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*AQA GCSE Physics* > 3. Particle Model Of Matter > Flashcards

3. Particle Model Of Matter Flashcards

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1
Q

What is SA?

A

Surface area

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2
Q

Equation for volume of a rectangle?

A

V=hxbxl

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3
Q

Equation for volume of a triangle?

A

V=1/2xbxlxh

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4
Q

Equation for volume of a cylinder.

A

V= 3.14 x r^2 x l

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5
Q

Equation for volume of a sphere?

A

V=4/3 3.14 r^3

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6
Q

Equation for density?

A

Density = mass/volume

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7
Q

How to measure volume of an irregular object?

A

Displacement method- Archimedes (displacement) can

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8
Q

Why do gas particles move more quickly?

A

They have more energy when heated

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9
Q

What happens when particles have a higher kinetic energy?

A

Greater average kinetic energy so faster average speed

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10
Q

Equation for pressure?

A

Pressure = force / area

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11
Q

What is pressure measured in?

A

N/cm2 or N/m2 (pascals)

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12
Q

What is the symbol for density?

A

Rho

ρ

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13
Q

What happens when molecules collide with the wall of a container?

A

They exert a force on the wall

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14
Q

What is the unit area?

A

The total force exerted by all the molecules

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15
Q

What does the pressure of a gas depend on?

A

mass of molecules

speed of molecules - hitting walls more often

how many molecules - more molecules to hit the walls

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16
Q

What happens when the volume of a gas decreases while the temperature stays the same?

A

The average speed stays the same but the molecules hit the walls more often

17
Q

What does Boyles law state?

A

The pressure of a fixed mass of gas at a constant temperature is inversely proportional to its volume

pV=constant

18
Q

pV=constant or…

A

p1V1=p2V2

19
Q

Why are things different densities?

A

some atoms might have more mass than others

some atoms may be smaller so more can fit in the same space

they might be arranged differently

20
Q

Equation for mass?

A

Density x volume

21
Q

Equation for distance?

A

Distance = speed x time

22
Q

Equation for force?

A

Force = pressure x area

23
Q

Equation for area?

A

Area = force / pressure

24
Q

Reasons for a difference in mass of the same volume?

A
  • some atoms may have more mass than others
  • some atoms may be smaller so more can fit
  • some atoms may be arranged different so more can fit
25
Q

What is the internal energy equation?

A

Kinetic energy (particle vibrations) + Potential energy (position of particles relative to each other)

*AQA GCSE Physics* (10 decks)

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