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Chemical Reactions and Chemical Changes

Total questions: 25

Worksheet time: 29mins

Name
Class
Date
1.

Which of the following are the examples of synthesis? Select all that apply.

a)

Na + Br2 → NaBr

b)

KClO3 → KCl + O2

c)

HgO + Cl2 → HgCl + O2

d)

Cl2 + NaBr → NaCl + Br2

e)

Ca + I2 → CaI2

2.

Predict the product:

Mg + N2 → ?

a)

Mg3N2

b)

MgN

c)

Mg2N3

d)

MgN2

e)

Mg2N

3.
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
4.

Choose the balanced chemical equation for the formation of iron oxide when iron is left exposed to moist air.

a)

2Fe + O2 → 2FeO

b)

3Fe + 2O2 → Fe3O4

c)

4Fe + 3O2 → 2Fe2O3

d)

4Fe + O2 → 2FeO2

5.
What type of chemical reaction is this?
Al(OH)3 → Al2O3  + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
6.

Copper (II) carbonate → ___________ + carbon dioxide

a)

copper (I) oxide

b)

copper (II) oxide

c)

copper

d)

None of the above

7.

Metal hydroxide (+ heat) → ____________ + _________

a)

metal carbonate + water

b)

metal oxide + carbon dioxide

c)

carbon dioxide + water

d)

metal oxide + water

8.
A substance that speeds up a chemical reaction without being permanently changed itself is a(n) ____.
a)
catalyst
b)
coefficient
c)
inhibitor
d)
reactant
9.

A nitrate which on decomposition does not release reddish brown gas.

a)

Calcium nitrate

b)

Cupric nitrate

c)

Magnesium nitrate

d)

Potassium nitrate

10.

A nitrate which on decomposition does not leave any residue.

a)

Ammonium Nitrate

b)

Sodium nitrate

c)

Zinc nitrate

d)

Silver nitrate

11.

A compound which on decomposition produces a basic and an acidic gas.

a)

Phosphorus pentachloride

b)

Ammonium chloride

c)

Potassium chlorate

d)

Aluminium chloride

12.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
13.

Balancing the following:

____ Al + ____ HCl → ____ AlCl3 + ____ H2

a)
1,3,1,2
b)
2,3,2,3
c)
2,6,2,3
d)
3,2,6,2
14.

What is the general reaction scheme for a single replacement reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

CxHy+O2 −> CO2+H2OC_xH_y+O_2\ ->\ CO_2+H_2O

15.

Photosynthesis is a chemical reaction that involves the production of glucose (sugar) from carbon dioxide and water in the presence of sunlight. Photosynthesis is what kind of reaction?

a)

Exothermic

b)

Endothermic

c)

Decomposition

d)

Direct Combination

16.
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
17.

Which type of reaction is this:

2AgNO3 ---> 2Ag + 2NO2 + O2

a)

Electrochemical Reaction

b)

Catalytic Reaction

c)

Photochemical Reaction

d)

Thermal Dissociation

18.

A carbonate which does not decompose on heating.

a)

Potassium carbonate

b)

Magnesium carbonate

c)

Calcium carbonate

d)

Zinc carbonate

19.

What would be the colour of the resulting solution, when iron reacts with blue coloured copper sulphate solution?

a)

Red

b)

Green

c)

Blue

d)

White

20.

The acid anhydride of sulphuric acid.

a)

SO3

b)

SO2

c)

CO2

d)

NO2

21.

The metal hydroxide which on decomposition forms a metal oxide which is yellow when hot and white when cold.

a)

Ca(OH)2

b)

Cu(OH)2

c)

Pb(OH)2

d)

Zn(OH)2

22.

Identify which type of reaction is this:

BaCl2 + Na2SO4 ----> BaSO4 + 2NaCl

a)

Neutralisation Reaction

b)

Precipitation Reaction

c)

Decomposition Reaction

d)

Displacement Reaction

23.

The gas which liberates when zinc reacts with dilute hydrochloric acid.

a)

Sulphur dioxide

b)

Carbon dioxide

c)

Hydrogen

d)

Hydrogen sulphide

24.

Which of the following are exothermic processes?

(i) Reaction of water with quick lime

(ii) Combustion of Methane gas

(iii) Evaporation of water

(iv) Sublimation of camphor (crystals)

a)

(i) and (ii)

b)

(ii) and (iii)

c)

(i) and (iv)

d)

(ii) and (iv)

25.

2HNO3 + Ca(OH)2 → Ca(NO3)2 + 2H2O; is an example of

(i) displacement reaction

(ii) double displacement reaction

(iii) neutralisation reaction

(iv) combination reaction.

a)

(i) and (ii)

b)

(ii) and (iii)

c)

(iii) and (iv)

d)

(i) and (iv)

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