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Worksheets

CHEMISTRY WK4 YR 10

Total questions: 160

Worksheet time: 3hrs 56mins

Name
Class
Date
1.
Which consists of carbon atoms?
a)
graphite
b)
diamond
c)
fullerene
d)
all of these
2.

Define the term allotropes

a)

Atoms with same proton number but different number of neutrons

b)

Atoms with same proton number but different mass number

c)

Atoms in different arrangement but same structure

d)

Atoms in different arrangement and different structural form

3.

The use of diamond in abrasives is due to its

a)

high melting point

b)

hardness

c)

octahedral shape

d)

durability

4.

Graphite and diamond are similar in that they

a)

have octahedral shape

b)

have same density

c)

form carbon(IV) oxide o combustion

d)

conduct electricity

5.

Which of the allotropes of carbon is a constituent of a lead pencil?

a)

Graphite

b)

Diamond

c)

Lampblack

d)

Soot

6.

The 'gasification of coke' is used for the manufacture of

a)

producer gas

b)

natural gas

c)

synthetic gas

d)

industrial gas

7.

Which of the following compounds is a neutral oxide?

a)

Carbon(IV) oxide

b)

Carbon(II) oxide

c)

Sulphur (IV) oxide

d)

Sulphur (VI) oxide

8.

A form of carbon used for absorbing poisonous gases and purification of noble gases is

a)

wood charcoal

b)

animal charcoal

c)

carbon fibres

d)

carbon black

9.

Synthetic gas is a mixture of

a)

CH4 and H2O

b)

CH4 and H2

c)

CO and H2

d)

CO2 and H2

10.

The allotropes of carbon used in the decolourisation of sugar of

a)

graphite

b)

soot

c)

charcoal

d)

lamp black

11.

When steam is passed over red - hot carbon, the substances produced are

a)

hydrogen and trioxocarbonate(IV) acid

b)

hydrogen, oxygen and carbon(II)oxide

c)

hydrogen and carbon(II) oxide

d)

hydrogen and carbon(IV) acid

12.

Carbon is tetravalent because

a)

electrons in both the 2s and 2p orbitals are equivalent

b)

the electrons in all the orbitals of carbon are equivalent

c)

the 2s and 2p orbitals hybridised

d)

all the atomic orbitals of carbon hybridise

13.
Which consists of carbon atoms?
a)
graphite
b)
diamond
c)
fullerene
d)
all of these
14.
Which has a 2D hexagonal layered structure?
a)
graphite
b)
diamond
c)
fullerene
d)
all of these
15.
Which has a every carbon atom covalently bonded to three others?
a)
graphite
b)
diamond
c)
fullerene
d)
two of these
16.
What structure is shown in the diagram?
a)
Diamond
b)
Graphite
17.
Which has weak dispersion forces in between layers?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
18.
Which has a free delocalized electron between layers that gives rise to electrical conductivity ?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
19.
Which is used in pencils ?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
20.
Which is used as electrodes in an electrochemical cell?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
21.
Which has a 3D hexagonal structure?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
22.
Which has every carbon atom covalently bonded to four other atoms?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
23.
Which is extremely hard?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
24.
Which is used as a cutting tool and in jewelry?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
25.
Which has the formula C60?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
26.
Which is made of balls or cages of carbon?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
27.
Which is a semiconductor?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
28.
Define the term allotropes
a)
Atoms with same proton number but different number of neutrons
b)
Atoms with same proton number but different mass number
c)
Atoms in different arrangement in structure
d)
Atoms in different arrangement and different physical form
29.
What kind of bonding does atoms in graphite has?
a)
Covalent bonding with all atoms
b)
Each carbon, bonded covalently to 3 other carbon atoms in a 3D lattice
c)
Each carbon, bonded covalently to 4 other carbon atoms.
d)
Each carbon, bonded covalently to 3 other carbon atom in 2D held by intermolecular
30.
Which of the following is true about C60 ?
a)
Each carbon bonded covalently to 3 other carbon atoms in a hexagonal ball like structure
b)
Each carbon bonded covelently to 4 other carbon atoms in layers
c)
a giant lattice structure
d)
pentagonal in shape
31.
What structure is shown in the diagram?
a)
Diamond
b)
Graphite
c)
fullerene
32.
Which statement is a true comparison of diamonds and graphite?
a)
diamonds are extremely hard and colorless where as graphite is a very soft gray substance. 
b)
diamonds are extremely soft and colorless where as graphite is a very hard gray substance.
c)
Diamonds are made only from carbon where as graphite is a carbon compound containing metal electrons
33.
which answer shows the correct number of C-C covalent bonds in its allotropes? 
a)
Diamond 3, Graphite 3, fullerene 3
b)
Diamond 4, Graphite 3, fullerene 3
c)
Diamond 4, Graphite 3, fullerene 4
d)
Diamond 4, Graphite 4, fullerene 3
34.

Define the term allotropes

a)

Atoms with same proton number but different number of neutrons

b)

Atoms with same proton number but different mass number

c)

Atoms in different arrangement but same structure

d)

Atoms in different arrangement and different structural form

35.

Graphite, diamond and Buckminsterfullerene are all allotropes of

a)

Berylium

b)

Silicon

c)

Germanium

d)

Carbon

36.
Which has a 2D hexagonal layered structure?
a)
graphite
b)
diamond
c)
fullerene
d)
all of these
37.

Which has a every carbon atom covalently bonded to three others?

a)

graphite

b)

diamond

c)

fullerene

d)

graphene

38.
Which has a free delocalized electron between layers that gives rise to electrical conductivity ?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
39.
Which has weak dispersion forces in between layers?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
40.

Which has a 3D tetrahedral structure?

a)

graphite

b)

diamond

c)

fullerene

d)

none of these

41.
What structure is shown in the diagram?
a)
Diamond
b)
Graphite
42.
Which consists of carbon atoms?
a)
graphite
b)
diamond
c)
fullerene
d)
all of these
43.
Which is used in pencils ?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
44.
Which has every carbon atom covalently bonded to four other atoms?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
45.
Which is extremely hard?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
46.
Which has the formula C60?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
47.
Which is made of balls or cages of carbon?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
48.
What structure is shown in the diagram?
a)
Diamond
b)
Graphite
c)
fullerene
49.
Which statement is a true comparison of diamonds and graphite?
a)
diamonds are extremely hard and colorless where as graphite is a very soft gray substance. 
b)
diamonds are extremely soft and colorless where as graphite is a very hard gray substance.
c)
Diamonds are made only from carbon where as graphite is a carbon compound containing metal electrons
50.

Graphite is soft because

a)

it has strong covalent bonds

b)

its layers can slide over one another due to weak forces between the layers

c)

it has weak van der Waals forces between layers

d)

it is used as a lubricant

51.
Which has a free delocalized electron between layers that gives rise to electrical conductivity ?
a)
graphite
b)
diamond
c)
fullerene
d)
none of these
52.

Which of the following Allotropes of Carbon are good lubricators?

a)

Graphite

b)

Graphene

c)

Diamond

53.

Why can diamond not conduct electricity and heat?

a)

because each carbon is bonded to 3 others

b)

because it has a sea of delocalised electrons around it

c)

because all electrons are bonded in strong covalent bonds

d)

because atoms form weakly attracted layers

54.
Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?
a)
strongly acidic
b)
slightly acidic
c)
strongly basic
d)
slightly basic
55.

The table shows the pH of several solutions. Which solution is the most acidic?

a)

vinegar

b)

milk

c)

water

d)

bleach

56.

Zn(OH)2 is an example of a...

a)

acid

b)

base

c)

salt

d)

water

57.

H3PO4 is an example of a ...

a)

acid

b)

base

c)

salt

d)

non-electrolyte

58.

Four substances were tested for pH, lemon juice (pH 2), baking soda (pH 9), bleach (pH 12), and milk (pH 6). Which of the following correctly lists the substances from most basic to acidic?

a)

lemon juice, milk, baking soda, bleach

b)

bleach, baking soda, milk, lemon juice

c)

milk, lemon juice, baking soda, bleach

d)

baking soda, bleach, lemon juice, milk

59.

At what pH would all three indicators appear as yellow?

a)

1.7

b)

2.7

c)

4.7

d)

8.7

60.

Phenolphthalein is pink in an aqueous solution having a pH of

a)

2

b)

7

c)

5

d)

12

61.

Based on the results of testing colorless solutions with indicators, which solution is MOST acidic?

a)

a solution in which bromthymol blue is blue

b)

a solution in which bromcresol green is blue

c)

a solution in which phenolphthalein is pink

d)

a solution in which methyl orange is red

62.

If a solution has a pH of 1.5, then litmus would turn

a)

red

b)

purple

c)

blue

d)

yellow

63.

If a solution has a pH of 10, then methyl orange would turn

a)

red

b)

yellow

c)

orange

d)

blue

64.

According to the diagram, what is the color of bromcresol green at the pH of the mouth?

a)

Yellow

b)

Blue

c)

Green

d)

Red

65.
An indicator will ______________ when it is in contact with an acid or base
a)
Bubble
b)
Form a new substance
c)
Change color
d)
Stay the same color
66.

According to the diagram, which part of the digestive system has the most basic enviroment?

a)

Mouth

b)

Stomach

c)

Pancreas

d)

Small intestine

67.

Which pair of compounds represents one Arrhenius acid and one Arrhenius base?

a)

CH3OH and NaOH

b)

CH3OH and HCl

c)

HNO3 and NaOH

d)

HNO3 and HCl

68.

A solution with a pH of 7.8 is first tested with bromthymol blue and then with phenolphthalein. What is the color

of each indicator in this solution?

a)

Bromthymol blue is yellow and phenolphthalein is colorless.

b)

Bromthymol blue is blue and phenolphthalein is colorless.

c)

Bromthymol blue is yellow and phenolphthalein is pink.

d)

Bromthymol blue is blue and phenolphthalein is pink.

69.

The compound KOH can be described as an

a)

Arrhenius acid and an electrolyte

b)

Arrhenius base and an electrolyte

c)

Arrhenius acid and a nonelectrolyte

d)

Arrhenius base and a nonelectrolyte

70.

What is the color of the indicator thymol blue after it is added to an aqueous solution of vitamin C, also known ascorbic acid?

a)

Yellow

b)

Blue

c)

Red

d)

Pink

71.

Which indicator, when added to a solution, changes color from yellow to blue as the pH of the

solution is changed from 5.5 to 8.0?

a)

bromcresol green

b)

bromthymol blue

c)

litmus

d)

methyl orange

72.

According to the diagram, which indicator would turn yellow at the pH of the pancreas?

a)

methyl orange

b)

bromthymol blue

c)

bromcresol green

d)

litmus

73.

Which substance is always a product when an Arrhenius acid in an aqueous solution reacts with an

Arrhenius base in an aqueous solution?

a)

HBr

b)

KBr

c)

H2O

d)

KOH

74.
Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?
a)
strongly acidic
b)
slightly acidic
c)
strongly basic
d)
slightly basic
75.

Zn(OH)2 is an example of a...

a)

acid

b)

base

c)

salt

d)

water

76.

H3PO4 is an example of a ...

a)

acid

b)

base

c)

salt

d)

non-electrolyte

77.

If a solution has a pH of 1.5, then litmus would turn

a)

red

b)

purple

c)

blue

d)

yellow

78.

Which substance is always a product when an Arrhenius acid in an aqueous solution reacts with an

Arrhenius base in an aqueous solution?

a)

HBr

b)

KBr

c)

H2O

d)

KOH

79.

Match

a)

H+

1.

Acid

b)

OH-

2.

Base

c)

NaCl

3.

Salt

80.

Select the name of the following acid: HF

a)

Hydrofluoric acid

b)

Fluorous acid

c)

Fluoric acid

d)

Flourine acid

81.
Select the name for the following acid: H3PO4
a)
Phosphoric acid
b)
Phosphorous acid
c)
Hydrophosphoric acid
82.
Select the formula for the following acid: nitrous acid
a)
HNO2
b)
HNO3
c)
H3N
83.
Select the formula for the following base: sodium hydroxide
a)
NaOH
b)
Na(OH)2
c)
NaH
84.
Select the name for the following base: Cu(OH)2
a)
Copper (II) hydroxide
b)
Copper (I) hydroxide
c)
Copper (II) hydride
d)
Copper (I) hydride
85.

What does pH measure?

a)

the concentration of OH- ions

b)

the concentration of salt ions

c)

the concentration of H+ ions

86.

The pH of 4 solutions were measure in a lab. Which of the solutions is the most basic (alkaline)?

a)
b)
c)
d)
87.

What characteristic of a substance has to change in order for it to act as an indicator?

a)

concentration

b)

color

c)

temperature

d)

taste

88.

Which salt is formed in a reaction between HBr and LiOH?

a)

LiBr

b)

BrLi

c)

NaCl

d)

NaOH

89.

Acids taste .....

a)

sour

b)

bitter

c)

sweet

d)

umami

90.

Reaction between acid and alkali producing salt and water:

a)

Combustion

b)

Neutralization

c)

Precipitation

d)

Decomposition

91.

The color of universal indicator in hydrochloric acid:

a)

Red

b)

Blue

c)

Purple

d)

Green

92.

Add dilute sulphuric acid slowly to a small amount of copper oxide in a watch glass with stirring. What do you observe in the above reaction?

a)

Copper oxide present in the watch glass dissolves in dilute H2SO4 and the colour of the solution becomes blue.

b)

Copper oxide present in the watch glass insoluble in dilute H2SO4 and the colour becomes black.

c)

Copper oxide present in the watch glass dissolves in dilute H2SO4 and the colour of the solution becomes crimson red.

d)

Copper oxide present in the watch glass dissolves in dilute H2SO4 and the colour of the solution becomes yellow.

93.

A compound of a calcium reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle; turns lime water milky. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.

a)

CaO + 2HCl ⇨ CaCl2 + CO2 + H2O

b)

CaCO3 + 2HCl ⇨ CaCl2 + CO2 + H2

c)

CaCO3 + 2HCl ⇨ CaCl2 + O2 + H2O

d)

CaCO3 + 2HCl ⇨ CaCl2 + CO2 + H2O

94.

A student reacted hydrochloric acid with sodium hydroxide, until the solution was neutral. Next he evaporated, the water from the beaker. She noticed that white crystals remained in the bottom of the beaker. The crystals were most likely…

a)

alkali

b)

acid

c)

water

d)

salt

95.
A salt is formed when nitric acid combines with sodium hydroxide. What are present in the salt that forms?
a)
Sodium chloride
b)
sodium ions and nitrate ions
c)
only sodium ions
d)
only nitrate ions
96.
Pickles form by soaking in an acid. What are some properties of pickles
a)
Conducts electricity, bitter, turns litmus blue
b)
Slippery, sour, turns litmus blue
c)
Slippery, bitter, turns litmus blue
d)
Sour, turns litmus red, can conduct electricity
97.
BASE + ACID ----> SALT +?
a)
water
b)
oxygen
c)
hydrogen ion
d)
hydroxide ion
98.

Which of the following are CHEMICAL properties of acids?

a)

Reacts with metals to form salt and hydrogen gas

b)

Reacts with metal carbonates to form salt, water and carbon dioxide gas.

c)

Reacts with bases to form salt and water only

d)

Tastes sour

99.

potassium nitrate is a _________ salt.

a)

soluble SPA

b)

soluble non-SPA

c)

insoluble salt

100.

Which method is used to prepare potassium nitrate?

a)

titration

b)

add excess solid reagent to acid

c)

precipitation

101.

Which of the following is NOT a step in titration?

a)

Fill up a burette with some acid.

b)

Use a pipette to measure 25.0 cm3 of alkali.

c)

Add two drops of methyl orange indicator to the alkali.

d)

Filter the mixture to obtain the residue.

e)

Repeat the titration with the same volumes of acid and alkali but without the indicator.

102.

Choose two reagents that can be used to prepare potassium nitrate.

a)

dilute hydrochloric acid

b)

dilute nitric acid

c)

aqueous potassium hydroxide

d)

potassium metal

e)

aqueous potassium nitrate

103.

copper(II) chloride is a _________ salt.

a)

soluble SPA

b)

soluble non-SPA

c)

insoluble salt

104.

Which method is used to prepare copper(II) chloride?

a)

titration

b)

add excess solid reagent to acid

c)

precipitation

105.

Explain why the following steps are carried out to obtain pure and dry sample of copper(II) chloride crystals.

a)
Add excess copper(II) oxide to hydrochloric acid.
1.

To ensure acid is fully reacted

b)

Filter the mixture.

2.

To remove excess copper(II) oxide

c)

Heat filtrate until it is saturated & allow it to cool.

3.

So that the crystals will form and, not decompose

d)

Wash the crystals with a little cold water & dry between filter paper.

4.

To remove impurities and obtain pure, dry crystals

106.

Select two other reagents that can react with hydrochloric acid to form copper(II) chloride.

a)

Copper metal

b)

Copper(II) carbonate

c)

Copper(II) hydroxide

d)

Copper(II) nitrate

e)

Copper(II) sulfate

107.

Calcium sulfate is a/an _________ salt.

a)

soluble SPA

b)

soluble non-SPA

c)

insoluble salt

108.

Which method is used to prepare calcium sulfate?

a)

titration

b)

add excess solid reagent to acid

c)

precipitation

109.

Choose two reagents that can be used to prepare calcium sulfate by precipitation.

a)

Calcium metal

b)

Aqueous calcium nitrate

c)

Aqueous sodium sulfate

d)

Calcium carbonate

e)

Barium sulfate

110.

Arrange the steps carried out in precipitation to obtain pure and dry sample of calcium sulfate.

a)

Mix aqueous solutions of sodium sulfate and calcium nitrate together.

b)

Filter the mixture to obtain calcium sulfate as the residue.

c)

Wash the residue (precipitate) with distilled water.

d)

Dry the precipitate between pieces of filter paper.

1)
2)
3)
4)
111.

What type of reaction produced an insoluble salt?

a)

Neutralisation reaction

b)

Precipitation reaction

c)

Titration reaction

d)

Insoluble reaction

112.

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

113.

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

114.

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

a)

Filtration

b)

Precipitation

c)

Crystalisation

d)

Evaporation

115.

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

116.

What is the purpose of a titration when making pure salts?

a)

To test if reactants react.

b)

To determine the exact quantities needed for neutralisation

c)

To calculate the concentration of the salt

d)

To test quality of reactants.

117.

Complete the following word equation:

Metal + Acid -->

a)

Salt + water

b)

Salt + hydrogen

c)

Salt + Water + Carbon dioxide

118.
Salts that are made with hydrochloric acid are called ______________.
a)
chlorides
b)
sulfates
c)
nitrates
d)
carbonates
119.
Salts that are made with nitric acid are called ______________.
a)
chlorides
b)
sulfates
c)
nitrates
d)
carbonates
120.
What salt is produced if you react sodium hydroxide with hydrochloric acid?
a)
sodium hydroxide
b)
sodium sulfate
c)
sodium nitrate
d)
sodium chloride
121.

pH is the measure of the concentration of ______.

a)

Acids

b)

H+ ion

c)

OH- ion

d)

Bases

122.

What is the definition of an ACID?

a)

a substance that contains hydroxide and ionizes to produce OH-

b)

a substance that contains hydrogen and ionizes to produce H+

c)

a substance that contains hydrogen and ionizes to produce OH-

d)

a substance that contains hydroxide and ionizes to produce H+

123.
If a solution is basic which ion will be more present?
a)
H+
b)
K+
c)
OH-
d)
H-
124.

A substance that changes colour when mixed with an acid or base is a(n) ___.

a)

indicator

b)

neutraliser

c)

corrosive

d)

electricity

125.
What color does litmus paper turn in the presence of an acid?
a)
blue
b)
black
c)
green
d)
red
126.
Bases are located where on the pH scale?
a)
any number can be a base
b)
below 7
c)
above 7
d)
number 7 is a base
127.

When making an insoluble salt, why do we wash the filter paper with distilled water?

a)

to remove insoluble impurities

b)

to remove soluble impurities

c)

to rinse more product through the filter paper

d)

to make a more dilute solution

128.

When carrying out a titration, what is the name of the equipment used to add incremental amounts of acid to the conical flask?

a)

glass pipette

b)

measuring cylinder

c)

separating funnel

d)

burette

129.

What is the colour change observed with phenolphthalein when adding acid to alkali?

a)

pink --> colourless

b)

blue --> red

c)

orange --> pink

d)

green --> yellow

130.

Which of the following is the correct definition for a strong acid?

a)

Partially dissociates into ions when dissolved in water

b)

Fully dissociates into ions when dissolved in water

c)

a larger proportion of acid to water molecules

d)

a smaller proportion of acid to water molecules

131.

Salts

a)

are formed from joining positive and negative ions.

b)

increase OH- ions.

c)

forms a salt and water.

d)

increases H2O ions.

132.

A salt is formed when nitric acid combines with sodium hydroxide. What are present in the salt that forms?

a)

Sodium chloride

b)

sodium ions and nitrate ions

c)

only sodium ions

d)

only nitrate ions

133.

Which of the following is NOT part of the definition of salt?

a)

Ionic compound

b)

when hydrogen ion of an acid

c)

is replaced by a metal cation or ammonium ion

d)

contains hydrogen ions

134.

What is the correctly written chemical formula for the ionic compound, strontium oxide?

[Hint: strontium, Sr is in Group 2]

a)

Sr2O

b)

SrO2

c)

Sr2O2

d)

SrO

135.

Salts that are made with hydrochloric acid are called ______________.

a)

chlorides

b)

sulfates

c)

nitrates

d)

carbonates

136.

Which of the following statements best define the term ‘salt’?

a)

Salt is formed when metal reacts with an alkali.

b)

Salt contains sodium ions and chloride ions.

c)

Salt is formed from a weak Van der Waals’ forces of attraction.

d)

Salt is formed when the hydrogen ions in an acid is replaced by metal or ammonium ions.

137.

Which of the following are the physical characteristics of salt crystal?


I They have similar size.

II They have fixed angle.

III They have fixed geometrical shapes.

IV They have flat surface, straight edges and sharp angles.

a)

I, II and III

b)

I, II and IV

c)

I, III and IV

d)

II, III and IV

138.

What are the products if magnesium reacts with hydrochloric acid?

a)

Magnesium chloride + Hydrogen

b)

Magnesium sulfate + Hydrogen

c)

Magnesium oxide + Hydrogen

d)

Magnesium sulfide + Hydrogen

139.

Which of the following preparation of salt is incorrect?

a)

acid + alkali

b)

acid + metal oxide

c)

acid + carbonate

d)

acid + acid

140.

Which of the following is not a use of a salt as a food preservative?

a)

ammonium sulphate, (NH4)2SO4 to preserve fruit jam

b)

common salt, NaCl to prepare salted fish

c)

sodium benzoate, C6H5COONa to preserve sauces

d)

sodium nitrite, NaNO2 to preserve sausages

141.

Select the properties of acids:

a)

turns blue litmus red

b)

corrosive

c)

soluble in water

d)

proton acceptor

142.

Bases are _________ or _________ of metals

(a)  

143.

TRUE OR FALSE: Alkalis are a sub group in the large family of bases.

a)

false

b)

true

144.

Calcium hydroxide is a well known ​ (a)   with low ​ (b)   in water unlike other ​ (c)  

Choose from the below words
base
solubility
alkalis
145.

Match the following

a)

methyl orange

1.

in acids - red and alkalis - yellow

b)

litmus

2.

in acids - red and alkalis - blue

c)

thymolphthalein

3.

in acids - colourless and alkalis - blue

146.

solutions of acids x and y have the same concentrations. X has pH 2.5. Y has pH 5.3. Which one is a weak acid, explain your reasoning:

4 lines
147.

Metal + acid -----------> _________ + ________

(a)  

148.

Acid + base -------> _______ + _________

(a)  

149.

Name the products of the following reaction:

Calcium carbonate + Hydrochloric acid

a)

calcium chloride + water

b)

calcium carbonate + carbon dioxide

c)

calcium chloride + hydrogen

d)

calcium chloride + carbon dioxide + water

150.

A compound X on reaction with a test tube of copper (II) oxide produced a blue coloured solution, releasing a colourless gas which puts out a burning splint with a pop sound. Identify the compound:

a)

salt

b)

base

c)

acid

d)

alkali

151.

Name the reaction which takes place between an acid and a base

a)

displacement

b)

neutralization

c)

double displacement

d)

redox reaction

152.

Identify the practical application of neutralization reactions in daily life:

a)

Paint industry

b)

tooth paste

c)

indigestion tablets

d)

adding limestone/lime to soil

153.

Write the ionic equation for a neutralization reaction:

154.

Complete the following reaction:

CuO + HCl -----------> ________ + __________

155.

Match the following

a)

Basic oxides

1.

formed by metals reacting with oxygen

b)

acidic oxide

2.

formed by non metals reacting with oxygen

c)

neutral oxide

3.

Carbon monoxide

d)

Amphoteric oxide

4.

Aluminium oxide

156.

TRUE OR FALSE: Acidic oxides dissolve in water while basic oxides are insoluble

a)

true

b)

false

157.

Match the following : Making salts

a)

ZnSO4

1.

reaction of acid with metal

b)

CuSO4

2.

reaction of insoluble base or carbonate with acid

c)

BaSO4

3.

precipitation reaction between soluble salt

d)

NaCl

4.

Titration between an acid and base using an indicator

158.

Complete the following equation and balance it:

Ca(OH)2 + 2NH4 Cl -----> _________ + __________ + _________

159.

What is the number of water of crystallization in Copper sulphate crystals?

a)

3

b)

2

c)

5

d)

4

160.

Find the concentration of a solution of hydrochloric acid, by titration against a 1 mol/dm3 solution of sodium carbonate. Use the data below for calculation:

volume of acid used:

initial burette reading : 1.0 cm3

Final burette reading: 28.8 cm3

Volume of acid used: 27.8 cm3

4 lines

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