the melting point and boiling point of a substance

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10
Q

what is latent heat

A

the energy transferred to or from the substance for it to change state

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11
Q

what do the flat Parts of graph for temperature against time represent

A

show the melting point and boiling point of a substance

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12
Q

does the temperature of the substance change when it is changing state

A

it does not change

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13
Q

what is internal energy

A

the total energy in the kinetic energy store and potential energy store of the particles in the substance

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14
Q

how do particles have potential energy

A

due to their individual positions relative to each other

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15
Q

what is specific latent heat of fusion

A

the energy needed to change 1kg of the substance from a solid to liquid with no change in temperature

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16
Q

what is specific latent heat of vaporisation

A

energy needed to change 1kg of the substance from a liquid to vapour with no change in temperature

17
Q

what happens if the temperature of the gas is constant

A

average speed of the gas molecule is constant

18
Q

what happens if the volume of a fixed mass of gas is reduced

A

molecules have less space so don’t travel as far between collisions
number of collision per second increases
press increases

19
Q

what is the equation for the relationship between pressure and volume

A

pressure x volume = constant

20
Q

what happens when a fixed mass of gas is compressed slowly

A

work must be done on it
energy is transferred by heating to the surrounding so internal energy and temperature doesn’t change

21
Q

what happens when a gas is compressed quickly

A

work done on the gas increases the internal energy and temperature of the gas because energy isn’t transferred quickly enough

Physics GCSE (31 decks)

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