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WorksheetsAcid and Alkali
Total questions: 15
Worksheet time: 8mins
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
What is the colour change observed with phenolphthalein when adding acid to alkali?
pink --> colourless
blue --> red
orange --> pink
green --> yellow
Phenolphthalein has a pink color in a solution that has a pH of
5
11
1
7
A substance that changes colour when mixed with an acid or base is a(n) ___.
indicator
neutraliser
corrosive
electricity
