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WorksheetsY7 Acids & Alkalis
Total questions: 34
Worksheet time: 23mins
Name
Class
Date
1.
Which of the following substances contain acid?
a)
An orange
b)
Bleach
c)
Distilled water
d)
Washing powder
2.
Which of the following substances contain a base?
a)
Baking powder
b)
Coca cola
c)
Distilled water
d)
Vinegar
3.
Which of the following pH numbers indicates a neutral substance?
a)
1
b)
5
c)
7
d)
14
4.
Which of the following pH numbers indicates a strong acid?
a)
1
b)
5
c)
7
d)
14
5.
Which of the following pH numbers indicate a strong alkali?
a)
1
b)
5
c)
7
d)
14
6.
Which of the following acids do we have in our stomach?
a)
Ethanoic acid
b)
Hydrochloric acid
c)
Nitric acid
d)
Sulphuric acid
7.
What colour is universal indicator in strong acid?
a)
Green
b)
Orange
c)
Purple
d)
Red
8.
What colour is universal indicator in a neutral solution?
a)
Green
b)
Orange
c)
Purple
d)
Red
9.
What colour is universal indicator in a strong alkali?
a)
Green
b)
Orange
c)
Purple
d)
Red
10.
Strong acids and strong alkalis are.......
a)
Able to turn blue litmus paper red
b)
Corrosive and/or caustic
c)
Sour
d)
Sweet
11.
What is the pH of pure water?
a)
pH 7
b)
pH 3
c)
pH 12
d)
pH 8
12.
What happens to the pH of a acid during neutralisation?
a)
It stays the same
b)
It moves up towards pH 7
c)
It moves down to pH 1
d)
It lowers
13.
A wasp sting is alkaline. Which one of these substances would neutralise the sting?
a)
Vinegar
b)
Bleach
c)
Baking soda
d)
Pure water
14.
Indigestion medicine is taken to neutralise excess stomach acid. What type of substance is this medicine?
a)
Basic
b)
Acidic
c)
Neutral
15.
What two substance are formed when an acid and alkali react together in equal amounts?
a)
Salt and water
b)
Alkali and water
c)
Acid and water
d)
Acid and alkali
16.
What substance could you use to test if a substance is an acid or alkali?
a)
Universal Indicator
b)
Salt
c)
Catalyst
d)
Water
17.
When found in food, acids are ________
a)
Sour
b)
Bitter
c)
Salty
d)
Slippery
18.
The pH of a solution is tested, and it is found to be a basic solution. Of the following choices, what could the pH have been?
a)
3
b)
9
c)
7
d)
5
19.
What is an alkali?
a)
Has a pH of 3
b)
Has a pH of 7
c)
A soluble base
d)
An insoluble base
20.
What is an acid?
a)
a chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus paper red
b)
Has a pH of 11
c)
Has a pH of 7
d)
a soluble base
21.
Based on its pH level, which of the following is an acid?
a)
sea water, pH=8.25
b)
detergent, pH=10
c)
milk, pH=6.5
d)
human saliva, pH=7
22.
Explain what happens when a strong acid and a strong base are poured into the same container.
a)
They form separate layers.
b)
They mix physically but not chemically.
c)
They break apart into separate elements.
d)
They react chemically to form a salt.
23.
Antacids are used to fight stomach acid and relieve heartburn. Which of the following would make the best antacid?
a)
a weak acid
b)
a base
c)
a strong acid
d)
a neutral substance
24.
If the pH of a substance is 12.4, that substance would be a ____________.
a)
strong acid
b)
strong alkali
c)
weak alkali
d)
weak acid
25.
A 4th grade class noticed the plants and animals in a nearby lake have recently begun to decrease. When the class tested the water, they found it had a pH of 4.5. What does this level indicate?
a)
The lake has become too acidic to support life.
b)
The lake has become too basic to support life.
c)
The lake does not have enough dissolved oxygen to support life.
d)
The lake contains too much suspended sediment to support life.
26.
Which of the following substances is the strongest acid?
a)
soda, pH 3
b)
tomatoes, pH 4.5
c)
stomach acid, pH 2
d)
coffee, pH 5
27.
What type of liquid would taste bitter and feel slippery?
a)
an alkali
b)
an acid
c)
water
d)
citrus juice
28.
Which of the following is true of acids and bases?
a)
The lower the pH, the stronger the acid.
b)
The higher the pH, the stronger the acid.
c)
The lower the pH, the more neutral the acid.
d)
The higher the pH, the weaker the base.
29.
Lemon juice has a pH of 2. What does this indicate about lemon juice?
a)
It is an acid.
b)
It is a base.
c)
It is a salt.
d)
It is neutral.
30.
A student adds a few drops of acid to a beaker of water having pH 7. What is the most likely pH of the resulting solution?
a)
6
b)
9
c)
11
d)
13
31.
What does a pH scale do?
a)
Tells if a substance is an acid or base
b)
Measures the strength and weakness of acids and bases
c)
Both statements are correct
32.
A common alkali used in the lab is
a)
hydrochloric acid
b)
sodium chloride
c)
hydrogen sulphate
d)
sodium hydroxide
33.
When sodium hydroxide and hydrochloric acid react together, the name of the salt produced is
a)
sodium acid
b)
sodium hydrochloric
c)
sodium chloride
d)
hydrogen chloride
34.
Complete the equation:
calcium hydroxide + sulphuric acid -->
calcium hydroxide + sulphuric acid -->
a)
calcium sulphuric + hydroxide acid
b)
calcium sulphate + water
c)
hydrogen sulphate + calcium hydroxide
d)
magnesium oxide + calcium
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