# Density and changes of state

• Created by: Cat91
• Created on: 17-06-18 19:34
Which is heavier, a tonne of bricks or a tonne of feathers?
Both the same.
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Which is heavier, a kilogram of bricks or a kilogram of feathers?
Bricks.
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If two objects have the same volume do they also have the same mass?
No.
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Why does the same volume of something not mean the same mass?
Because of density being different.
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What does density tell us?
How much mass there is in a certain volume.
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Density =
Mass/volume
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P =
M/V
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What is density measured in?
Kilograms per metre (kg/m cubed)
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What is mass measured in?
Kilograms (kg)
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What is volume measured in?
Metres (m cubed)
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Can the density of an object be changed?
No.
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What can we use to compare the density of two materials?
A balance.
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What must we calculate before we can work out the density?
Mass and volume.
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How can we measure mass?
By using an electronic balance.
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How can we calculate the volume of regular shapes?
Just use the mathematic formula for it.
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How can we measure the volume of irregular objects?
Using a displacement can.
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Water displaced =
Final volume - starting volume.
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What can density be measured for?
Any material.
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What causes different densities?
The arrangement and mass of the particles that make them.
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What's a fancy word for heavy.
Dense.
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What is the general trend for density on the periodic table?
It usually increases going down, but not always.
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What sort of an arrangement are solids in?
A regular one.
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How do the particles in a solid move?
They vibrate.
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Name two things that having a regular shape means.
They keep their shape and they can't be compressed.
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How do liquids move?
They're close together and touch each other n=but move around randomly.
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Name three things about a liquid.
They take the shape of their container. They can be poured. They can't be compressed.
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How do gases move?
Quickly and freely.
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Name two things about gases.
They spread out to fill a container. They can be compressed.
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Which is densest, solids liquids or gases?
Solids.
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What is the exception to the 'solids are the most dense' rule?
Water, because ice has particles that are further apart than water does.
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What needs to happen to let an object change state?
It needs to be heated or cooled.
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When a substance changes state, what doesn't change?
The amount of particles, therefore the mass.
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What sort of reaction is a change of state?
Physical.
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If a reaction is physical, what does it mean?
That it's reversible.
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If a reaction is a chemical one, what does it mean?
That it's irreversible.
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## Other cards in this set

### Card 2

#### Front

Which is heavier, a kilogram of bricks or a kilogram of feathers?

Bricks.

### Card 3

#### Front

If two objects have the same volume do they also have the same mass?

### Card 4

#### Front

Why does the same volume of something not mean the same mass?

### Card 5

#### Front

What does density tell us?