WorksheetsYear 7 Science Chapter 5.5
Total questions: 21
Worksheet time: 11mins
what is an acid?
A pH lower then 7
A pH higher then 7
A pH of 7 (neutral)
What is an alkali?
A pH lower then 7
A pH higher then 7
A pH of 7 (neutral)
What happens when an alkali and acid is mixed together?
They become neutral if an acid and alkali is added equally
They explode as soon as they've touch each other
They have shown no reaction
The color changes to blue when mixed for a short time
Lemons are sour because it has...
Citric acid
Malic acid
Fumaric acid
Tartaric acid
Sodium hydroxide is a strong alkali
True
False
When an alkali or acid is spilled, you should...
Wipe the area with cloth quickly
Ignore it
Cover the area with an item
Quickly wash the area with lots of water
Which food(s) contains acid?
Lemon
Lime
Cola
None of the above
Which pH level indicates a weak alkali?
1-3
4-6
8-11
12-14
Reaction between acid and alkali producing salt and water:
Combustion
Neutralization
Precipitation
Decomposition
The pH of pure water
5.6
7.0
8.1
0.0
What is the meaning of the above hazard warning symbol?
Corrosive
Explosive
Toxic
Radioactive
Acid in our stomach:
Hydrochloric acid
Sulfuric acid
Acetic acid
Carbonic acid
Which substance is alkali?
Toothpaste
Vinegar
Lemon juice
Soft drink
Acids taste .....
sour
bitter
sweet
umami
What happens to the pH of an acid during neutralisation?
It stays the same
It moves toward pH 1
It moves towards pH 7
It moves towards pH 14
If you wanted to test a colourless and odourless substance at home, what household item could you use?
Red cabbage water
Bleach
Water
Vinegar
Which substance is an acid?
Water
Bleach
Orange juice
Washing powder
Which pH levels indicated a strong acid?
1-3
4-6
8-11
12-14
When you get a bee sting, what will you use to make you feel better ?
Water
Baking soda
Milk
Toothpaste
Which of the following about properties of acid is not true?
pH less than 7
Tastes bitter
Corrosive
Turns blue litmus paper to red
Sodium hydroxide is used
to make fertilisers.
to make battery.
to cure gastritis.
to make detergent.
