Year 8 Term 1 - Acids, Alkalis and Neutralisationa

Question 1

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

Answer 1

Citric acid

Question 2

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

Answer 2

100g in 1L
100 times more

Question 3

Where can you find hydrochloric acid?

Answer 3

In the stomach

Question 4

Where is sulphuric acid used?

Answer 4

Car batteries

Question 5

Where is nitric acid used?

Answer 5

Fertilisers

Question 6

Where can you find ethanoic acid?

Answer 6

In vinegar

Question 7

Where can you find citric acid?

Answer 7

In citrus fruits such as oranges and lemons

Question 8

Where can you find carbonic acid?

Answer 8

Fizzy drinks

Question 9

What’s the highest pH value on the scale?

Answer 9

14

Question 10

What substance might have the pH value 14?

Answer 10

Sodium hydroxide (oven cleaners)

Question 11

What do you use calcium hydroxide for? (Lime)

Answer 11

Neutralising soil with too much acid

Question 12

What do you use magnesium hydroxide for?

Answer 12

Indigestion remedies

Question 13

What do you use sodium hydroxide for?

Answer 13

Oven cleaners

Question 14

What do you use ammonia for?

Answer 14

Cleaning silver and brass

Question 15

What natural substances can be used to make indicators?

Answer 15

Red cabbage and rhubarb

Question 16

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

Answer 16

Acid: pink/red
Alkali: green

Question 17

4 names of indicators

Answer 17

Methyl orange, brothymol blue, phenolphthalein and litmus

Question 18

Methyl orange colours in acid and alkali

Answer 18

Red in acid and yellow in alkali

Question 19

Colour of Brothymol blue in acid and alkali

Answer 19

Yellow/orange in acid and green in alkali

Question 20

Phenolphthalein in acid and alkali

Answer 20

Colourless in acid and pink in alkali

Question 21

Litmus in acid and alkali

Answer 21

Red in acid and blue in alkali

Question 22

What pH number is neutral?

Answer 22

7

Question 23

A pH with less than 7 is..

Answer 23

Acidic

Question 24

A pH with more than 7 is…

Answer 24

Alkaline

Question 25

0-2 is what colour in universal indicator

Answer 25

Red

Question 26

3-4 is what colour in universal indicator

Answer 26

Orange

Question 27

5-6 is what colour in universal indicator

Answer 27

Yellow

Question 28

7 is what colour in universal indicator

Answer 28

Green

Question 29

8-9 is what colour in universal indicator

Answer 29

Blue/green

Question 30

10-11 is what colour in universal indicator

Answer 30

Blue

Question 31

12-14 is what colour in universal indicator

Answer 31

Purple

Question 32

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

Answer 32

Strongly acidic

Question 33

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

Answer 33

Weakly acidic

Question 34

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

Answer 34

Weakly alkaline

Question 35

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

Answer 35

Strongly alkaline

Question 36

Why are pH meters more accurate?

Answer 36

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

Question 37

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

Answer 37

Base

Question 38

An example of a metal oxide is..

Answer 38

Copper oxide

Question 39

A metal oxide that can dissolve in water is called an

Answer 39

Alkali but also a base at the same time

Question 40

An example of a metal hydroxide is

Answer 40

Sodium hydroxide and calcium hydroxide

Question 41

An example of an acid and base neutralising

Answer 41

Hydrochloric acid + potassium/sodium hydroxide = neutral solution

Question 42

Acid + base = salt. This is:

Answer 42

Neutralisation

Question 43

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

Answer 43

Red to orange to yellow to green

Question 44

Acid + base =

Answer 44

Salt + water

Question 45

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

Answer 45

Magnesium hydroxide, hydrochloric acid

Question 46

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

Answer 46

Soap - a weak alkali or base

Question 47

Treating wasp stings could use … to neutralise the sting

Answer 47

Vinegar - a weak acid

Question 48

Treating nettle stings can use … to neutralise the sting

Answer 48

Doc leaves/ soap - a weak acid

Question 49

Treating acid soil could use … to neutralise the soil

Answer 49

Calcium hydroxide (lime)

Question 50

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

Answer 50

It splits apart

Question 51

What happens if you mix citric acid and sodium hydrogencarbonate?

Answer 51

Nothing

Question 52

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

Answer 52

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