WorksheetsReview Unit 7 Material Changes
Total questions: 20
Worksheet time: 8mins
Which of the following descriptions about nitric acid is incorrect?
It turns blue litmus paper to red
The blue litmus paper remains blue
The red litmus paper remains red
The pH value is below 7
This corrosive substance is a strong alkali.
beetroot
cabbage
nitric acid
sodium hydroxide
If a Universal Indicator goes green, the solution must be ....
strong acid
acid
alkali
neutral
If a Universal Indicator goes red, the solution must be ....
strong acid
strong alkali
alkali
neutral
Pure water is neutral. Which one of these pH values is neutral?
pH 1
pH 5
pH 7
pH 10
Ammonia solution is a weak alkali and it turns a Universal Indicator into....
red
yellow
blue
purple
Joanne is having a stomachache due to acidity problem. Which of the following can neutralize the acidity and help her feel better?
Citric acid
Lemon juice
Mango juice
Magnesium hydroxide
There are several methods that farmers usually used to maintain the pH of soil at an acceptable level for the crops to be grown. One of those is adding ___________ to acidic soil.
salt
sugar
lime
vinegar
This symbol indicates....
harmful substance
toxic substance
flammable substance
corrosive substance
This symbol indicates....
harmful substance
toxic substance
flammable substance
corrosive substance
This symbol indicates....
harmful substance
toxic substance
flammable substance
corrosive substance
What is the general equation of neutralisation reaction?
Acid + alkali --> salt + hydrogen
Acid + alkali --> salt + water
Acid + alkali --> salt + carbon dioxide
Acid + alkali --> salt + carbon dioxide + water
Wasp sting is alkaline and can be neutralised by....
baking soda
limestone
sugar
vinegar
If a substance has a pH of 2, then it is classified as....
strong acid
weak acid
strong alkali
weak alkali
Toothpaste for cleaning the teeth can neutralize the excess acid and prevent....
hair decay
muscle decay
gum decay
tooth decay
What colour does Universal Indicator go in a liquid with a pH of 10?
blue
green
yellow
red
Which of the following word or phrase associated with alkalis?
make universal indicator turn red
pH 4
lemon juice
soapy
Which of the following word or phrase associated with acids?
make universal indicator turn red
make universal indicator turn blue
limestone
soapy
Which of the substance is a strong acid?
Hydrogen chloride pH 2
Citric acid pH 5
Sodium chloride pH 7
Potassium hydroxide pH 13
Alkalis will turn red litmus paper blue
True
False
