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Grade 9 chem revision

Total questions: 147

Worksheet time: 4hrs 41mins

Name
Class
Date
1.

Habers process is the name for the manufacture of

a)

Sulphuric acid

b)

Ammonia

c)

Nitrogen

d)

Hydrogen

2.

Identify the raw materials used for this process

a)

Hydrogen

b)

Oxygen

c)

Nitrogen

d)

Ammonia

3.

Identify the temperature, pressure conditions and catalyst used

a)

Iron, 450 deg C, 200 atm

b)

Iron, 400 atm, 200 deg C

4.

Identify the correct balanced chemical equation for the reaction

a)

2N3+3H2 ⟷ 2NH32N_{3_{ }}+3H_2\ \longleftrightarrow\ 2NH_3  

b)

N2 +H2↔ NH3N_{2_{\ }}+H_{2_{ }}\leftrightarrow\ NH_3  

c)

N2 +3H2 ↔ 2NH3N_{2\ }+3H_2\ \leftrightarrow\ 2NH_3  

d)

2N +3H2 ↔ 2NH32N\ +3H_2\ \leftrightarrow\ 2NH_3  

5.

Hydrogen for the Haber process is made from

a)

Methane in natural gas

b)

Ethane in natural gas

6.

If we increase the pressure, what will happen to the reaction

Hint- High pressure favors less moles production

a)

More ammonia will be produced

b)

Less ammonia will be produced

c)

Nothing will change

7.

What is a reversible reaction?

a)

A reaction with oxidation and reduction

b)

A reaction with a forward and backward reaction

c)

A reaction with electron loss and gain

d)

A reaction that goes in reverse

8.

Which statement about the manufacture of ammonia by the Haber Process is correct?

a)

The reactants and product are solids

b)

The reactants and product are gases.

c)

The reactants and product are liquids

9.

In Haber’s process  Nitrogen is obtained from air

by Fractional distillation.

a)

True

b)

False

10.

In Haber’s process  Hydrogen  is obtained from 

“STEAM REFORMING” of natural gas (ETHANE)

a)

True

b)

False

11.

Write the name of catalyst used in Haber's process.

(a)  

12.

Ammonia is used for:

a) Nylon

b) Fertilizer

c) Nitric acid

d) Perfumes

a)

a and b

b)

b, c and d

c)

a, b and c

d)

c and d

13.

Nitrogen + hydrogen −> ammonia is exothermic .

What will happen if we increase the temperature.

Hint- increasing temperature will favor endothermic reaction

a)

There will be no change in ammonia production

b)

Less ammonia will be produced

c)

More ammonia will be produced

14.

What are the optimum conditions for the Haber process?

a)

200 atm and 450°C

b)

450 atm and 200°C

15.

The hydrogen and nitrogen are mixed together in a

a)

3:3 ratio

b)

3:1 ratio

16.

Which equation represents the formation of ammonia?

a)

N2 + H2  ↔  NH3N_2\ +\ H_2\ \ \leftrightarrow\ \ NH_3

b)

N+ 3H  ↔  NH3N+\ 3H\ \ \leftrightarrow\ \ NH_3

c)

N2 + 3H2  ↔  2NH3N_2\ +\ 3H_2\ \ \leftrightarrow\ \ 2NH_3

d)

3N2 + H2  ↔  2NH33N_2\ +\ H_2\ \ \leftrightarrow\ \ 2NH_3

17.

Nitrogen used in the Haber process is obtained from

a)

Fractional distillation of air

b)

Fractional distillation of crude oil

c)

Electrolysis of water

d)

Reduction of nitrogen oxide by carbon

18.

Select all the raw materials for the Contact process.

a)

Sulfur

b)

Oxygen from air

c)

Hydrogen

d)

Water

19.

The Contact process is used for the manufacture of...

a)

Sulfur

b)

Sulfur dioxide

c)

Sulfur trioxide

d)

Sulfuric acid

20.

Name the catalyst used in the Contact process.

a)

Finely-divided Iron

b)

Vanadium (V) Oxide

c)

Nickel

d)

Chromium

21.

What is the pH of sulfuric acid?

a)

pH 2

b)

pH 7

c)

pH 8

d)

pH 13

22.

Which of the following is NOT a raw material for the Contact process?

a)

Sulfur

b)

Air

c)

Hydrogen

d)

Water

23.

What is the formula of sulfuric acid?

a)

H2SO4

b)

HSO4

24.
Describe the appearance of elemental sulfur
a)
a yellow gas
b)
a yellow powder
c)
a green liquid
d)
a blue solid
25.

The Haber process is the industrial process for making...

a)

Ammonia

b)

Sulfuric Acid

c)

Margarine

d)

Salts

26.

What is a reversible reaction?

a)

A reaction with oxidation and reduction

b)

A reaction with a forward and backward reaction

c)

A reaction with electron loss and gain

d)

A reaction that goes in reverse

27.
Hydrogen for the Haber process is made from
a)
Methane in natural gas
b)
Fractional distillation of air
c)
Fractional distillation of crude oil
d)
Electrolysis
28.

What are the usual conditions of the Haber Process

a)

450'C, 550 atm, Iron Catalyst

b)

100'C, 200 atm, Diamond Catalyst

c)

450'C, 200 atm, Iron Catalyst

d)

-450'C, 250 atm, Iron Catalyst

29.

What is the Haber Process?

a)

The production of ammonia by combining nitrogen and hydrogen gases

b)

The production of nitrogen by combining hydrogen and ammonia gasses

c)

The production of hydrogen by combining ammonia and nitrogen gasses

d)

The ionization of ammonia

30.

The Contact process is used for the manufacture of...

a)

Sulphur

b)

Sulphur dioxide

c)

Sulphur trioxide

d)

Sulphuric acid

31.

Name the catalyst used in the Contact process.

a)

Finely-divided Iron

b)

Vanadium (V) Oxide

c)

Nickel

d)

Chromium

32.

What are the conditions used in the Contact process?

a)

1 atm1\ atm and 450 °C450\ \degree C

b)

200 atm200\ atm and 450 °C450\ \degree C

c)

450 atm450\ atm and 1 °C1\ \degree C

d)

450 atm450\ atm and 200 °C200\ \degree C

33.

What is H2S2O7?

a)

Concentrated sulfuric acid

b)

Sulfur trioxide

c)

Oleum

d)

Hydrogen sulfate

34.

The enthalpy change of a reaction in the Contact process reads as ΔH=−197\Delta H=-197  kJ/mol. What does this tell us about the reaction?

a)

It is an exothermic reaction

b)

It is an endothermic reaction

c)

It loses 197 grams of reactant

d)

It produces 197 grams of product

35.

What type of reactions can able to change products back to the their original form?

a)

Reversible reactions

b)

Irreversible reactions

c)

Combustion reactions

d)

Combination reactions

36.

Which of the following combination is correct?

a)

reversible ⇌

irreversible →

b)

reversible ←

irreversible →

c)

reversible ⇌

irreversible ←

d)

irreversible ⇌

reversible →

37.

If a reversible reaction is exothermic in the forward direction, it will be ...

a)

exothermic in the reverse direction

b)

endothermic in the forward direction too

c)

endothermic in the reverse direction

d)

not involve energy in reverse direction

38.
Which of these is NOT a reversible change?
a)
Water to Ice
b)
Juice to ice lolly
c)
Cookie Dough to Cookie
d)
Melting Chocolate
39.

A temperature increase causes the particles ......

a)

to slow down

b)

move faster

c)

collide higher

d)

in the right order

40.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
41.
What is the rate of reaction?
a)
How fast a reaction is 
b)
How big a reaction is
c)
How loud a reaction is
d)
How much gas a reaction produces
42.

An _______ change cannot be undone because the change is permanent and generally creates a new substance.

a)

reversible

b)

irreversible

43.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
44.
This symbol indicates that a reaction is ____________
a)
reversible
b)
irreversible
45.
Define chemical equilibrium.
a)
A reaction is reversible.
b)
The concentration of the reactants is equal to the concentration of the products.
c)
The rate of a forward reaction is equal to the rate of the reverse reaction.
d)
The reaction stops and no further change in concentration occurs.
46.
In an endothermic reaction the products have 
a)
more energy than the reactants
b)
less energy than the reactants
c)
the same energy as the reactants
d)
no energy
47.
In an exothermic reaction the products have
a)
more energy than the reactants
b)
the same energy as the reactants
c)
less energy than the reactants
d)
no energy
48.

When the rates of the forward and reverse reactions are equal, the reaction has reached a state of balance called chemical equilibrium.

a)

True

b)

False

49.

When no reactants can be detected, you can say that the reaction has gone to completion, or is irreversible.

a)

True

b)

False

50.
Define chemical equilibrium.
a)
A reaction is reversible.
b)
The concentration of the reactants is equal to the concentration of the products.
c)
The rate of a forward reaction is equal to the rate of the reverse reaction.
d)
The reaction stops and no further change in concentration occurs.
51.
For the reaction...
SO2 + O2  <−>  SO3
If the concentration of SO2 is increased, the equilibrium of the reaction will shift ___________.
a)
left
b)
right
c)
left and right 
d)
neither left nor right
52.
For the reaction...
SO2 + O2 <−>  SO3
If the equilibrium shifts to the right, the concentration of O2 will ___________.
a)
increase
b)
decrease
c)
remain the same
d)
double
53.
For the reaction...
SO2 + O2 <−>  SO3
If the concentration of O2 is decreased, the equilibrium of the reaction will shift ___________.
a)
left
b)
right
c)
left and right
d)
neither left nor right
54.
For the reaction...
N2 (g) +  3 H2 (g) <−> 2 NH3 (g)

If the pressure in the system is increased,  which substance will increase in concentration?
a)
N2
b)
H2
c)
N2 and H2
d)
NH3
55.
For the reaction...
heat  +  N2  +  O2  ↔  2NO
If the heat is added to the chemical system, the equilibrium will shift _______.
a)
left
b)
right
c)
left and right
d)
neither left nor right
56.
For the reaction...
heat  +  N2  +  O2  ↔  2NO
If the heat is removed to the chemical system, the equilibrium will shift _______.
a)
left
b)
right
c)
both left and right
d)
neither left nor right
57.
Consider the following reaction:
2SO2(g) + O2(g) ⇄ 2SO3(g)                      +  197 kJ/mol Which of the following will not shift the equilibrium to the right?
a)
Adding more O2
b)
Adding a catalyst
c)
increasing the pressure
d)
Increasing the temperature
58.
Which of the following is NOT true at equilibrium?
a)
The forward and reverse reactions proceed at the same rate.
b)
The concentrations of reactants and products do not change.
c)
The concentration of the reactants is equal to the concentration of the products.
d)
The forward and reverse reactions continue to occur.
59.
Nitrogen + hydrogen −> ammonia is exothermic .  What will happen if we increase the temperature
a)
The reaction will slow down
b)
There will be no change in ammonia production
c)
More ammonia will be produced
d)
Less ammonia will be produced
60.

One of stages in the production of nitric acid is described by this equation: 2NO(g) + O2(g) = 2NO2(g). it is a reversible reaction. Which one of the following will increase the equilibrium yield of NO2(g)?

a)

Adding a catalyst.

b)

Increasing the concentration of O2(g).

c)

Increasing the concentration of NO2(g).

61.
Which of the two graphs reaches equilibrium?
a)
The left one.
b)
The right one.
c)
Both of them.
d)
Neither.
62.
Changes in pressure will only affect substances that are in the __________ state.
a)
gaseous
b)
liquid
c)
solid
d)
plasma
63.
2A + 3B  <---->  2AB
The forward reaction points towards the __________.
a)
left
b)
right
c)
up
d)
down
64.
2A + 3B  <---->  2AB
The forward reaction forms the substance __________.
a)
A
b)
B
c)
AB
d)
A + B
65.
2A + 3B  <---->  2AB
The reverse reaction forms the substance __________.
a)
A
b)
B
c)
AB
d)
A + B
66.
For the reaction...
N2 (g) +  3 H2 (g) <−> 2 NH3 (g)

If the pressure in the system is decreased,  which substance will increase in concentration?
a)
N2
b)
H2
c)
N2 and H2
d)
NH3
67.

What is the name of group number 1?

a)

halogens

b)

noble gases

c)

alkali metals

d)

alkaline earth metals

68.

What is the name of group number 2?

a)

transition metals

b)

halogens

c)

metaloids

d)

alkaline earth metals

69.

where are the metaloids found

a)

far left, vertical

b)

stair step/diagonal

c)

far right horizontal

d)

at the bottom

70.

What group number are the halogens found?

a)

18 (8A)

b)

1

c)

2

d)

17 (7A)

71.

Periodic law states that the elements are arranged according to their atomic ________ so that elements with similar chemical properties are in the same ________ and properties repeat periodically.

a)

numbers, rows

b)

masses, rows

c)

masses, column

d)

numbers, column

72.

A grouping of elements based on similar chemical properties, arranged by columns in the periodic table; also known as a group

a)

family

b)

period

c)

row

d)

isotope

73.

A row on the Periodic Table of Elements

a)

family

b)

period

c)

row

d)

isotope

74.
___________ is the only metal that is a liquid at room temperature.
a)
Platinum
b)
Water
c)
Tin
d)
Mercury
75.
__________ would have some characteristics of metals and some characteristics of nonmetals.
a)
Gold
b)
Sodium
c)
Arsenic
d)
Bismuth
76.

Metals (select all that apply)

a)

are found on the right side of the periodic table.

b)

are found on the left side of the periodic table.

c)

are good conductors of heat and electricity.

d)

are brittle.

e)

are malleable and ductile.

77.

Nonmetals (select all that apply)

a)

are found on the right side of the periodic table.

b)

are found on the left side of the periodic table.

c)

are good conductors of heat and electricity.

d)

are brittle.

e)

can be solid, liquids, or gases at room temperature.

78.

Which element is found in group 2, period 6?

a)

Oxygen (O)

b)

Barium (Ba)

c)

Selenium (Se)

d)

Carbon (C)

79.

Which halogen is found in period 4?

a)

Krypton (Kr)

b)

Xenon (Xe)

c)

Bromine (Br)

d)

Iodine (I)

80.

Which element has similar chemical properties as sodium but has 7 energy levels?

a)

Francium (Fr)

b)

Cesium (Cs)

c)

Rubidium (Rb)

d)

Potassium (K)

81.

Elements that have the same number of energy levels are said to be in the same ______.

a)

group

b)

period

c)

family

d)

classification

82.

The elements in group 7 have similar chemical reactions because they have the same number of...?

a)

electrons

b)

electron shells

c)

outer electrons

d)

protons

83.

Astatine (At) has an atomic number of 85 and is the fifth element in Group 7.


It is possible to make predictions about astatine by comparison with the other elements in Group 7.

How many electrons does an atom of astatine have in its outer shell? (1)

a)

3

b)

6

c)

1

d)

7

84.

As you move left to right on a row or period what happens?

a)

Atomic number increases by 1

b)

Electrons decrease

c)

Number of shells decrease

d)

Nothing

85.

What happens to the number of shells as you move down a group?

a)

They decrease by 1

b)

They increase by 1

c)

Nothing

86.

The first energy shell can hold ______ electrons.

a)

2

b)

8

c)

18

87.

All elements in the same row have the same number of shells.

a)

True

b)

False

c)

Sometimes

88.

Valence means......

a)

inside

b)

outside

c)

full

89.

Elements in the same group or column have the same ...

a)

# of valence electrons

b)

# of shells

c)

# of protons

d)

Mass Number

90.

Elements in the same group have __________

a)

Similar Properties

b)

Same number of shells

c)

Similar Mass

91.

What do all elements in the same period have?

a)

same number of shells

b)

same number of electrons

c)

belong in the same family

92.
a)
Same group
b)
Same period
93.
a)
Group 1
b)
Group 17
c)
Group 2
d)
Group 18
94.
a)
Group 1
b)
Group 17
c)
Group 18
d)
Group 2
95.
a)
Group 1
b)
Group 17
c)
Group 18
d)
Group 2
96.
a)
Metals
b)
Nonmetals
c)
Metalloids
97.
a)
Metals
b)
Nonmetals
c)
Metalloids
98.
a)
Metals
b)
Nonmetals
c)
Metalloids
99.
a)
Metals
b)
Nonmetals
c)
Metalloids
100.
a)
Metals
b)
Nonmetals
c)
Metalloids
101.
a)
Metals
b)
Nonmetals
c)
Metalloids
102.
a)
Metals
b)
Nonmetals
c)
Metalloids
103.
What does the 6 represent?
a)
atomic mass
b)
atomic number
c)
element name
d)
chemical symbol 
104.
What does 12.011 represent?
a)
atomic mass
b)
atomic number
c)
element name
d)
chemical symbol 
105.
These are found on the Periodic Table.
a)
Compounds
b)
Elements
c)
Mixtures
106.

the basic structural unit of matter

a)

atom

b)

matter

c)

element

d)

nucleus

107.

a collection of atoms of one type that cannot be broken down into simpler substances by ordinary chemical or physical means

a)

element

b)

subatomic particle

c)

electron

d)

matter

108.

the positively charged subatomic particle contained in the nucleus of an atom

a)

proton

b)

neutron

c)

electron

d)

matter

109.

a subatomic particle, contained in the nucleus of an atom, having the same mass as a proton but no electrical charge

a)

proton

b)

neutron

c)

electron

d)

matter

110.

a negatively charged subatomic particle that orbits the nucleus of an atom

a)

proton

b)

neutron

c)

electron

d)

matter

111.

a unique number for each element that equals the number of protons in an atom of that element

a)

element name

b)

element symbol

c)

atomic number

d)

atomic mass

112.

State the symbol of the element that has the atomic number of 12.

(a)  

113.

State the symbol of the element that has a relative atomic mass of 12.

(a)  

114.

State the number of group that contains the noble gases?

(a)  

115.

what is the colour of chlorine at room temperature? (1)

a)

black

b)

blue

c)

green

d)

orange

116.

The elements in group 7 have similar chemical reactions because they have the same number of...?

a)

electrons

b)

electron shells

c)

outer electrons

d)

protons

117.

What physical state would you expect for astatine at 20 °C? (1)

(a)  

118.
a)
Group 1
b)
Group 17
c)
Group 18
d)
Group 2
119.
a)
Group 1
b)
Group 17
c)
Group 2
d)
Group 18
120.

choose the wrong statement

a)

Na is more active than Li

b)

O is more active than S

c)

Mg is more active than Al

d)

Cl is more active than F

121.
What is the symbol equation for the reaction between sodium hydroxide and water?
a)
2Na + 2H2O → 2NaOH + H2
b)
Na + H2O → NaOH + H
c)
Na + H20 → NaCl + CO2
d)
2Na + 2H2O → 2NaH2 + O2
122.

Select the statements that are true of basic oxides.

a)

They are oxides of metals.

b)

They dissolve in water to form acids.

c)

They react with acids to form salt and water.

d)

They react with bases to form salts and water.

123.

Carbon monoxide, water and nitrogen monoxide are examples of (a)   oxides.

124.

Select the amphoteric oxides.

a)

aluminium oxide

b)

carbon dioxide

c)

potassium oxide

d)

zinc oxide

125.

When in solution, metal oxides give a pH of .....

a)

0-6

b)

7

c)

3-9

d)

8-14

126.

What type of oxide is:

Copper (II) Oxide

a)

Amphoteric Oxide

b)

Basic Oxide

c)

Neutral Oxide

d)

Acidic Oxide

127.
How are metal oxides formed?
a)
When metals react with oxide.
b)
When metals react with water.
c)
When metals react with air.
d)
When metals react with oxygen.
128.

What is dynamic equilibrium?

a)

The reaction goes forward

b)

The reaction goes backward

c)

The rate of forward and backward reaction is equal

d)

The equilibrium is dynamite

129.

Which of the following does not affect the position of equilibrium?

a)

Temperature

b)

Pressure

c)

Particle Size

d)

Concentration

130.

How does a catalyst affect the position of the equilibrium?

a)

It does not. It only increases the rate of reaction.

b)

Position of equilibrium will shift to the right.

c)

Position of equilibrium will shift to the left.

d)

The reaction would be slower.

131.

What would be the effect of increasing the temperature to the equilibrium of an exothermic reaction?

a)

equilibrium shifts to the left

b)

equilibrium shifts to the right

c)

no change in position of equilibrium

132.

What would be the effect of increasing the temperature to the equilibrium of an endothermic reaction?

a)

equilibrium shifts to the left

b)

equilibrium shifts to the right

c)

no change in position of equilibrium

133.

What would be the effect of increasing the concentration of the product on the position of the equilibrium?

a)

equilibrium shifts to the left

b)

equilibrium shifts to the right

c)

no change in position of equilibrium

134.

What would be the effect of decreasing the concentration of the reactant on the position of the equilibrium?

a)

equilibrium shifts to the left

b)

equilibrium shifts to the right

c)

no change in position of equilibrium

135.

When pressure is increased, the position of the equilibrium will shift to the side that has...

a)

less number of gaseous molecules

b)

more number of gaseous molecules

136.

3H2 (g) + N2 (g) ⇌ 2NH3 (g) ΔH = −197 kJ/mol

Which of the following factors would shift the equilibrium position to the right? (Choose 2)

a)

increase concentration of nitrogen gas

b)

increase temperature of the equilibrium

c)

increase pressure of the equilibrium

d)

Presence of a catalyst

137.

H2 (g) + I2 (g) ⇌ 2HI (g)

What would be the effect of increasing the pressure on the position of equilibrium?

a)

equilibrium shifts to the right

b)

equilibrium shifts to the left

c)

no change in position of equilibrium

138.

In the oxidation reaction

CaO (s) +H2O (l) ↽−−⇀Ca(OH)2 (s) + heat

Lowering the temperature will favor

a)

forward reaction

b)

backward reaction

c)

dynamic equilibrium

d)

all of the above

139.

Why is equilibrium called a dynamic state?

a)

Chemists try to convert as much reactants as possible into products.

b)

The reactions at equilibrium continue to take place once equilibrium is established.

c)

The products of a forward reaction are favored, so equilibrium lies to the right.

d)

All chemical reactions are considered to be reversible under suitable conditions.

140.

At what time (in seconds) is equilibrium established?

a)

0 second

b)

1 second

c)

5 seconds

d)

10 seconds

141.

Le Chaltelier's Principle states that if a chemical system at equilibrium is stressed,

a)

the system will adjust to increase the stress

b)

the system will adjust to reduce the stress

c)

the system will not adjust

142.

An exothermic reaction is allowed to reach equilibrium. If heat energy is then removed, the equilibrium will shift

a)

toward the middle

b)

toward the reactant side

c)

toward the product side

143.

For the reaction...

SO2(g) + O2(g) <−> SO3(g)

If the concentration of SO2(g) is increased, the equilibrium of the reaction will ___________.

a)

shift to the left

b)

shift to the right

c)

no shift

144.

For the reaction...

SO2(g) + O2(g) <−> SO3(g)

If the equilibrium shifts to the right, the concentration of O2(g) will ___________.

a)

increase

b)

decrease

c)

remain the same

145.

When writing an endothermic reaction, heat energy is stated as

a)

product

b)

catalyst

c)

reactant

146.

For the reaction...

N2 (g) + 3 H2 (g) <−> 2 NH3 (g)


If the pressure in the system is increased, the reaction will __________________.

a)

shift to the left

b)

shift to the right

c)

not shift

147.

Such reactions which continue in both directions are called:

a)

Irreversible reactions

b)

Reversible reactions

c)

Non-reactive reactions

d)

dynamic reactions

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