Year 8 Term 1

Question 1

What is an acid ?

Answer 1

A substance that dissolves in water with a pH less than 7

Question 2

Names common acids.

Answer 2

Hydrochloric acid, sulfuric acid, nitric acid, ethanoic acid, citric acid and carbonic acid.

Question 3

What is an alkali ?

Answer 3

A substance that dissolves in water to give a solution with pH more than 7.

Question 4

Name common alkalis.

Answer 4

Calcium hydroxide(lime), magnesium hydroxide, sodium hydroxide and ammonia.

Question 5

What is an indicator ?

Answer 5

A substance which is one colour in an acidic solution and another in an alkaline solution.

Question 6

Can indicators be made from natural coloured substances ?

Answer 6

Yes they can be made from natural coloured substance (red cabbage).

Question 7

Name common lab indicators.

Answer 7

Methyl orange, bromothymol blue, phenolphthalein and litmus.

Question 8

What is universal indicator ?

Answer 8

It is a mixture of different indicators that shows how strong an acid or alkali solution is.

Question 9

What is a base ?

Answer 9

It’s an insoluble metal oxide or hydroxide.

Question 10

What is an alkali ? (In terms of base)

Answer 10

A soluble base.

Question 11

What does a base do ?

Answer 11

Reacts with an acid and neutralises it.

Question 12

What is the reaction between an acid and base called ?

Answer 12

It’s called a nuetralisation.

Question 13

What can a neutralisation reaction be followed by ?

Answer 13

An indicator

Question 14

What is salt made in ?

Answer 14

Salt is made in a neutralisation reaction.

Question 15

State common uses of neutralisation reactions.

Answer 15

Indigestion, bee stings (acidic), wasp stings (alkaline), nettle stings (acidic) and soil treatment.

Question 16

What do acids need to work in an acidic fashion ?

Answer 16

Water.

Question 17

What is the difference between concentrated and diluted acids ?

Answer 17

There is more acid in a concentrated acid than a diluted acid.

Question 18

Are bee stings acidic or alkaline ?

Answer 18

Acidic

Question 19

Are wasp stings acidic or alkaline ?

Answer 19

Alkaline

Question 20

Are nettle stings acidic or alkaline ?

Answer 20

Acidic

Question 21

What was the solid acid we dissolved ?

Answer 21

Citric acid

Question 22

What’s the lowest pH value on the scale ?

Answer 22

pH 0

Question 23

Where is hydrochloric acid found ?

Answer 23

A human stomach

Question 24

Where is sulphuric acid found ?

Answer 24

Car battery

Question 25

Where is nitric acid found ?

Answer 25

Soil treatment

Question 26

Where is ethanoic acid ?

Answer 26

Vinegar

Question 27

Where is citric acid found ?

Answer 27

Citric fruit (orange, lemon)

Question 28

Where is carbonic acid found ?

Answer 28

Fizzy drinks

Question 29

What’s the highest pH value on the scale ?

Answer 29

pH 14

Question 30

What is calcium hydroxide(lime) used in ?

Answer 30

Treating soil that’s too acidic.

Question 31

What is magnesium hydroxide used for ?

Answer 31

Indigestion

Question 32

What is sodium hydroxide used for ?

Answer 32

Oven and drain cleaner.

Question 33

What is ammonia used for ?

Answer 33

Fluids that clean silver and brass.

Question 34

What plants can make indicators?

Answer 34

Lichens, rhubarb

Question 35

What substance might a pH value of 14 ?

Answer 35

Sodium hydroxide

Question 36

What colour is a red cabbage indicator in an acid ?

Answer 36

Red

Question 37

What colour is a red cabbage indicator in an alkali ?

Answer 37

Green

Question 38

What colour is methyl orange in an acid ?

Answer 38

Red

Question 39

What colour is methyl orange in an alkali ?

Answer 39

Yellow

Question 40

What colour is bromothymol blue in an acid ?

Answer 40

Yellow

Question 41

What colour is bromothymol blue in an alkali ?

Answer 41

Green

Question 42

What colour is phenolphthalein in an acid ?

Answer 42

Colourless

Question 43

What colour is phenolphthalein in an alkali ?

Answer 43

Pink

Question 44

What colour is litmus in an acid ?

Answer 44

Red

Question 45

What colour is litmus in an alkali ?

Answer 45

Blue

Question 46

What would an orange colour with universal indicator have a pH of ?

Answer 46

3 or 4

Question 47

What would a green colour would universal Indicator have a pH of?

Answer 47

7

Question 48

What are the blue colour with universal indicator have a pH of?

Answer 48

10 and 11

Question 49

A red colour would universal indicator would have a pH of?

Answer 49

0 and 2

Question 50

How many decimal places does a pH meter give ?

Answer 50

One

Question 51

Give an example of a metal oxide ?

Answer 51

Copper oxide

Question 52

Give an example of a metal hydroxide ?

Answer 52

Calcium hydroxide

Question 53

Give an example of a base neutralisation

Answer 53

Hydrochloric acid and potassium hydroxide

Question 54

What colours would an acidic solution go through before it’s neutralised ?

Answer 54

Red to orange to yellow to green.

Question 55

In indigestion treatment what acid and alkali are neutralised ?

Answer 55

Magnesium hydroxide and hydrochloric acid.

Question 56

What happens to the acid when it dissolve in water?

Answer 56

It splits apart

Question 57

What happens when you mix citric acid and sodium hydrogencarbonate ?

Answer 57

Nothing

Question 58

What happens when you mix citric acid and sodium hydrogen carbonate and add water ?

Answer 58

It fizzes, cools down and gives a colourless solution.