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Science KS3 > particles and the periodic table > Flashcards

particles and the periodic table Flashcards

1
Q

what are the three states of matter

A

solid, liquid, gas

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2
Q

can a liquid be compressed

A

no

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3
Q

can a gas be compressed

A

yes

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4
Q

what is condensation

A

when gas changes into a liquid

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5
Q

what is freezing

A

a liquid turning to a solid

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6
Q

what is melting

A

a solid turning into a liquid

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7
Q

what is evaporation

A

a liquid turning into a gas

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8
Q

what is the melting point of a substance

A

the temperature at which a substance changes from a solid to a liquid

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9
Q

what is the boiling point of a substance

A

the temp at which a substance changes from a liquid to a gas

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10
Q

what is diffusion

A

the movement of particles from an area of higher concentration to an area of lower concentration

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11
Q

what is the difference between a compound and a mixture

A

compound - 2 or more elements chemically bonded together (e.g. CO2, H2O)
mixture - 2 or more elements or compounds mixed together but not chemically bonded (e.g. air, sea water)

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12
Q

what needs to be done to a substance for it to change state

A

heat energy needs to be transferred to it or removed from it

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13
Q

explain how heating a liquid causes it to change into gas (evaporate)

A

transferring heat energy to the particles, making them move faster so they move further apart. the liquid changes into a gas

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14
Q

explain how cooling a liquid causes it to change into a solid (freezing)

A

removing heat energy from the particles, making them move around less making them end up closer together. the liquid changes into a solid

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15
Q

does every substance have the same melting and boiling point

A

false

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16
Q

what are the melting and boiling points of water

A

melting = 0 degrees C
boiling = 100 degrees C

17
Q

what states of matter do diffusion occur in

A

liquid and gas, not solids

18
Q

when does diffusion stop

A

when the particles are spread out evenly

19
Q

what is expansion

A

expansion of a substance occurs when it is heated. its particles spread out , making the substance take up more volume

20
Q

what is contraction

A

contraction of a substance occurs when it is cooled. Its particles move closer together making the substance take up less volume

21
Q

what is an element

A

substance containing only one type of atom e.g. carbon (C) , oxygen (O2)

22
Q

what do elements in the same group have in common

A

they have similar properties

Science KS3 (15 decks)

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