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Chemistry > Year 8 Term 1 - Acids, Alkalis and Neutralisationa > Flashcards

Year 8 Term 1 - Acids, Alkalis and Neutralisationa Flashcards

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1
Q

Acids must be dissolved in water. What was the solid acid you dissolved in this topic?

A

Citric acid

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2
Q

More Acidic: 100g Hyrdochloric acid in 1L water / 1g acid in 1L water

A

100g in 1L
100 times more

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3
Q

Where can you find hydrochloric acid?

A

In the stomach

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4
Q

Where is sulphuric acid used?

A

Car batteries

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5
Q

Where is nitric acid used?

A

Fertilisers

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6
Q

Where can you find ethanoic acid?

A

In vinegar

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7
Q

Where can you find citric acid?

A

In citrus fruits such as oranges and lemons

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8
Q

Where can you find carbonic acid?

A

Fizzy drinks

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9
Q

What’s the highest pH value on the scale?

A

14

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10
Q

What substance might have the pH value 14?

A

Sodium hydroxide (oven cleaners)

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11
Q

What do you use calcium hydroxide for? (Lime)

A

Neutralising soil with too much acid

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12
Q

What do you use magnesium hydroxide for?

A

Indigestion remedies

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13
Q

What do you use sodium hydroxide for?

A

Oven cleaners

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14
Q

What do you use ammonia for?

A

Cleaning silver and brass

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15
Q

What natural substances can be used to make indicators?

A

Red cabbage and rhubarb

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16
Q

What colour was the red cabbage indicator in acid and alkali?

A

Acid: pink/red
Alkali: green

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17
Q

4 names of indicators

A

Methyl orange, brothymol blue, phenolphthalein and litmus

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18
Q

Methyl orange colours in acid and alkali

A

Red in acid and yellow in alkali

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19
Q

Colour of Brothymol blue in acid and alkali

A

Yellow/orange in acid and green in alkali

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20
Q

Phenolphthalein in acid and alkali

A

Colourless in acid and pink in alkali

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21
Q

Litmus in acid and alkali

A

Red in acid and blue in alkali

22
Q

What pH number is neutral?

A

7

23
Q

A pH with less than 7 is..

A

Acidic

24
Q

A pH with more than 7 is…

A

Alkaline

25
Q

0-2 is what colour in universal indicator

A

Red

26
Q

3-4 is what colour in universal indicator

A

Orange

27
Q

5-6 is what colour in universal indicator

A

Yellow

28
Q

7 is what colour in universal indicator

A

Green

29
Q

8-9 is what colour in universal indicator

A

Blue/green

30
Q

10-11 is what colour in universal indicator

A

Blue

31
Q

12-14 is what colour in universal indicator

A

Purple

32
Q

A pH of 0-3 means the solution is..

A

Strongly acidic

33
Q

A pH of 4-6 means the solution is..

A

Weakly acidic

34
Q

A pH of 8-10 means the solution is..

A

Weakly alkaline

35
Q

A pH of 11-14 means the solution is..

A

Strongly alkaline

36
Q

Why are pH meters more accurate?

A

They can record the pH to 1 d.p. and don’t rely on people interpreting the measurement

37
Q

Any metal oxide that cannot dissolve in water is called a..

A

Base

38
Q

An example of a metal oxide is..

A

Copper oxide

39
Q

A metal oxide that can dissolve in water is called an

A

Alkali but also a base at the same time

40
Q

An example of a metal hydroxide is

A

Sodium hydroxide and calcium hydroxide

41
Q

An example of an acid and base neutralising

A

Hydrochloric acid + potassium/sodium hydroxide = neutral solution

42
Q

Acid + base = salt. This is:

A

Neutralisation

43
Q

If an acidic solution has universal indicator in it and is neutralised what colours will the solution go through before it becomes neutral ?

A

Red to orange to yellow to green

44
Q

Acid + base =

A

Salt + water

45
Q

In indigestion treatment ……. Neutralises ………. In the stomach

A

Magnesium hydroxide, hydrochloric acid

46
Q

Treating bee stings could use ……. To neutralise the sting

A

Soap - a weak alkali or base

47
Q

Treating wasp stings could use … to neutralise the sting

A

Vinegar - a weak acid

48
Q

Treating nettle stings can use … to neutralise the sting

A

Doc leaves/ soap - a weak acid

49
Q

Treating acid soil could use … to neutralise the soil

A

Calcium hydroxide (lime)

50
Q

What happens to the acid as it dissolved in water in under acid-style reactions?

A

It splits apart

51
Q

What happens if you mix citric acid and sodium hydrogencarbonate?

A

Nothing

52
Q

What 3 things happen when you mix citric acid and sodium hydrogencarbomate and add water?

A

It fizzes, it cools down and it gives a colourless solution

Chemistry (3 decks)

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