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Chemistry y8 eoy > everything > Flashcards

everything Flashcards

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1
Q

how many elements are there

A

There are over 100 different
elements (118)

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2
Q

what are elements made from

A

atoms

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3
Q

whats a molecule

A

two or more atoms (same element) strongly bonded together

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4
Q

week acid ph numbers

A

4-6

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5
Q

strong acid ph numbers

A

1-3

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6
Q

nutreal ph number

A

7

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7
Q

week alkali ph number

A

8-11

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8
Q

strong alkali ph number

A

12-14

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9
Q

whats distillation

A

method used to separate different substances in a mixture by heating and cooling them.

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10
Q

whats filtration

A

filtering insoluble solid from liquid or gas using filter paper

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11
Q

whats chromotography

A

separation technique used to separate mixtures of soluble substances.

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12
Q

what side are metals on periodic table

A

left

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13
Q

what side are non-metals on periodic table

A

right

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14
Q

whats a element

A

substance made from same type of atoms on the periodic table

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15
Q

whats a compound

A

different types of elements (there atoms) have chemically bonded

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16
Q

whats a mixture

A

substance made when elements mix together but dont chemically bond.

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17
Q

colours of ph 1-3

A

shades of red

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18
Q

colours of ph 4-6

A

shades of orange and yellow

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19
Q

colour of ph 7

A

green

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20
Q

colours of ph 8-11

A

shades of blue

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21
Q

colours of ph 12-14

A

shades of indigo and purple

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22
Q

which way do periods go on table

A

horizontal left right

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23
Q

which way do groups go on table

A

vertical up down

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24
Q

how many groups in periodic table

A

18

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25
Q

how many periods in the periodic table

A

7

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26
Q

does reactivity increase or decrease down group 1

A

increases

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27
Q

what is a alkali (explain) + its purpose

A

A chemical that can dissolve in water, combine with acids to form salts, and make acids less acidic. Alkalis have a bitter taste

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28
Q

3 examples of lab alkali

A

Sodium hydroxide.
Potassium hydroxide.
Calcium hydroxide

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29
Q

3 examples of home acids

A

lactic acid
acetic acid
citric acid

30
Q

what is Nacl

A

Sodium chloride (table salt)

31
Q

what is the structure of an atom
draw it or imagine

A

electrons orbiting the nucleus ( protons and neutrons )

32
Q

different between molecule and atom

A

molecule has more than one atoms bonded strongly whereas atoms are the smallest units of element

33
Q

What makes a salt

A

when a acid reacts with a BASE

34
Q

give me a example of a salt being formed

A

eg sodium hydroxide + nitric acid ➡️ sodium nitrate

35
Q

What group is halogens

A

Group 17

36
Q

do halogens get more reactive downwards or less reactive ⬇️

A

less reactive ⬇️

37
Q

are halogens solid liquid or gas

A

all 3.
Gasses : F2, Cl2 (little 2)
liquids :Br2 (little 2)
solids I2 (little 2)

38
Q

Chemical properties of metals

A

react with acids to make salts and hydrogen gas.
form positive ions because loss of electrons in chemical reactions

39
Q

physical properties of metals

A

shiny
malleable
solid at room temp (most except mercury which is a liquid)

40
Q

chemical properties of non metals

A

•formation of negative ions due to loss of protons in chemical reactions.
•reactivity with oxygen to form acidic or neutral oxides.

41
Q

physical properties of non metals

A

•dull
•brittle when solid
•poor conductors of head and energy except graphite

42
Q

what is formed when burning metals and non metals in oxygen

A

compounds called oxides

43
Q

what do metal oxides act like

A

alkalis

44
Q

non metals dissolve in water to make…

A

acidic solution

45
Q

metal + ? ➡️ metal oxide

A

oxygen

46
Q

base + water ➡️ ?

A

alkali

47
Q

what is alkali

A

a base that dissolves in water

48
Q

what is a base

A

a substance that can neutralise acids

49
Q

non metals are often ?? (s l g)

A

gasses

50
Q

hydrochloric acid is called ??? after reaction

A

chloride

51
Q

nitrate is called ??? before reaction

A

nitric acid

52
Q

sulphate is called ??? before reaction

A

sulphuric acid

53
Q

when there is a ??? you add + carbon dioxide in a equation

A

carbonate

54
Q

reactivity increases/ decreases down the alkali metals group

A

increases

55
Q

some properties of alkali metals group 1 are…

A

very reactive
soft
low melting pint
low density

56
Q

what do group 1 alkalis form when reacted with water

A

hydroxides

57
Q

what do group 1 alkalis form when reacted with oxygen

A

oxides

58
Q

…. can be used for batteries

A

lithium

59
Q

soluble means…

A

can be dissolved in solvent

60
Q

insoluble means…

A

cannot be dissolved in solvent

61
Q

solvent means..

A

the liquid that the solute is being dissolved into

62
Q

solute means…

A

the substance dissolved in solution or solvent

63
Q

do solids get more or less soluble as temperature goes up

A

more soluble

64
Q

do gasses get more or less soluble as the temperature increases

A

less soluble

65
Q

solution is..

A

Solvent + solute

66
Q

what are pure substances

A

made from only one compound or element eg helium or sodium chloride

67
Q

what are impure substances

A

made from more than one element or compound eg air or seawater

68
Q

what separation technique can make a impure substance go pure

A

distillation

69
Q

what is another word for neutralisation

A

titration

70
Q

3 examples of home alkalis

A

sodium bicarbonate
sodium carbonate
ammonia solution

71
Q

3 examples of lab acids

A

sulphuric acid
nitric acid
hydrochloric acid

Chemistry y8 eoy (2 decks)

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