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Chemistry > c1.1 - the particle model > Flashcards

c1.1 - the particle model Flashcards

particles

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1
Q

what are particles?

A

Tiny bits of matter

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2
Q

what is a solid to a liquid called?

A

melting

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3
Q

what is a liquid to a gas called?

A

evaporation

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4
Q

what is a gas to liquid called?

A

condensation

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5
Q

what is a liquid to a solid called?

A

freezing

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6
Q

what is a solid to a gas called?

A

sublimation e.g. dry ice

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7
Q

what is a gas to a solid called?

A

deposition

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8
Q

what are the arrangements of particles?

A

solid- regular
liquid- random
gas- random

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9
Q

what is the relative difference between particles?

A

solid- close together
liquid- close together but moves a lot
gas- further away and moves a lot

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10
Q

what is the main movement of particles?

A

solid- vibration
liquid- move around each other
gas- moves in all directions

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11
Q

what do intermolecular forces of attraction hold together?

A

holds molecules together and breaks when liquids evaporate

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12
Q

what do chemical bonds hold together?

A

holds atoms together and breaks in a chemical reaction

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13
Q

what does the the particle model not take into account?

A

the force between particles
the size of particles
the space between particles

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14
Q

what are elements made up of?

A

tiny particles called atoms

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15
Q

what is the smallest atom?

A

helium

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16
Q

what are the electrostatic forces of attraction between?

A

positively charged particles and negatively charged particles

17
Q

what happens the further particles are apart?

A

the forces get weaker

18
Q

where are the forces stronger?

A

solids

19
Q

how do you know if it is a chemical change?

A

always forms a new substance
releases heat and odours
changes colours
cant be undone
effervescence
precipitation
energy chance
e.g. fireworks exploding

20
Q

how do you know if it is a physical change?

A

size increasing or decreasing
can be undone
e.g. melting choclate

21
Q

how can you describe chemical change?

A

word equations or symbol equations

22
Q

what does physical change mean?

A

no new substances are made but there is a change in the appearance of a substance

23
Q

what are 3 examples of a chemical change?

A

burning petrol
lighting a match
toast burning

24
Q

what are 3 examples of a physical change

A

melting salt
nail varnish drying
puddles evaporating

Chemistry (5 decks)

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