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5715302
C1_states, p&s changes + particles
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chem.uno
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chemistry
science
all topics.
7
Mapa Mental por
eleanor ayeni
, atualizado more than 1 year ago
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Criado por
eleanor ayeni
mais de 8 anos atrás
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C1_states, p&s changes + particles
physical & chemical changes
physical = a change when a substance changes ate shape or breaks
e.g. heating
How do you know its a physical change?
~ The opposite of all the chemical changes.
~ it is reversible
~ It can be separated.
chemical = a change that produces one or more new substances.
eg. burning
How do you know its a chemical change?
~ The colour of the product will change.
~ Bubbles of gas appear
~ The temperature changes.
~There's light given offf
solid, liquid and gas.
solid
has a definite shape
has a definite volume
cannot be compressed
it cant flow.
the particles have a fixed shape, and pattern
they can only vibrate.
liquid.
it cant be squashed
it can flow
it doesn't have a definite shape
its volume is definite
the particles are arranged randomly
liquid particles touch each other
gas.
no definite shape
no fixed volume
takes the shape of a container
can be compressed
particles are randomly arranged
move around freely
large spaces in-between particles
limitations of particle model.
doesn't account for........
the size of the particles
the electro-static forces between the particles
the distance between the paricles
How do you work out the ratio of the distance between the particles.
distance/diameter
*you will be given the distance and diameter
e.g. 3.4x10-9/0.2x10-11=0.55x10^2
remember, the diameter is double the radius.
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