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Worksheets

Chemical Reactions grade 8

Total questions: 150

Worksheet time: 3hrs 17mins

Name
Class
Date
1.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
2.

You know that a chemical reaction has occurred if

a)

there is a precipitate (new solid)

b)

there is a color change.

c)

there is a temperature change.

d)

All of these answers are evidence.

3.

1. How is a chemical change different from a physical change?

a)

there is no difference

b)

a physical change creates a new substance

c)

a chemical change creates a new substance

4.

A chemical change is different than a physical change because in a chemical change

a)

chemicals are used

b)

molecules do not physically touch

c)

a new substance is formed and in a physical no new substance is formed

d)

the change can be seen but in a physical change it cannot

5.

A solid that is deposited from a solution

a)

Solid

b)

Liquid

c)

Product

d)

Precipitate

6.

A substance produced during a chemical reaction

a)

Product

b)

Reactant

c)

Properties

7.

A substance that takes part in and undergoes change during a reaction

a)

Product

b)

Molecule

c)

Reactant

8.

A chemical reaction or process that absorbs heat from the surroundings

a)

Endothermic

b)

Exothermic

9.

A chemical reaction or process that releases heat.

a)

Endothermic

b)

Exothermic

10.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
11.
What type of reaction is illustrated below?
2HI --> H2  +  I2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
12.

What does the "thermal" in thermal decomposition mean?

a)

sulfur

b)

catalyst

c)

heat

d)

oven

13.

NaHCO3 decomposes when heated to give _____ _____, carbon dioxide and water

a)

sodium oxide

b)

sodium carbonide

c)

sodium carbonate

d)

water and carbon dioxide

14.

______________ (+ heat) → zinc oxide + carbon dioxide

a)

zinc carbonate

b)

zinc oxide

c)

zinc dioxide

d)

zinc hydrogen carbonate

15.

Why does thermal decomposition need heat energy

a)

to make magic

b)

to break bonds

c)

to make water

d)

to work as a catalyst

16.
A decomposition reaction can be represented as _____________________.
a)
AB  → A + B
b)
A + B → AB
c)
AB + CD → AC + BD
d)
A + BC → B + AC
17.
A chemical change in which a single compound breaks down into two or more simpler products is called a ______________________.
a)
single-replacement reaction
b)
synthesis reaction
c)
double-replacement reaction
d)
decomposition reaction
18.
This chemical equation for mercury oxide is an example of what type of reaction?
2HgO  → 2Hg + O2
a)
decomposition reaction
b)
synthesis reaction
c)
combustion reaction
d)
Marvin the Martian reaction
19.
A chemical change in which two or more substances react to form a new substance is a ____________________________.
a)
decomposition reaction
b)
synthesis reaction
c)
double displacement reaction
d)
combustion reaction
20.
A synthesis reaction can be represented as ________________________.
a)
AB + CD → AC + BD
b)
AB → A + B
c)
A + B → AB
d)
A + BC → B + AC
21.
This chemical equation for magnesium oxide is an example of what type of reaction?
2Mg + O2  → 2MgO
a)
decomposition reaction
b)
synthesis reaction
c)
single displacement reaction
d)
combustion reaction
22.
Which of the following is an example of synthesis?
a)
Na + Br2 --> NaBr
b)
KClO3 --> KCl + O2
c)
HgO + Cl2-->HgCl + O2
d)
Cl2 + NaBr --> NaCl + Br2
23.

A substance that speeds up chemical reactions

a)

activation energy

b)

catalyst

c)

precipitate

d)

chemical reaction

24.

Which type of chemical reaction is this:

FeCl2 + K2S --------- FeS + 2KCl

a)

synthesis

b)

double replacement

c)

combustion

d)

single replacement

25.

Identify the following chemical reaction.

2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

26.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

27.

What reaction has the following general formula:

A + B --> AB

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

28.

Combustion reactions will always involve

a)

Oxygen and a solid

b)

Liquid nitrogen and heat

c)

Oxygen and heat/energy

d)

CO and H2O

29.

In which type of reaction do ions in two compounds switch places?

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

30.

Photosynthesis is an _____ reaction.

a)

EXOthermic

b)

ENDOthermic

31.
An enzyme increases the rate of a reaction.
a)
True
b)
False
32.

H2(g) + 2AgCl(aq) ---> 2Ag(s) + 2HCl(aq)

The redox reaction above can also be classified as _____.

a)

synthesis

b)

single replacement

c)

combustion

d)

double replacement

33.

The reaction shown can be classified as _____.

a)

decomposition

b)

synthesis

c)

single replacement

d)

double replacement

34.

What type of reaction does this image represent?

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

35.

What type of reaction involves the breaking down of a substance into simpler substances?

a)

Single Replacement Reaction

b)

Double Replacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

36.

 

Predict the products if Calcium Carbonate reacts with Silver Sulfate.

CaCO3 + Ag2SO4 → ?

a)

Ag2CO3 + Ca2SO4

b)

AgCO3 + CaSO4

c)

CaSO4 + Ag2CO3

d)

Ag(CO3)2 + CaSO4

37.

What are the products of this reaction? Cu+ AgNO3--> 

a)

Cu(NO3)2+Ag

b)

CuNO3 + Ag

c)

CuAg+NO3

d)

Cu+ AgNO3

38.

Which of the following represents a double displacement reaction?

a)

ABC → AB + C

b)

A + B → AB

c)

AB + CD → AD + CB

d)

A + BC → AC + B

39.

Complete the following reaction:

Hydrochloric acid + magnesium hydroxide -->

a)

Magnesium chloride + water

b)

Magnesium + water

c)

Magnesium chloride + hydrogen

d)

Magnesium chloride + water + carbon dioxide

40.

The following are the evidences that chemical reaction took place, EXCEPT:

a)

evolution of gas

b)

formation of precipitate

c)

formation of new element

d)

change in the intrinsic properties

41.

Which of the following best describes the combustion reaction?

a)

hydrocarbon combines with oxygen to produce CO2 and H2O

b)

hydrogen combines with CO2 to produce O2 and H2O

c)

hydrocarbon combines with H2O to produce CO2 and O2

d)

CO2 combines with oxygen to produce hydroxide and H2O

42.

Quicklime ( CaO ) is used as a drying agent. When water is added to this, slaked lime Ca(OH)2 is formed. What type of reaction is this?

a)

combination

b)

single displacement

c)

decomposition

d)

double displacement

43.

Which of the following chemical reaction shows the production of water from hydrogen gas and oxygen gas?

a)

2 H2O → 2 H2 + O2

b)

2 H2 + O2 → 2 H2O

c)

3 H2 + O2 → 3 H2O

d)

3 H2O → H2 + 3 O2

44.
When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?
a)
a change of color
b)
a change of state
c)
a temperature decrease
d)
a temperature increase
45.
What types of reactions absorb and release heat?
a)
acidic and basic
b)
endothermic and exothermic
c)
endothermic and heat transfusion
d)
covalent and ionic
46.
Which is an example of an endothermic reaction?
a)
burning wood
b)
airplane using fuel
c)
plant leaves using photosynthesis
d)
digesting food
47.

Predict the products of this synthesis reaction: H2 + Cl2 →

a)

HCl

b)

H2Cl2

c)

H2Cl

d)

HCl2

48.

Predict the products for the this Single Replacement reaction:

K + HCl →

a)

KCl + H2

b)

KHCl

c)

KH + Cl2

d)

HCl + K2

49.

Predict the products for the this Double Replacement reaction:

AgNO3 + KCl →

a)

AgCl + KNO3

b)

AgK + ClNO3

c)

KAg + NO3Cl

d)

AgCl + 3 KNO

50.

Complete the balanced equation for this Double Replacement reaction.

3 NaOH + Fe(NO3)3 →

a)

NaFe + OH(NO3)3

b)

NaNO3 + Fe(OH)3

c)

3 NaNO3 + Fe(OH)3

d)

3 NaFe + 3 (OH)NO3

51.

Predict the products for the decomposition of aluminum oxide, Al2O3 →

a)

Al + O2

b)

O + Al2

c)

Al2 + O3

d)

Al + O

52.
An acid reacts with metal to produce 
a)
Carbon dioxide 
b)
Hydrogen gas
c)
Hydrogen gas and water 
d)
Salt and hydrogen gas 
53.
A neutralisation reaction produces 
a)
An acid 
b)
A neutral substance 
c)
Only water 
d)
Salt and water 
54.
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 
55.

Which of the following is a neutralization reaction?

a)

2Na + Cl2 → 2NaCl

b)

CH4 + 2O2 → CO2 + 2H2O

c)

HCl + KOH → KCl + H2O

d)

CaCO3 → CO2 + CaO

56.
What type of reaction is the following: 
HCl  + Zn --> ZnCl2 + H2
a)
Neutralisation
b)
Acid and a metal 
c)
Acid and a carbonate 
d)
Ionic 
57.

Complete the following reaction: Sulfuric acid + sodium carbonate --> 

a)
Carbon dioxide + water 
b)
calcium carbonate + water + carbon dioxide 
c)

Sodium sulfate + water + carbon dioxide 

d)
Sodium chloride + water + carbon dioxide 
58.
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 
59.
Acid + Metal --> ?
a)
Salt + Water
b)
Salt + Hydrogen
c)
Salt
d)
Hydrogen
60.
Iron + Hydrochloric acid --> ?
a)
iron sulfate + water
b)
iron + hydrogen
c)
iron chloride + hydrogen
d)
iron chloride + water
61.
Zinc + nitric acid --> ?
a)
zinc sulfate + water
b)
zinc sulfate + hydrogen
c)
zinc nitrate + hydrogen
d)
zinc chloride + water
62.
What gas is produced when a metal reacts with an acid?
a)
Water vapour
b)
Acidic gas
c)
Hydrogen
d)
Nitrogen
63.

A soluble base is called..............

a)

acid

b)

alkali

c)

amphoertic

d)

element

64.

Alkali + ammonium salt --> salt + water + gas X

What is gas X?

a)

ammonia

b)

carbon dioxide

c)

oxygen

d)

hydrogen

65.

sodium hydroxide + ammonium chloride --> salt Z + water + ammonia gas

What is salt Z?

a)

calcium carbonate

b)

sodium chloride

c)

barium sulfate

d)

magensium nitrate

66.

a reaction in which one atom or ion in a compound is replaced by another atom or ion

a)

single-replacement reactions

b)

double-replacement reactions

c)

acid-base reaction

d)

synthesis reaction

67.

a chemical reaction between two compounds where the cations in two compounds switch the anions they are bonded to, resulting in two new compounds

a)

single-replacement reaction

b)

double-replacement reaction

c)

acid-base reaction

d)

synthesis

68.

a reaction in which two or more elements or compounds combine to form a more complex compound

a)

acid-base reaction

b)

neutralization reaction

c)

synthesis reaction

d)

decomposition reaction

69.

a reaction in which a substance reacts with oxygen gas to produce carbon dioxide, water, and heat

a)

acid-base reaction

b)

neutralization reaction

c)

synthesis reaction

d)

combustion reaction

70.
Which type of reaction requires the activity series?
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement and single replacement
71.
True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed. 
a)
true
b)
false
72.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
73.
Balance this equation,            
Al2O3 --> Al + O2 
a)
Cannot be balanced
b)
2Al2O3 --> 2Al+3O2 
c)
2Al2O3--> 4Al+3O2 
d)
3Al2O3--> 2Al+O2 
74.

What type of reaction is this?


2NaHCO3 --> Na2CO3 + H2O + CO2

a)

Single Replacement

b)

Combustion

c)

Decomposition

d)

Synthesis

75.

Which is the name of the kind of solid substance formed in this figure?

a)

aqueous

b)

precipitate

c)

coordinate complex

d)

synthesis

76.

Use the activity series shown to predict which reaction will occur.

a)

NaBr + I2 →

b)

KBr + F2 →

c)

LiF + Cl2 →

d)

NaCl+ I2 →

77.

Iron metal reacts with chlorine gas to produce solid Iron (III) Chloride

a)

2 Fe + 3 Cl2 → 2 FeCl3

b)

3Fe + 2Cl → FeCl

c)

3Fe + Cl → FeCl

d)

3Fe + Cl → FeCl

78.

In this reactivity series, which of the following is the most reactive element?

a)

Gold

b)

Calcium

c)

Zinc

d)

Potassium

79.

In this reactivity series, which of the following is the least reactive element?

a)

Gold

b)

Calcium

c)

Zinc

d)

Potassium

80.

True or False:

Magnesium is more reactive than silver.

a)

True

b)

False

81.

What type of reaction is shown by this word equation?

lead nitrate + sodium → sodium nitrate + lead

a)

Decomposition

b)

Thermite

c)

Displacement

d)

Neutralisation

82.

In a displacement reaction, it is the ____________ reactive metal that is displaced from a compound.

a)

Heaviest

b)

Least

c)

Most

d)

Worst

83.

Use the following observations to select the correct reactivity series (highest to lowest).


calcium + water: slow

sodium + water: fast

calcium + dilute acid: very fast

gold + dilute acid: no reaction

aluminium + dilute acid: fast

a)

calcium, sodium, aluminium, gold

b)

sodium, calcium, aluminium, gold

c)

sodium, aluminium, calcium, gold

d)

gold, aluminium, calcium, sodium

84.

Which of the following is MOST reactive?

a)

Magnesium

b)

Lead

c)

Tin

d)

Copper

e)

Zinc

85.

Which metal is more reactive than calcium?

a)

magnesium

b)

potassium

c)

silver

d)

aluminum

86.

Choose the least reactive metal

a)

calcium

b)

magnesium

c)

iron

d)

copper

87.

Iron nails + copper oxide → ?

a)

Iron nails + copper oxide

b)

Iron oxide + copper oxide

c)

Iron oxide + copper

d)

Magic

88.
Which of the following is arranged according increasing reactivity?
a)
Mg > Li > Na > K
b)
Mg > Na > Li > K
c)
Na > Li > Mg > K
d)
K > Mg > Na > Li
89.
Which one of the following equations correctly represents the reaction of silver nitrate with copper metal?
a)
CuNO3(aq) + Ag(s) → Cu(s) + AgNO3(aq)
b)
Cu(s) + 2 AgNO3(aq) → Cu(NO3)2(aq) + 2 Ag(s)
c)
Cu(s) + AgNO3(aq) → CuNO3(aq) + Ag(s)
d)
Cu(s) + Ag(NO3)2(aq) → Cu(NO3)2(aq) + Ag(s)
90.
If the metal is more reactive than the metal in the compound it completes with the less reactive metal. Therefore, it can concluded that ...
a)
The less reactive metal repel the more reactive metal from its compound
b)
The more reactive metal bonded with  the less reactive metal from its compound
c)
The less reactive metal pushes out or displaces the more reactive metal from its compound
d)
The more reactive metal pushes out or displaces the less reactive metal from its compound
91.
What will be reaction if less reactive metal is added in a solution with more reactive metal compound?
a)
vigorous reaction
b)
fizzing gas produced
c)
burns moderately
d)
no reaction
92.
Which of the following will not undergo reaction?
a)
zinc metal  +  zinc oxide 
b)
iron metal  +  copper oxide
c)
zinc metal +  iron oxide
d)
magnesium  +  iron oxide
93.

Alkali metal + Water —> _____________ + ____________

a)

metal hydroxide and oxygen gas

b)

metal hydroxide and hydrogen gas

c)

metal oxide and oxygen gas

d)

metal oxide and hydrogen gas

94.

Which of the following does not react with water?

a)

Copper

b)

Lithium

c)

Sodium

d)

Potassium

95.

Which of the following metals is the most reactive in dilute sulfuric acid?

a)

Magnesium

b)

Lead

c)

Zinc

d)

Potassium

96.

Which one of the following metals reacts slowly with cold water?

a)

Lithium

b)

Copper

c)

Silver

d)

Calcium

97.

Aluminium carbonate + Sulfuric acid —> _______________ + __________________ + water

a)

Aluminium sulfide + Oxygen

b)

Aluminium sulfate + Hydrogen

c)

Aluminium sulfate + Carbon dioxide

d)

Aluminium sulfide + Carbon dioxide

98.

Which of the following metals does not displace hydrogen gas when reacts with dilute HCl or dilute H2SO4?

a)

Lithium

b)

Sodium

c)

Magnesium

d)

Copper

99.

Arrange these metals in decreasing order of reactivity with dilute hydrochloric acid.

Mg, Fe, Ca, Zn, Cu

a)

Ca > Mg > Zn > Fe > Cu

b)

Ca > Mg > Zn > Fe > Mg

c)

Fe > Mg > Zn > Ca > Mg

d)

Zn > Fe > Mg > Ca > Mg

100.

Which of the following metals sink in the container filled with water and react to form hydrogen gas?

a)

Potassium

b)

Sodium

c)

Lithium

d)

Calcium

101.

What gas is always produced when a metal reacts with water?

a)

Oxygen

b)

Carbon Dioxide

c)

Hydrogen

d)

Carbon Monoxide

102.

What is name of the gas which is produced when metals react with acids?

a)

Hydrogen

b)

Carbon Dioxide

c)

Nitrogen

d)

Oxygen

103.

When copper and magnesium sulphate are mixed together, there is no reaction. Why?

a)

Magnesium is more reactive than copper

b)

Copper is more reactive than magnesium

c)

Copper never reacts with metal salts

d)

Magnesium Sulfate never reacts with metals

104.

Which of the following does not react with water?

a)

Lithium

b)

Magnesium

c)

Lead

d)

Calcium

105.

Which one of the following metals reacts most vigorously with cold water?

a)

Sodium

b)

Magnesium

c)

Copper

d)

Zinc

106.

Oxidation is the _________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

107.

Reduction is the ___________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

108.

In the reaction; 2Ca(s) + O2(g) --> 2CaO(s), calcium is __________

a)

Reduced

b)

Synthesized

c)

Oxidized

d)

None of the above

109.

Which of the following is the correct order of the reactivity series

a)

Li, Na, K, Ca, Al, Mg,C, Z, Fe, H, C, Ag, Au

b)

Al, Mg,C, Z, Fe, H, C, Ag, Au, Li, Na, K, Ca,

c)

K, Na, Li, Ca, Al, Mg,C, Z, Fe, H, C, Ag, Au

110.

Zn(s) + CuO(s) -> ZnO(s) + Cu(s)

The reaction above is Zn oxidised or reduced?

a)

oxidised

b)

reduced

111.
What else is produced when a metal reacts with water? (HINT: Water has the formula H2O)
a)
Metal Oxide
b)
Metal Carbonate
c)
Metal Hydride
d)
Metal Hydroxide
112.
As well as a gas, there is another product made when an acid reacts with a metal. What is the name for this?
a)
Salt
b)
Water
c)
Alkali
d)
Carbon
113.
When potassium reacts with sulphuric acid, what is the name of the salt produced?
a)
Potassium Sulphide
b)
Potassium Sulphur
c)
Potassium Sulphuric
d)
Potassium Sulphate
114.

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

115.

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

116.

Which of the following chemical reactions is reversible?

a)

CH4 + O2 ⇌ CO2 + H2O

b)

CuSO4.5H2O → CuSO4 + 5H2O

c)

NH4Cl ⇌ NH3 + HCl

d)

CaCO3 → CaO +CO2

117.

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

a)

to slow down

b)

move faster

c)

collide higher

d)

in the right order

118.
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
119.

What effect will increased temperature have on this reaction (forward reaction is exothermic)?
N2(g) + 3H2(g)    <-->    2NH3(g)

a)

There will be no effect

b)

The reaction will slow down

c)

More nitrogen and hydrogen will be produced

d)

More ammonia will be produced

120.

The conditions which could be changed and are:

a)

temperature and pressure

b)

temperature, concentration and pressure

c)

reactants and products

121.

Catalyst used for Contact process

a)

Iron, Fe

b)

Vanadium (V) oxide, V2O5

c)

Yeast

d)

Phosphoric acid, H3PO4

e)

Nickel, Ni

122.

Catalyst used for Decomposition of Hydrogen Peroxide, H2O2

a)

Iron, Fe

b)

Vanadium (V) oxide, V2O5

c)

Manganese (IV) oxide, MnO2 / Copper (II) oxide, CuO

d)

Rhodium, Rh / Platinum, Pt / Paladium, Pd

e)

Conc. Sulfuric acid, H2SO4

123.

Which of the following factors would not speed up a chemical reaction?

a)

Increasing the concentration of a reactant

b)

Adding a catalyst

c)

Raising the temperature

d)

Making the particles larger

124.

A substance that speeds up a chemical reaction without undergoing a permanent change is called?

a)

catalyst

b)

reactant

c)

coefficient

d)

inhibitor

125.

The mechanism of enzyme activity is known as

a)

hydrolysis

b)

catalysis

c)

proteolysis

d)

hydration

126.

Adding a catalyst ___________ the activation energy.

a)

Raises

b)

Lowers

c)

Doesn't affect

d)

Inreases

127.

The minimum amount of energy needed for colliding particles to react is called

a)

Chemical Energy

b)

Kinetic Energy

c)

Activation Energy

d)

Potential Energy

128.

Powdered sugar has a greater ______ _____ than a solid cube of

sugar.

a)

Surface Area

b)

Catalyst

c)

Temperature

129.

Does the presence of catalyst will change the amount of product?

a)

Yes

b)

No

130.

How does temperature increase the rate of a chemical reaction?

a)

Provides lower energy route for the reaction so that a greater number of particles have enough energy to react.

b)

Increased number of collisions increases the chance of a 'successful collision'

c)

Particles collide faster and harder so a larger proportion have greater energy than the required activation energy.

d)

Greater number of 'active sites' available for a reaction to take place (referring to solids)

131.
A catalyst increases the efficiency of collisions between reactants.
a)
true
b)
false
132.

What is the name given to a catalyst in the human body?

a)

Biology

b)

Catalyst

c)

Chemical

d)

Enzyme

133.

When a catalyst is added to a reaction the rate of reaction,,,

a)

Increases

b)

Decreases

c)

Does not change

134.
Is respiration an Endothermic or an Exothermic reaction?
a)
Endothermic
b)
Exothermic
135.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
c)
None of these 
136.

The graph above is from which type of reaction?

a)

Endothermic reaction

b)

Exothermic Reaction

137.

What type of oxide is:

Copper (II) Oxide

a)

Amphoteric Oxide

b)

Basic Oxide

c)

Neutral Oxide

d)

Acidic Oxide

138.

What type of oxide is:

Carbon monoxide

a)

Amphoteric Oxide

b)

Basic Oxide

c)

Neutral Oxide

d)

Acidic Oxide

139.

What type of oxide is:

Carbon Dioxide

a)

Amphoteric Oxide

b)

Basic Oxide

c)

Neutral Oxide

d)

Acidic Oxide

140.

Amphoteric oxides are substances that

a)

Reacts with acids only

b)

Reacts with bases only

c)

Reacts with acids and bases

d)

Do not react with acids or bases

141.

ZnO is an oxide that can react with acids and bases, as shown in the following equations:

ZnO + HSO --> ZnSO + H2O

ZnO +2NaOH -->Na2ZnO2 +H2O


What name is given to an oxide that reacts with both acids and bases?

a)

neutral

b)

acidic

c)

precipitate

d)

amphoteric

e)

displacement

142.

Which of the following oxides is most likely to be an acidic oxide?

a)

CuO

b)

Na2O

c)

MgO

d)

SO2

143.

Which of the following oxides is most likely to be an basic oxide?

a)

Al2O3

b)

H2O

c)

MgO

d)

CO2

144.

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.

145.

Select the amphoteric oxides.

a)

aluminium oxide

b)

carbon dioxide

c)

lead(II) oxide

d)

potassium oxide

e)

zinc oxide

146.

What type of oxide is:

Water

a)

Amphoteric Oxide

b)

Basic Oxide

c)

Neutral Oxide

d)

Acidic Oxide

147.

Sulfur trioxide is an acidic oxide with the formula of...

a)

SO

b)

SO2

c)

SO3

d)

S3O

148.
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.
149.

Metal oxides are basic because .....

a)

they form alkaline solutions

b)

they form acidic solutions

c)

they are simple

d)

they are dull

150.

Which type of oxides cannot react with acid or base?

a)

acidic

b)

amphoteric

c)

basic

d)

neutral

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