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WorksheetsY7 Ph Review
Total questions: 35
Worksheet time: 19mins
A chemical has a pH = 6. It would be best described as
Strong acid
Strong base
Weak acid
Weak base
A chemical has a pH = 2. It would be best described as
Strong acid
Strong base
Weak acid
Weak base
In a test of pH levels, a baking soda has a pH of 9 and bleach has a pH of 12. What is true about there relationship?
Both of the solution are bases
Both of the solution are acids
The Baking soda is an acid and the Bleach is a base
The baking soda is a base and the Bleach is an acid.
As you move down the pH scale from 14 to 1, what happens to the concentration of H+ in the solution?
concentration of H+ decreases
concentration of H+ increases
concentration of H+ stays the same
What might happen if you mixed a strong acid with an equally strong base?
You would see an explosive chemical reaction.
The acid would destroy the base.
The base would destroy the acid.
You'd wind up with a pH-neutral substance.
What colour is Universal indicator when the solution is neutral?
Red
Green
Blue
Purple
Toothpaste contains .................. that neutralise acid formed by bacteria.
alkali
acid
antacid
slaked lime
Bee stings contain ............................ and can be neutralised using bicarbonate soda.
alkali
acid
vinegar
soda
What colour is universal indicator when something is a strong acid?
green
yellow
red
purple
What colour universal indicator would show that a solution is alkali?
green
yellow
blue
red
Why is toothpaste alkaline?
It can neutralise strong alkaline in
your mouth
It can neutralise acid in
your mouth
It can refresh your teeth
Toothpaste is not alkaline.
What type of reaction occurs when you react an acid with an alkali?
combustion
decomposition
no reaction
neutralisation
What colour change would you see if you added nitric acid to sodium hydroxide and universal indicator?
red -> blue
purple -> green
red -> yellow
pink -> colourless
Excess acids in stomach can be neutralized using ............
antacid
vinegar
slaked lime
hydrochloric acid
..................................... is used to treat water to reduce the acidity of water.
alkali
slaked lime
antacid
vinegar
Complete the word equation below:
Acid + alkali --> ............... + water
water
salt
gold
metal
Where does the acid in you mouth come from?
From stomach
From stomach acid
From the millions of
bacteria of mouth
From the teeth
What colour is litmus in solution of pH 4?
green
red
blue
dark blue
Sodium hydroxide is an ..
Acid
Alkali
Fabric softener is ...... and help to reduce pH of cloth after being washed with detergent
Acidic
Alkaline
Example of acids
Vinegar
Limewater
Toothpaste
Detergent
It is much easier and safer to neutralise acid spills by
adding a base
diluting with water
covering with sand
waiting for the acid to evaporate
A few drops of universal indicator caused a solution to turn red. Which of the substance below can we use to neutralise it?
sugar solution
salt solution
alkali solution
acidic solution
What colour is litmus paper if the pH of a solution is 9?
red
green
purple
blue
