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year 7 end of years > End Of Year Chemistry > Flashcards

End Of Year Chemistry Flashcards

1
Q

What number does the ph scale go from

A

0 to 14

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2
Q

Anything with a ph below 7 is an…

A

Acid

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3
Q

The strongest acid has a ph of what

A

0

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4
Q

Anything with a above 7 is an…

A

Alkali or a base

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5
Q

That strangest alkali has a ph of…

A

14

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6
Q

What is an indicator

A

Something that changes colour depending of whether it is an acid or an alkali

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7
Q

What is a popular indicator

A

Litmus paper

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8
Q

What colour do acids turn on litmus paper

A

Red

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9
Q

What colour does alkalis turn on litmus paper

A

Blue

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10
Q

What is a universal indicator

A

A solution that is a very useful mixture of dyes which gives the colours shown in a ph chart

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11
Q

Is sulphuric acid an acid or an alkali and is it strong or weak

A

It is an acid and it is strong

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12
Q

Is acid rain a strong or weak acid

A

Weak

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13
Q

What is water in the ph scale

A

7- neutral

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14
Q

Is sodium hydroxide an acid or an alkali and is it strong or weak

A

An alkali and it is strong

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15
Q

Acids react with alkalis to form a what

A

A neutral solution

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16
Q

What do the ph scale show

A

The strength of acid and alkalis

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17
Q

What is chemistry

A

The study of reactions and structure of particles and molecules

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18
Q

True or false there is an inner and outer cone on a flame

A

True

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19
Q

What is it called that the Bunsen burner sits on

A

Heat resistant tile

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20
Q

How many types of flames are there

A

3

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21
Q

What are the types of flames

A

Safety flame blue flame and roaring flame

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22
Q

What temp does water boil at

A

100 degrees

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23
Q

Salt water boiled at what temp

A

105 degrees

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24
Q

Does ink have a higher or lower boiling point than water

A

Ink had a higher boiling point

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25
Q

What is crude oil

A

It is a thick black viscous liquid that floats on water

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26
Q

What is oil composed of

A

A very large mixture of hydrocarbons

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27
Q

What does oil refining involve

A

The separation of these hydrocarbons into mixtures (fractions)

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28
Q

Can liquids in a mixture be separated

A

Yes if they have different boiling points

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29
Q

What is light gasoline used for

A

Petrol

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30
Q

What is naphtha used for

A

Petrol and white spirits

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31
Q

Kerosene is used for what

A

Jet fuel paraffin

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32
Q

What is gas fuel for

A

Diesel central heating oil

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33
Q

What is distillation

A

The separation of liquids with multiple boiling points this liquid is often crude oil

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34
Q

What is distillation

A

The separation of liquids based on their boiling points

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35
Q

What is are 2 advantage of oil

A

It is found in many places in the world and crude oil is separated into many components each of which has a use

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36
Q

State 2 disadvantages of oil

A

Accidents such as oil spills occur and much of our oil had to be imported

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37
Q

How can you separate two or more soluble solids of a solution

A

Distill and evaporation

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38
Q

What are compounds

A

Chemicals made from atoms of different elements joined by chemical bonds. They can only be separated by a chemical reaction

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39
Q

What is a mixture

A

Is made from molecules of elements and compounds that are simply mixed together without chemical bonds

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40
Q

What techniques can be used to separate mixtures

A

Filtration chomography evaporation and distillation

41
Q

What is a base

A

A substance with a ph scale higher than seven

42
Q

What is chemistry

A

The study of reactions and structure of particles and molecules

43
Q

True or false there is an inner and outer cone on a flame

A

True

44
Q

What is it called that the Bunsen burner sits on

A

Heat resistant tile

45
Q

How many types of flames are there

A

3

46
Q

What are the types of flames

A

Safety flame blue flame and roaring flame

47
Q

What temp does water boil at

A

100 degrees

48
Q

Salt water boiled at what temp

A

105 degrees

49
Q

Does ink have a higher or lower boiling point than water

A

Ink had a higher boiling point

50
Q

What is an alkali

A

A base that dissolves in water

51
Q

What colour did acid drop turn with the universal indicator

A

Red

52
Q

What colour did indigestion power turn with the universal indicator

A

Dark green

53
Q

What colour did the sodium hydroxide solution turn with the universal indicator

A

Dark purple

54
Q

Acids make a light or dark colour when universal indicator is added

A

Light

55
Q

Alkalis make a light or dark colour when universal indicator is added

A

Dark

56
Q

What is the test for hydrogen

A

The flame test: a flame is inserted into a gas jar

57
Q

What is a positive result for the hydrogen test

A

A pop noise is heard and a flame maybe seen

58
Q

What does neutral mean in terms of of ph

A

7.0

59
Q

What is the equipment called that the Bunsen burner goes on top of

A

Tripod

60
Q

I put my solution in my …… Flask

A

Conical

61
Q

What an acidic compound dissolves in water it produces..……

A

Hydrogen H+

62
Q

What an alkaline compound dissolves in water it produces..……

A

Hydroxide ions OH-

63
Q

Acids react with alkalis to form……. This is called what

A

Salts and neutralisation reaction

64
Q

Hydrochloric acid + sodium hydroxide equals what

A

Sodium chloride + water

65
Q

Why must charcoal be added to the reaction mixture in the neutralisation experiment

A

To remove colour pigment

66
Q

When lithium hydroxide reacts with sulphuric acid you get what

A

Lithium sulphate + water

67
Q

What equipment is used to separate particles of a solid from a liquid

A

A funnel and filter paper

68
Q

Sand can be obtained from a mixture of sand and sea water by

A

Filtration

69
Q

Diesel can be obtained from crude oil by

A

Fractional distillation

70
Q

Pure water can be obtained from a salt solution by

A

Distillation

71
Q

Salt can be obtained from a salt solution by

A

Evaporation

72
Q

What is an solution

A

a mixture of a solvent and a solute

73
Q

What is a solvent

A

A liquid in which a solute dissolves

74
Q

What is a solute

A

A substance that dissolves in a solvent

75
Q

What is boiling

A

When a substance reaches boiling point

76
Q

What is evaporating

A

Going from a liquid to a gas happens at Room temperature

77
Q

In chromatography what should the line where to ink spots are placed be drawn with and why

A

A pencil because no ink to prevent contamination

78
Q

A substance which turns one colour in acid and another in alkali is called a

A

Indicator

79
Q

Litmus turns what colour in an acid and what colour in an alkali

A

Red in acid and blue in alkali

80
Q

Something that is neither an acid or an alkali is said to be….

A

Neutral

81
Q

What ph would you expect from sulphuric acid

A

Ph = 2-4

82
Q

What ph would be expected from sodium hydroxide

A

11-14

83
Q

What is the ph for grapefruit juice

A

3.1

84
Q

What is the ph for ethanoic acid

A

3.0

85
Q

What is the ph for dilute hydrochloric acid

A

1.0

86
Q

In nature carbon dioxide is created by organism which undertake what

A

Respiration

87
Q

Calcium carbonate + hydrochloric acid equals what

A

Calcium chloride + carbon dioxide + water

88
Q

What is the test for carbon dioxide

A

Bubble carbon dioxide through limewater

89
Q

What is a positive result for the carbon dioxide test

A

Turning milky white

90
Q

In nature oxygen is created by plants doing what

A

photosynthesising

91
Q

In nature the formula for oxygen is Carbon dioxide + water equals what

A

Glucose + oxygen

92
Q

In the lab the formula for hydrogen peroxide equals what

A

Water + oxygen

93
Q

The test for oxygen is what

A

The glowing splint test we insert a glowing splint into the gas produced

94
Q

What is a positive result for the oxygen test

A

The splint reignites

95
Q

How much percentage is nitrogen

A

79%

96
Q

How much percentage is oxygen

A

20%

97
Q

How much percentage is carbon dioxide

A

0.03%

98
Q

What is the percentage for other gases

A

1%

99
Q

What is a saturated solution

A

A solution that can have no more solid dissolves in it

year 7 end of years (7 decks)

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