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1

three states of matter:

solid
liquid
gases

2

SOLIDS

in a solid:
-particles are in a fixed pattern (lattice)
-fixes size & shape

3

LIQUIDS

in a liquid:
-fixed size
-free to move particles
-change shape

4

GASES

in gases:
-large gaps between particles
-compressible
-change size & shape

5

density equation=

Density= mass
————
volume

6

what happens when energy is added to a system?

when energy is added to a system its temperature will increase

7

what happens at the melting or boiling point?

At the melting or boiling point,
the energy being added causes a substance changes state not temperature

8

is a change of state reversible?

yes it is baby

9

what type of change is a change of state?

A change of state is a PHYSICAL change
- alters the internal energy but not the temperature or mass

10

equation for change of state =

energy for
change = mass x specific latent heat
of state

11

what is specific latent heat?

specific latent heat is the energy needed to cause 1 kg of a substance to change its state

12

what is latent heat of fusion?

Latent heat of fusion is the energy needed for substance to change from solid to a liquid (melt)

13

What is latent heat of vaporisation?

Latent heat of vaporisation is the energy needed for a substance to change from liquid to gas (evaporate)

14

what is sublimation?

sublimation is when a substance changes from a solid to a gas without having a liquid phase in the middle

15

when did sublimation happen?

sublimation happens when substances have a boiling point that is the same or lower than the melting point

16

why does an increase in temperature affect the pressure in gas?

Increasing the temperature increases the speed of the particles.
This increases the frequency and force with which the particles hit the walls and increases the pressure.