molecules and matter Flashcards

1
Q

what is density

A

mass at a given volume, how packed something is w particles

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2
Q

density equation

A

mass

density x volume

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3
Q

how to find volume of water

A

measure mass of beaker before and after water is added and subtract

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4
Q

explain required practical 5 density

A

so you find the mass of an object like normal but if its an odd shape the volume is hard to determine. you get a eureka can of water with a spout, when you add the object water will be displaced through the spout and the volume of the displaced water is equal to the vol of the object

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5
Q

what happens to particles when state chnges

A

though their positions change they do not gain or lose any so they dont change mass

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6
Q

what is latent heat

A

energy needed to change 1kg of a substances state w no change in temp

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7
Q

what is the dif between boiling and evapourating

A

boiling is a fixed temp when bubbles are formed inside the liquid that rise to become a gas
evapouration happens only at the surface under the boiling point

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8
Q

what does fusion describe

A

melting when two dif solids are ‘fused’ together

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9
Q

whats internal energy

A

total kinetic and pot energy stored by particles in a system- their movement and their potential due to their relations to eachother NOT grav pot and the objects kinetic

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10
Q

what is the energy change in temo equation

A

e =
mass x c (heat capacity) x change in temp

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11
Q

whe a substance is heated…

A

internal energy increases as theres more kinetic between particles

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12
Q

how does pressure of a gas increase

A

they gain speed from heat and so hit the surface more rapidly and so speed the number of impacts per sec

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13
Q

what is latent heat of fusion

A

energy needed to melt/ boil 1kg of a subsatnce froma solid to a liquid w no temp change

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14
Q

latent heat equation

A

energy

mass x latent heat

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15
Q

what is latent heat of vapourisation

A

energy needed to change the state (by breaking bonds) of 1kg of substnace from liquid to a vapour with no temp change

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16
Q

what happens to latent heat after substance condenses/ solidies

A

transferred to thesurroudnings as they form new bonds

17
Q

whats gas presssure caused by

A

the collisions of the random fast moving particles with the container