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Acids and Alkalis 01
The acid found in lemons is citric acid.

Acids and Alkalis 01

Fast Revision of KS3 Science

Aged between 11 and 14? This quiz is especially for you.

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FIND OUT ABOUT SUBSCRIPTIONS

1.
Which of the following pH numbers indicates a strong acid?
1
5
7
14
Be careful not to confuse a strong acid with a concentrated acid - a strong acid will always give a pH value of 1 or 2 until it is extremely dilute
2.
Which of the following pH numbers indicate a strong alkali?
1
5
9
14
Hydrangea flowers can be blue or pink depending on the pH of the soil
3.
Which of the following substances contain an alkali?
Baking powder
Coca cola
Distilled water
Vinegar
It is weak enough to be used in food
4.
Which of the following pH numbers indicates a neutral substance?
1
5
7
14
Pure water has this pH value
5.
What colour is universal indicator in a strong alkali?
Green
Orange
Purple
Red
For weak alkalis, the colour is more of a blueish-green. It is often easier to see the colour using universal indicator paper
6.
What colour is universal indicator in a neutral solution?
Green
Orange
Purple
Red
When using universal indicator liquid, you only ever need to add a few drops to see the colour
7.
Which of the following acids do we have in our stomach?
Ethanoic acid
Hydrochloric acid
Nitric acid
Sulfuric acid
The acid kills bacteria and helps to begin the process of digesting proteins
8.
Strong acids and strong alkalis are.......
Able to turn blue litmus paper red
Corrosive and/or caustic
Sour
Sweet
We use the word corrosive for acids and caustic for alkalis, either way, if you get any on your skin, they are both harmful and will cause a chemical burn
9.
Which of the following substances contain acid?
An orange
Bleach
Distilled water
Washing powder
Citrus fruit (oranges, lemons etc) contain citric acid
10.
What colour is universal indicator in strong acid?
Green
Orange
Purple
Red
Red indicates a pH of 1 or 2
You can find more about this topic by visiting BBC Bitesize - Acids and alkalis

Author:  Sue Davison

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