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Physical and Chemical Changes

Total questions: 30

Worksheet time: 19mins

Name
Class
Date
1.
a rusting bicycle
a)
physical change
b)
chemical change
2.
frying an egg
a)
physical change
b)
chemical change
3.

What happens when a piece of wood burns?

a)

A physical change takes place.

b)

A chemical change takes place.

c)

The wood loses its gravity.

d)

The wood becomes a tree again.

4.

Which is NOT an example of condensation?

a)

A bucket of water left uncovered eventually becomes empty.

b)

Dew is found on the grass on a summer morning.

c)

Drops of water form on a cold can of soda on a hot day.

d)

The walls of a bathroom are damp after someone takes a shower.

5.

__________ is anything that has mass and takes up space.

a)

Solid

b)

Matter

c)

Density

d)

Gas

6.
Which of the following is NOT a clue that a chemical change has occurred? 
a)
change of state of matter
b)
color change
c)
production of a gas
d)
production of heat
7.
The particles in a _____ are the farthest apart and move the fastest.
a)
gas
b)
solid
c)
banana
d)
liquid
8.

What reaction has the following general formula:

AB --> A + B

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

9.

What reaction has the following general formula:

A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

10.

What type of reaction is the following:
 2H2+O2−>2H2O2H_2+O_2->2H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

11.

What type of reaction is the following:
 BaCl2+2KI −> 2KCl + BaI2BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

12.

What type of reaction is the following:
 2NaHCO3−> Na2CO3+CO2+H2O2NaHCO_3->\ Na_2CO_3+CO_2+H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

13.
Combining substances to form a new substance
a)
Displacement
b)
Synthesis
c)
Decomposition
d)
Oxidation
14.
Which of the following is an example of a physical change to matter?
a)
rusting
b)
digestion
c)
freezing
15.
Pb(NO3)2 --> PbO + NO2 + O2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
16.
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
17.
Which of the following is not a physical change?
a)
Boiling of water to give water vapour
b)
Melting of ice to give water
c)
Dissolution of salt in water
d)
Combustion of Liquefied Petroleum Gas (LPG)
18.
Which among the following is(are) double displacement reaction(s)?(i) Pb + CuCl2 → PbCl2 + Cu (ii) Na2SO4 + BaCl2 → BaSO4 + 2NaCl (iii) C + O2 → CO2 (iv) CH4 + 2O2 → CO2 + 2H2O
a)
(i) and (iv)
b)
(ii) only
c)
(i) and (ii)
d)
(iii) and (iv)
19.
Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to(i) the formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride(iii) decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride
a)
(a) (i) only
b)
(i) and (iii)
c)
(c) (ii) and (iii)
d)
(d) (iv) only
20.
Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?(i) Displacement reaction (ii) Precipitation reaction (iii) Combination reaction (iv) Double displacement reaction
a)
(a) (i) only
b)
(b) (ii) only
c)
(c) (iv) only
d)
(d) (ii) and (iv)
21.
Which of the following are combination reactions?(i) 2KClO3⎯Heat⎯→ 2KCl + 3O2 (ii) MgO + H2O ⎯→ Mg(OH)2 (iii) 4Al + 3O2 ⎯→ 2Al2 O3 (iv) Zn + FeSO4 → ZnSO4 + Fe
a)
(a) (i) and (iii)
b)
(b) (iii) and (iv)
c)
(c) (ii) and (iv)
d)
(d) (ii) and (iii)
22.

Colour of which metal changes to greem due to corrosion?

a)

Cu

b)

Al

c)

Fe

d)

Ag

23.
What is the ratio of iron atoms to oxygen atoms in the compound for rust (Fe2O3)?
a)
2:3
b)
3:2
c)
1:1
d)
not able to be determined
24.
Iron rust in the presence of:
a)
Vacuum
b)
Moisture
c)
Oxygen
d)
Moisture and Oxygen
25.

What is the chemical nature of rust?

a)

iron (II) oxide

b)

hydrated iron (II) oxide

c)

iron (III) oxide

d)

hydrated iron(III) oxide

26.

The property of metals by which they can be beaten in to thin sheets is called

a)

Sonority

b)

Malleability

c)

Ductility

d)

None of the above

27.

The property of metals by which it can be drawn into wires is

a)

Malleability

b)

Sonority

c)

Lustrous

d)

Ductility

28.

Sodium is very reactive

a)

Non-metal

b)

Liquid metal

c)

Metal

d)

Metalloid

29.
The air around was is  a mixture of gases.
a)
True
b)
False
30.
___________________ this state of matter has a definite shape and definite volume. 
a)
solid
b)
liquid
c)
gas
d)
matter

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