Home / Chemistry Learning / Worksheet Acids and Alkalis

Worksheet Acids and Alkalis

Worksheet Acids and Alkalis - This worksheet consists of two sections are section A and section B. Section A contains multyple choice questions and section B is essay. Without reffering to the textbook, try to answer this question.

Section A
Choose the best answer by circling the letter A, B, C, or D
1.    The element always present in acids is …
A.    carbon
B.    hydrogen
C.    oxygen
D.    sulphur

2.    Use the table below to decide which of the statements is true.

pH

Vegetable

(grow at this pH in soil)

Fish

(live in water at this pH)

4.5 – 5.0

Potatoes Trout

5.0 – 6.0

Parsley Perch

6.0 – 7.0

Cabbage Salmon

A.    Cabbage grows better than parsley in acidic soil.
B.    Potatoes grow well in alkaline soil.
C.    Trout prefer chalky alkaline river streams.
D.    Salmon prefer neutral water.
3.   Which of these statements applies to alkalis?
I.    Have a soapy feel
II.    Give off carbon dioxide gas with carbonates
III.    Give off hydrogen gas with certain metals
A.    I only
B.    I and II
C.    I and III
D.    All of these
4. A student was investigating the properties of a liquid L. He found that it turned phenolphthalein indicator red but when a piece of litmus paper was dipped into liquid L it turned blue. Which of these liquids could it be?
A.    Aqueous ammonia
B.    Lemon juice
C.    Copper sulphate solution
D.    Sugar solution
5.  The table shows the pH of various liquids. Which of these liquids, A, B, C or D, when added to magnesium ribbon would give off hydrogen gas?

Liquid

pH value

A

2

B

7

C

8

D

14

6.  The table shows the pH of various solutions.
Solution    P    Q    R    S
pH               4    7    9    10
When equal volumes are mixed together, which two of these solutions will produce a neutral solution?
A.    P and R
B.    P and S
C.    Q and R
D.    R and S
7. When electricity is passed through acidified water, bubbles are formed. This is because water …
A.    decomposes to form oxygen and hydrogen gases
B.    heats up and forms steam
C.    is a good conductor of electricity
D.    reacts with the electricity to form acid gas
8. The table shows the pH of various substances in solution. Which of these substances, when added to a marble chip (calcium carbonate), would give off carbon dioxide gas?

Substance

pH value

A

2

B

7

C

11

D

14

9.  Which of these substances has the highest pH?
A.    Caustic soda
B.    Fruit juice
C.    Limewater
D.    Seawater
10. Which of these sources of organic acids is incorrect?
Source        Name of organic acid
A.    Fruit            Citric acid
B.    Milk              Tartaric acid
C.    Tea                Tannic acid
D.    Vinegar      Ethanoic acid
11.    Which of these statements applies to acids?
I.    Gives off a gas when added to carbonates
II.    Feels soapy to touch
III.    Has no effect on red litmus
IV.    Dissolves many metals to form salts
A.    I, II and III
B.    I, II and IV
C.    I, III and IV
D.    All of these
12. When sulphuric acid is added to sodium carbonate it fizzes and gives off carbon dioxide gas. Which key gives the correct reactants (chemicals you start with) and products (chemicals that you finish with)?

Reactants

Products

A

Sodium carbonate, carbon dioxide Sodium sulphate, sulphuric acid, water

B

Sodium carbonate, sodium sulphate Carbon dioxide, sulphuric acid, water

C

Sodium carbonate, sulphuric acid Sodium sulphate, carbon dioxide, water

D

Sodium sulphate, carbon dioxide Sodium carbonate, sulphuric acid, water

13.  Which of the following are properties of alkalis?
I.    A bitter taste
II.    A soapy feel
III.    Turn moist blue litmus red
IV.    React with ammonium salts to produce hydrogen gas
A.    I and II
B.    I, II and III
C.    II and IV
D.    All of thes
14.  Which of the following is true of acid?
A.    It has a pH of more than 7.
B.    It produces a gas with an alkali.
C.    It produces effervescence with baking powder.
D.    It turns Universal Indicator blue.
15.  When sulphuric acid is added to calcium carbonate, the gas produced …
A.    extinguishes a lighted splint with a ‘pop’ sound
B.    relights a glowing splint
C.    turns limewater chalky
D.    turns litmus paper green
16.  Which of the following is an example of neutralisation in everyday life?
A.    Adding bleach to whiten clothes
B.    Adding common salt to meat
C.    Rubbing ointment to skin
D.    Taking antacids for gastric pains
17.  Acid rain causes lakes to be polluted. Which substance is used to neutralise the acids in the water?
A.    Calcium
B.    Calcium nitrate
C.    Calcium oxide
D.    Calcium sulphate
18. Given two substances, an acid and an alkali, you cannot identify them by adding … to these substances.
A.    a piece of magnesium
B.    an indicator
C.    calcium carbonate
D.    hydrochloric acid
19. Which of the following word equations does not show neutralisation between an acid and an alkali?
A.    Aqueous ammonia + Nitric acid ? Ammonium nitrate + Water
B.    Carbonic acid + Calcium hydroxide ? Calcium carbonate + Water
C.    Sodium hydroxide + Sulphuric acid ? Sodium sulphate + Water
D.    Zinc + Sulphuric acid ? Zinc sulphate + Hydrogen
20. Which of the following is not an indicator?
A.    Datalogger
B.    Methyl orange
C.    Phenolphthalein
D.    Red and blue litmus

Section B
Answer the following question on the space provided
1. In the following, you will need to convert the names of the material into formulae and then complete and balance the resulting equation.
a. Zinc metal reacts with hydrochloric acid solution
b. Copper (II) oxide was poured into sulphuric acid solution and  then heated to produce a blue solution
c. Barium nitrate solution was added into sodium sulphate solution

2. Why HCl conduct electricity when dissolved in water but can’t when dissolved in methylbenzene?

3. Draw a rough graph when 10 cm3 of 0.1 mol/dm3 nitric acid is neutralisation with 0.1 mol/dm3 sodium hydroxide

4. The information in the box is about the preparation of zinc nitrate crystals
step 1 : Add a small amount of zinc oxide to some hot dilute acid, and stir
step 2 : Keep adding zinc oxide until it is in excess
step 3 : Remove the excess zinc oxide to leave colourless zinc nitrate solution
step 4 : Evaporate the zinc nitrate solution until it is saturated
step 5 : Leave the saturated solution to cool. White crystals form on cooling
step 6 : Remove the crystals from the remaining solution
step 7 : Dry the crystals on a piece of filter paper
a. Suggest a reason for using zinc oxide in step
b. Suggest how the excess zinc oxide can be removed from the solution in step 3.

Share and Enjoy

  • Facebook
  • Twitter
  • Delicious
  • LinkedIn
  • StumbleUpon
  • Add to favorites
  • Email
  • RSS

Leave a Reply

Your email address will not be published. Required fields are marked *

*

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>

WP Socializer Aakash Web