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Worksheets

Chemistry C4-Revision

Total questions: 162

Worksheet time: 2hrs 47mins

Name
Class
Date
1.
What is electrolysis?
a)
breaking down of a compound using a current
b)
making a compound using a current
2.
What kind of Electrical Current does Electroysis require?
a)
Direct
b)
Indirect
c)
Anternative
d)
A alternating
3.
Which statement correctly describes the 2 electrodes?
a)
The anode is negative and the cathode is positive
b)
The anode and cathode are both positive
c)
The anode is positive and the cathode is negative
d)
The anode and cathode are both negative.
4.
What is the name given to the solution that is being electrolysed?
a)
Salt solution
b)
Electric solution
c)
Mineral solution
d)
Electrolyte
5.
Explain why the electrolyte has to be a liquid.
a)
So the ions can move
b)
So the electrons can move
c)
So that it doesn't get too hot
d)
So the fish are ok
6.
It is essetial that the electrolyte is a liquid so that...
a)
Charged ions can migrate towards the electrodes. 
b)
Charged ions can migrate towards the electrodes.
c)
The solution can move around.
d)
The current can flow through it.
7.
What happens at the positive electrode?
a)
Positive non-metal ions are attracted
b)
Positive metal ions are attracted
c)
Negative non-metal ions are attracted
d)
Negative metal ions are attracted
8.
Positive ions (cations) will move towards the cathode (-) where they will discharge by....
a)
Breaking apart
b)
Losing electrons
c)
Clumping together.
d)
Gaining electrons
9.
When NaCl solution is electrolysed what has forms at the anode?
a)
Hydrogen
b)
Oxygen
c)
Chlorine
d)
Sodium
10.
What does the Cathode (-) do to ions?
a)
Give electrons to the Positive ions to turn them back into atoms
b)
Take electrons from the positive ions?
c)
Turn ions back into atoms by removing electrons
d)
Turn atoms into ions by adding electrons
11.

___________ electrode is an inert electrode.

a)

Copper

b)

Iron

c)

Carbon

d)

Zinc

12.

Ionic compounds do not conduct electricity when they are solid because,

a)

their electrons are not free to move

b)

their ions are free to move

c)

their ions are not free to move

d)

their electrons are free to move

13.

When a metal is reduced by reaction with carbon, which element is removed from the compound?

a)

Carbon

b)

Oxygen

c)

Hydrogen

d)

Silver

14.

What type of compound can undergo electrolysis?

a)

Metallic

b)

Giant covalent

c)

Simple covalent

d)

Ionic

15.

Which electrode do the negatively charged ions move to?

a)

Left

b)

Cathode

c)

Anode

d)

Right

16.

When you electrolyse a molten ionic compound, the product at the cathode is…

a)

a metal

b)

a non-metal

c)

a mixture

d)

a compound

17.

What test and result shows that hydrogen has been produced?

a)

Limewater turns cloudy

b)

A glowing splint relights

c)

It burns with a squeaky pop

d)

Damp blue litmus paper turns red

18.

When an electric current is passed through an electrolyte, the ions move to…

a)

the magnets

b)

the poles

c)

the electrodes

d)

the pipettes

19.

What is made when an acid reacts with a base?

a)

A salt and water only

b)

A salt and carbon dioxide only

c)

A salt and hydrogen only

d)

A salt, hydrogen and carbon dioxide

20.

Oxidation is the… (Higher Tier Question)

a)

loss of electrons

b)

gain of electrons

c)

loss of protons

d)

gain of protons

21.

Most metals are found in the earth as…

a)

elements

b)

mixtures

c)

compounds

d)

atoms

22.

What is an alkali?

a)

An alkali is an acid by another name

b)

An alkali is a base that is soluble in water

c)

An alkali is a type of rock

d)

An alkali is a base that is not soluble in water

23.

Titration is a technique that is used to find the concentrations of…

a)

metals and non-metals

b)

acids and alkalis

c)

acids and metals

d)

alkalis and metals

24.

Oxides are produced when a metal or a non-metal reacts with…

a)

carbon

b)

nitrogen

c)

oxygen

d)

hydrogen

25.

What is special about an ionic compound when it is liquid or in solution?

a)

The ions can move freely

b)

The ions vibrate in a fixed position

c)

The ions move backwards and forwards

d)

The ions cannot move

26.

Substances with a pH between 8 and 14 are…

a)

metallic

b)

alkaline

c)

acidic

d)

neutral

27.

The special word for the positively charged electrode is…

a)

the negative electrode

b)

the cathode

c)

the anode

d)

the positive electrode

28.

What equation is used to find out the concentration of a substance?

m is mass

c is concentration

a)

m = c ∕ v

b)

v = m × c

c)

c = m ∕ v

d)

c = v ∕ m

29.

When a strong acid is in aqueous solution it is completely…

(Higher Tier Question)

a)

electrolysed

b)

ionised

c)

reacted

d)

harmful

30.

What type of salt would you get in a reaction between an oxide and nitric acid?

a)

A sulfate

b)

A nitrate

c)

A chloride

d)

A carbonate

31.

What ions are released by all alkalis and bases when they react with acids?

a)

Hydrogen ion, 1+ charge

b)

Hydrogen ion, 1- charge

c)

Hydroxide ion, 1+ charge

d)

Hydroxide ion, 1- charge

32.

What is the name of the type of reaction between alkalis and acids?

a)

Neutralisation

b)

Deodorisation

c)

Destruction

d)

Fizzy

33.

As pH decreases by 1 unit, the H+ ion concentration increases by a factor of…

(Higher Tier Question)

a)

1

b)

5

c)

10

d)

0

34.

As an acid becomes stronger…

(Higher Tier Question)

a)

More H+ ions disassociate

b)

More OH- ions disassociate

c)

The acid doubles

d)

The H+ and OH- balance

35.

Metals less reactive than carbon are extracted by…

a)

reduction

b)

electrolysis

c)

distillation

d)

cracking

36.

When you electrolyse a molten ionic compound, the product at the anode is…

a)

a metal

b)

a non-metal

c)

a mixture

d)

a compound

37.

Why is an indicator used in an acid/alkali titration reaction?

a)

To show when pH7 is reached

b)

To show the pH of the acid

c)

To show the pH of the alkali

d)

To see the colour change

38.

Electrolysis is used as a method of purifying a metal when the metal is more reactive than…

a)

oxygen

b)

carbon

c)

hydrogen

d)

silver

39.

The special word for ionic compounds that are able to conduct electricity is…

a)

conductors

b)

electrolytes

c)

insulators

d)

solutions

40.

The special word for the negatively charged electrode is…

a)

the negative electrode

b)

the cathode

c)

the anode

d)

the positive electrode

41.

When H+ ions react with OH- ions they produce…

a)

air

b)

oxygen

c)

hydrogen

d)

water

42.

Substances with a pH between 1 and 6 are…

a)

metallic

b)

alkaline

c)

acidic

d)

neutral

43.

For electrolysis to work the ionic compound must…

a)

be a solid

b)

be melted or dissolved in water

c)

have a large surface area

d)

be easy to separate

44.

What type of salt would you get in a reaction between an oxide and sulfuric acid?

a)

A sulfate

b)

A nitrate

c)

A chloride

d)

A carbonate

45.

In a neutralisation reaction, an acid's H+ ions react with…

a)

OH+

b)

OH-

c)

H+

d)

H-

46.

Which electrode do the positively charged ions move to?

a)

Left

b)

Cathode

c)

Anode

d)

Right

47.

Hydrochloric acid plus magnesium react to make…

a)

magnesium oxide

b)

magnesium chloride and water

c)

magnesium chloride and hydrogen

d)

hydrogen and water

48.

Reduction is the…

(Higher Tier Question)

a)

loss of electrons

b)

gain of electrons

c)

loss of protons

d)

gain of protons

49.

Which extraction method for purifying metals involves the use of electricity?

a)

Reduction

b)

Electrolysis

c)

Distillation

d)

Cracking

50.

Substances with a pH of 7 are…

a)

metallic

b)

alkaline

c)

acidic

d)

neutral

51.

When acids are neutralised by metal carbonates, what are the products?

a)

A salt and water only

b)

A salt, water and carbon dioxide

c)

A salt and hydrogen only

d)

A salt, hydrogen and carbon dioxide

52.

What do you need to do in order to get solid salt crystals from a solution of a soluble salt?

a)

Dilute the solution

b)

Shake the solution

c)

Filter the solution

d)

Heat the solution gently

53.

A soluble salt is…

a)

a salt that dissolves in water

b)

a salt that reacts with water

c)

a salt that doesn’t dissolve in water

d)

a salt that turns purple

54.

Which extraction method for purifying metals involves the use of carbon?

a)

Reduction

b)

Electrolysis

c)

Distillation

d)

Cracking

55.

What salt would you get if you added sodium hydroxide to hydrochloric acid?

a)

Sodium sulfate

b)

Sodium nitrate

c)

Sodium chloride

d)

Sodium and water

56.

When metals are reduced by reaction with carbon, the products are a metal and…

a)

oxygen

b)

hydrogen

c)

water

d)

carbon dioxide

57.

What are the products when an acid reacts with a metal?

a)

A salt and water

b)

A salt, water and carbon dioxide

c)

A salt and hydrogen

d)

A salt, hydrogen and carbon dioxide

58.

The charges on the ions in copper(II) oxide are…

(Higher Tier Question)

a)

Cu is 2+, O is 2−

b)

Cu is 2−, O is 2+

c)

Cu is 1+, O is 1−

d)

Cu is 1-, O is 1+

59.

What type of salt would you get in a reaction between an oxide and hydrochloric acid?

a)

A sulfate

b)

A nitrate

c)

A chloride

d)

A carbonate

60.

An example of a strong acid is…

(Higher Tier Question)

a)

hydrochloric acid

b)

ethanoic acid

c)

carbonic acid

d)

benzoic acid

61.

Complete the following word equation:

Metal + Acid -->

a)

Salt + water

b)

Salt + hydrogen

c)

Salt + Water + Carbon dioxide

62.

Complete the following word equation:

Metalcarbonate + acid -->

a)

Salt + Hydrogen

b)

Salt + Water + Carbon Dioxide

c)

Salt + Water

63.

What colour does the solution turn when sulfuric acid is added to copper carbonate?

a)

Blue

b)

Green

c)

Clear

d)

Purple

64.

How do you remove the water to leave solid copper sulfate crystals?

a)

Filter

b)

Evaporate

c)

Distill

65.

What does the word insoluble mean?

a)

Does dissolve

b)

Doesn't dissolve

c)

Is part of a solid

66.

What type of reaction produced an insoluble salt?

a)

Neutralisation reaction

b)

Precipitation reaction

c)

Titration reaction

d)

Insoluble reaction

67.

What is the test for Hydrogen gas?

a)

Squeaky pop

b)

Lime water turning cloudy

c)

Add pH paper

68.

What is the test for Carbon Dioxide?

a)

Add Litmus paper

b)

Lime water turning milky

c)

Squeaky pop

69.
Which food is the most acidic?
a)
bananas
b)
lemon juice
c)
orange juice
70.
Salts that are made with hydrochloric acid are called ______________.
a)
chlorides
b)
sulfates
c)
nitrates
d)
carbonates
71.
Salts that are made with sulfuric acid are called ______________.
a)
chlorides
b)
sulfates
c)
nitrates
d)
carbonates
72.
Salts that are made with nitric acid are called ______________.
a)
chlorides
b)
sulfates
c)
nitrates
d)
carbonates
73.
What salt is produced if you react sodium hydroxide with hydrochloric acid?
a)
sodium hydroxide
b)
sodium sulfate
c)
sodium nitrate
d)
sodium chloride
74.
A salt is formed when nitric acid combines with sodium hydroxide. What is the name of the salt?
a)
Sodium chloride
b)
Sodium nitrate
c)
Hydrogen Nitrate
d)
Nirate
75.
Identify the 'evaporating basin' from the diagrams.
a)
A
b)
B
c)
C
d)
D
76.

Which salt would be formed by reacting cobalt carbonate and hydrochloric acid?

a)

Cobalt sulfate

b)

Cobalt chloride

c)

Cobalt hydroxide

d)

Cobalt sulfide

77.

When a soluble salt is formed from an acid and an insoluble base, how do you know when an excess of a base has been added?

a)

When bubbles of gas appear

b)

When the reactant all dissolves

c)

When some of the reactant is left unreacted/undissolved

d)

When a colour change happens

78.

Why do you add excess of the insoluble reactant when making a soluble salt?

a)

To make sure all the acid is used up

b)

To separate the solid from the solution

c)

To make sure a reaction occurs

d)

To have the reaction happen faster

79.

How do you separate an excess insoluble reactant from a solution?

a)

Filtration

b)

Precipitation

c)

Crystalisation

d)

Evaporation

80.

Which two chemicals could you react to make only potassium chloride and water?

a)

Potassium and hydrochloric acid

b)

Potassium hydroxide and hydrochloric acid

c)

Potassium oxide and sulfuric acid

d)

Potassium and sulfuric acid

81.

When producing a soluble salt in a reaction between an acid and an alkali, how can you prepare dry solid crystals from the solution?

a)

Filtration

b)

Neutralisation

c)

Condensation

d)

Evaporation/crystallisation

82.
What salt is produced if you react sodium hydroxide with hydrochloric acid?
a)
sodium hydroxide
b)
sodium sulfate
c)
sodium nitrate
d)
sodium chloride
83.
Identify the 'evaporating basin' from the diagrams.
a)
A
b)
B
c)
C
d)
D
84.

How do you remove the water to leave solid copper sulfate crystals?

a)

Filter

b)

Evaporate

c)

Distill

85.
Salts that are made with sulfuric acid are called ______________.
a)
chlorides
b)
sulfates
c)
nitrates
d)
carbonates
86.

What does the word insoluble mean?

a)

Does dissolve

b)

Doesn't dissolve

c)

Is part of a solid

87.

Filtration is used to separate a ______ from a liquid.

a)

undissolved solid

b)

dissolved solid

c)

dissolved gas

d)

undissolved gas

88.

Crystallisation is used to separate ____ from a liquid.

a)

undissolved liquid

b)

dissolved liquid

c)

undissolved solid

d)

dissolved solid

89.

what two pieces of equipment are required for filtration?

a)

filter and evaporating dish

b)

filter and funnel

c)

evaporating dish and bunsen burner

d)

funnel and stirring rod

90.

What piece of equipment is required for crystallisation?

a)

filter paper

b)

funnel

c)

petri dish

d)

evaporating dish

91.

What is the correct order for making a salt?

a)

dissolve metal oxide in acid -> evaporate -> filter

b)

dissolve metal oxide in acid -> filter -> evaporate

c)

filter -> dissolve metal oxide in acid -> evaporate

d)

filter -> evaporate -> dissolve metal oxide in acid

92.

(a)   is the gain of oxygen atoms.

93.

(a)   is the loss of oxygen atoms.

94.

What is the best way to extract metals that are less reactive than carbon?

a)

Bioleaching

b)

Electrolysis

c)

Phytomining

d)

Reduction reaction

95.

Is this an oxidation or reduction reaction?

water → hydrogen + oxygen

a)

Oxidation

b)

Reduction

96.

Is this an oxidation or reduction reaction?

carbon + oxygen → carbon dioxide

a)

Oxidation

b)

Reduction

97.

Which of these metals do not form an ore?

a)

Copper

b)

Gold

c)

Iron

d)

Magnesium

98.

Which element has been oxidised?

iron oxide + lithium → iron + lithium oxide

a)

iron

b)

lithium

c)

oxide

d)

lithium oxide

99.

Which element has been reduced?

iron oxide + lithium → iron + lithium oxide

a)

iron

b)

lithium

c)

oxide

d)

iron oxide

100.

Balance the following displacement reaction.


Li2O + (a)   K → K2O + 2Li

101.

In the following reaction, which element has been oxidised and which has been reduced?

copper oxide + iron → iron oxide + copper

a)

Copper has been oxidised, iron has been reduced

b)

Iron has been oxidised, copper has been reduced

102.
What is electrolysis?
a)

breaking down of a compound using a current

b)

making a compound using a current

103.
What is the name of the positive electrode?
a)
cathode
b)
anode
104.
What is the name of the negative electrode?
a)
cathode
b)
anode
105.

The negatively charged ions (anions) are attracted to the ________.

a)

anode

b)

cathode

106.

What ions are present in molten aluminium oxide?

a)

Al3+, O2-, H+, OH-

b)

Al3+, O2-

c)

Al3+, OH-

107.

Positive ions (cations) move towards the cathode (-) where they will discharge by....

a)

Breaking apart

b)

Losing electrons

c)

Clumping together.

d)

Gaining electrons

108.

An electrical circuit is set up using copper wire.

Which process takes place in the copper wire?

a)

Electrons move along the wire to the negative terminal, positive ions stay in position.

b)

Electrons move along the wire to the positive terminal, positive ions move to the negative terminal.

c)

Electrons move along the wire to the positive terminal, positive ions stay in position.

d)

Negative ions move along the wire to the positive terminal, positive ions move to the negative terminal.

109.
Which statement correctly describes the 2 electrodes?
a)
The anode is negative and the cathode is positive
b)
The anode and cathode are both positive
c)
The anode is positive and the cathode is negative
d)
The anode and cathode are both negative.
110.
What is the name given to the solution that is being electrolysed?
a)
Salt solution
b)
Electric solution
c)
Mineral solution
d)
Electrolyte
111.
Explain why the electrolyte has to be a liquid.
a)
So the ions can move
b)
So the electrons can move
c)
So that it doesn't get too hot
d)
So the fish are ok
112.
What happens at the positive electrode?
a)
Positive non-metal ions are attracted
b)
Positive metal ions are attracted
c)
Negative non-metal ions are attracted
d)
Negative metal ions are attracted
113.
When NaCl solution is electrolysed what has forms at the anode?
a)
Hydrogen
b)
Oxygen
c)
Chlorine
d)
Sodium
114.

Which apparatus could be used to electroplate an iron nail with copper?

a)

A

b)

B

c)

C

d)

D

115.

Aluminium is extracted from its oxide by electrolysis. Which words correctly complete the spaces? The oxide is dissolved in ……1…… cryolite and aluminium is deposited at the ……2……

a)

A

b)

B

c)

C

d)

D

116.

What is an ore?

a)

a solid metal

b)

a rock containing a metal combined with other elements, often oxygen

c)

an element

d)

an object used to row a boat

117.
What is the removal of oxygen from a substance called?
a)
reduction
b)
extraction
c)
electrolysis
d)
oxidation
118.
Which series is used to predict the reactions of metals with carbon and other elements?
a)
reactionary series
b)
reaction series
c)
redox series
d)
reactivity series
119.

Which element cannot be extracted from its ore by reduction with carbon?

a)

iron

b)

aluminium

c)

copper

d)

zinc

120.

Which of these metals was the last to be discovered?

a)

Potassium

b)

Copper

c)

Silver

d)

Platinum

121.

Which of these metals requires the most energy to be separated from its ore?

a)

copper

b)

silver

c)

potassium

d)

aluminium

122.

If an aqueous solution of copper (II) sulphate is electrolysed what will be the product at the cathode?

a)

hydrogen gas

b)

sulphur

c)

copper metal

d)

water

123.

At the anode if OH- ions and Cl ions are present what will be formed ?

(Halides are group 7 (Cl-, Br- I- ions)

a)

hyddrogen

b)

oxygen gass and water

c)

chlorine gas

124.

Complete the diagram with the following labels:

a)Aluminium oxide
b)Carbon anode
c)Molten aluminium
1
2
3
1)
2)
3)
125.

Aluminum ions are attracted to the

a)

anode

b)

cathode

126.

The anode has to be replaced frequently because

a)

The oxygen reacts with the carbon anode to form carbon dioxide

b)

Aluminum reacts with the carbon to form aluminum carbide

c)

The anode gets impurities that impact the extraction

d)

The anode is too hot and it will reduce their electrical conductivity

127.
What is an ore?
a)
a solid metal
b)
a rock cantaining a metal combined with other elements
c)
an element
d)
an object used to row a boat
128.
Which of these elements is unlikely to be found native?
a)
gold
b)
platinum
c)
aluminium
d)
silver
129.
Which element cannot be extracted from its ore by reduction with carbon?
a)
iron
b)
aluminium
c)
copper
d)
lead
130.

Label the diagram

a)Wire
b)Beaker
c)D.C power supply
d)Cathode
e)Anode
f)Electrolyte
1
2
3
4
5
6
1)
2)
3)
4)
5)
6)
131.

The extraction of aluminium by electrolysis is very hot as the aluminium oxide is dissolved in cryolite. The oxygen produced at the anode reacts with the graphite to form what gas?

a)

Carbon

b)

Carbon dioxide

c)

Hydrogen

d)

Oxygen

132.
What is electrolysis?
a)
breaking down of a compound using a current
b)
making a compound using a current
133.

What ions are present in molten aluminium oxide?

a)

Al3+, O2-, H+, OH-

b)

Al3+, O2-

c)

Al3+, OH-

134.

The electrodes in electrolysis of aluminium are made of

a)

Steel

b)

Anodes

c)

Graphite

d)

Plastic

135.

What is the ore of aluminium called? (a)  

Choose from the below words
Baxite
Bauxite
Cryolite
Malachite
136.

Oxidation is the _________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

137.

Reduction is the (a)   of electrons.

Choose from the below words
loss
gain
sharing
transfer
138.

Choose the half-equation that shows the discharge of aluminium ion.

a)

Al3+ - 3e- → Al

b)

Al2+ + 3e- → Al

c)

Al3+ + 3e- → Al

d)

Al3+ → Al + 3e-

139.
What is the range of pH values in an acidic solution?
a)
0-6
b)
8-14
c)
15-239058204958
d)
pH = 7
140.

What are the reactants for the reaction of magnesium with oxygen

Magnesium + oxygen --> Magnesium oxide

a)

Magnesium

b)

Oxygen

c)

Magnesium oxide

d)

Magnesium and oxygen

141.
An acid reacts with metal to produce 
a)
Carbon dioxide 
b)
Hydrogen gas
c)
Hydrogen gas and water 
d)
Salt and hydrogen gas 
142.
A neutralisation reaction is a reaction between 
a)
Acid and a Base 
b)
Acid and water 
c)
Base and water 
d)
None of the above 
143.
An acid reacts with a metal carbonate to produce 
a)
Salt, water and hydrogen gas
b)
Salt, water and carbon dioxide
c)
Limewater
d)
Salt and water 
144.
A neutralisation reaction produces 
a)
An acid 
b)
A neutral substance 
c)
Only water 
d)
Salt and water 
145.
Complete the following reaction:
Sulphuric acid + sodium carbonate
--> 
a)
Carbon dioxide + water 
b)
calcium carbonate + water + carbon dioxide 
c)
Sodium sulphate + water + carbon dioxide 
d)
Sodium chloride + water + carbon dioxide 
146.
Complete the following reaction:
Hydrochloric acid + magnesium hydroxide --> 
a)
Magnesium chloride + water 
b)
Magnesium + water
c)
Magnesium chloride + hydrogen gas 
d)
Magnesium chloride + water + carbon dioxide 
147.

How do we test for hydrogen?

a)

Squeaky pop test

b)

Hydrogen extinguishes a lit splint

c)

Bubbling through lime water

d)

Hydrogen makes a glowing splint relight

148.

Calcium carbonate + hydrochloric acid -->

a)

Calcium chloride + hydrogen

b)

Calcium choride + water

c)

Calcium chloride + carbon dioxide + water

d)

Calcium sulfate + carbon dioxide + water

149.

Copper carbonate + hydrochloric acid -->

a)

Copper chloride + hydrogen

b)

Copper chloride + water

c)

Copper chloride + water + hydrogen

d)

Copper chloride + water + carbondioxide

150.
Values from 0-14 that determine the acidity of a solution
a)
Molarity
b)
Polarity
c)
pH scale
d)
Solubility
151.
If the pH of a solution is 9, it is a....
a)
acid
b)
base
c)
both
d)
none
152.

Hydrochloric acid reacts to form ........ salts.

a)

chloride

b)

hydrochloride

c)

nitrate

d)

sulfate

153.

Nitric acid reacts to form ........ salts.

a)

chloride

b)

nitrite

c)

nitrate

d)

sulfate

154.

Sulfuric acid reacts to form ........ salts.

a)

chloride

b)

nitrite

c)

sulfite

d)

sulfate

155.

acid + base -> salt + ............

a)

carbon dioxide

b)

hydrogen

c)

ammonia

d)

water

156.

acid + metal -> salt + ............

a)

carbon dioxide + water

b)

hydrogen

c)

ammonia + water

d)

water

157.

Which acid reacts with potassium hydroxide to form potassium sulfate?

a)

chloric acid

b)

hydrochloric acid

c)

nitric acid

d)

sulfuric acid

158.

Which acid reacts with calcium hydroxide to form calcium nitrate?

a)

chloric acid

b)

hydrochloric acid

c)

nitric acid

d)

sulfuric acid

159.

Oxides and hydroxides are

a)

bases

b)

carbonates

c)

acids

d)

metals

160.

What are the products formed when zinc + ethanoic acid react?

a)

magnesium chloride and water

b)

aluminium chloride and hydrogen gas

c)

aluminium chloride and water

d)

zinc ethanoate and hydrogen gas

161.

Which of the following describes a precipitate?

a)

a liquid forms when a block of metal is heated

b)

a solid forms when one liquid is poured into another

c)

a gas forms when a solid is placed in a liquid

d)

bubbles form when an acid is poured on a rock

162.

What is the difference between base and alkali

a)

Alkalis are water insoluble bases

b)

Alkalis are water soluble bases

c)

Both are same

d)

Alkali react with acids while bases don't.

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