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language of chemistry and transformation of substances

Total questions: 50

Worksheet time: 30mins

Name
Class
Date
1.

Short hand representation for the atom of a specific element

a)

element

b)

atom

c)

symbol

2.

Symbol of copper is

a)

Co

b)

Cu

c)

Ca

3.

The valency of Chlorine in AlCl3 is

a)

1

b)

3

c)

2

4.

Sulphur shows valencies

a)

2

b)

4

c)

both

5.

The molecular formula for Ammonium carbonate is

a)

(NH4 )2CO3

b)

(NH4 )CO3

c)

(NH4 )2CO

6.

Name the elements present in Ammonia

a)

nitrogen

b)

hydrogen

c)

both nitrogen and hydrogen

7.

Most suitable element and most widely accepted standard unit for the measurement of atomic mass

a)

Oxygen

b)

Carbon

c)

Nitrogen

8.

The molecular formula for Nitric acid

a)

HNO3

b)

HNO2

c)

HNO

9.

Molecular formula for the oxide of calcium is

a)

CaO

b)

Ca2O

c)

none

10.

The symbol and valency of ammonium is

a)

NH4 , valency is 1

b)

NH3, valency is 1

c)

NH3 , valency is 2

11.

How are grain seeds removed from their stalks?

a)

Sieving

b)

Winnowing

c)

Threshing

d)

All of the above

12.

What is a mixture?

a)

A chemical combination of two or more different substances.

b)

A physical combination of two or more different substances.

c)

A chemically pure substance.

d)

A special type of solution

13.

When the solute dissolves into a solvent and disappears it is called a _____________.

a)

MIxture

b)

Solution

c)

Solvent

d)

None of the above

14.

Pure substances are made up of the same kind of atoms.

a)

True

b)

False

15.

Which of the following is not a homogeneous mixture?

a)

Oxygen in water

b)

Tea

c)

Sugar and water

d)

Fried rice

16.

Lemonade is a special mixture called a

a)

substance

b)

solution

c)

plasma

d)

ingredient

17.

A fruit salad is a

a)

solution

b)

mixture

18.

Which of the following is essential to perform winnowing activity?

a)

Wind

b)

Water

c)

Magnet

d)

Filter paper

19.

While preparing chapatis, Nitya found that the flour to be used was mixed with wheat grains. Which out of the following is the most suitable method to separate the grains from the flour?

a)

Threshing

b)

Sieving

c)

Winnowing

d)

Filtration

20.

Hand picking method is effective in

a)

solid mixture

b)

Liquid mixture

c)

Gaseous mixture

d)

None of these

21.

What is the valency of lead ?

a)

1,2

b)

5,7

c)

2,4

d)

1,4

22.

True or False: Law of conservation of energy states that matter can neither be created nor destroyed

a)

True

b)

False

23.

The valency of Chlorine in AlCl3 is

a)

1

b)

3

c)

2

24.

The molecular formula for Ammonium carbonate is

a)

(NH4 )2CO3

b)

(NH4 )CO3

c)

(NH4 )2CO

25.

What is the name of 13th element

(a)  

26.

Formula of baking soda

a)

NaHCO3

b)

Nacl

c)

H2SO4

27.

How many valence electrons are in an atom of Ar?

a)

2

b)

8

c)

4

d)

1

28.
valency of chloride ion is
a)
0
b)
+1
c)
-1
d)
2
29.

What is the molecular formula of acetic acid

(a)  

30.

sugar formula ?

a)

K2CO3

b)

Na3PO4

c)

C12H22O11

31.
What is the mass number defined as?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
32.
What is the atomic number of this atom?
a)
1
b)
3
c)
4
d)
7
33.

What is the mass number of this atom?

a)

1

b)

3

c)

4

d)

7

34.

Which subatomic particle has a negative charge in the atom?

a)

proton

b)

neutron

c)

electron

d)

quark

35.
nitrate ion contains 
a)
nitrogen and oxygen
b)
Nitrogen only
c)
Nitrogen ,hydrogen and oxygen
d)
Sodium and nitrogen
36.

The process of settling down of particles of a solid in a liquid is

a)

Sublimation

b)

Sedimentation

c)

Filtration

d)

Decantation

37.

While preparing chapatis, Priti found that the flour to be used was mixed with wheat grains. Which out of the following is the most suitable method to separate the grains from the flour?

a)

Threshing

b)

Sieving

c)

Winnowing

d)

Filtration

38.

What is the process that is used to separate grains from stalks called?

a)

handpicking

b)

threshing

c)

sieving

d)

winnowing

39.

What separation technique does the picture show?

a)

Sieving

b)

filtering

c)

magnetic separation

d)

Distillation

40.
The drops of water that appear on the outside of a glass of cold water on a warm day are an example of?
a)
sublimation
b)
condensation
c)
evaporation
41.
Iron and copper screws could be separated using a magnet because
a)
iron is magnetic, copper is not
b)
copper is magnetic, iron is not
c)
neither metal is magnetic
d)
copper screws are heavier than iron and fall off the magnet
42.

What is the purpose of Filtration?

a)

Separating and insoluble solid from a liquid

b)

Separation of a mixture of 2 solids

c)

Separates heavier substances from a suspension

43.

Which of the following is essential to perform winnowing activity?

a)

Wind

b)

Water

c)

Magnet

d)

Filter paper

44.

The process of changing solid to gas directly is ______

a)

Evaporation

b)

Condensation

c)

Melting

d)

Sublimation

45.
Statement A: A mixture of cement and pebbles can be separated by using the sieve with small pores Statement B: A sieve with small pores will allow only small cement particles to pass through and will hold back the pebbles
a)
a. Statement A is true only
b)
b. Statement B is true only
c)
c. Both are false
d)
d. Both are true
46.

You might have observed the preparation butter from cream at home. Which method(s) can be used to separate butter from the residue?

a)

evaporation

b)

centrifugation

c)

filtration

d)

sedimentation and decantation

47.

Sawdust is not soluble in water. If, accidentally some particles of sawdust drop into a glass of water. How would you separate them from water?

a)

Decanting

b)

Filtering

c)

Sieving

d)

Distillation

48.

A ______________ mixture is one that does not have a uniform composition.

a)

heterogeneous

b)

homogenous

c)

pure substance

49.

A material that allows liquids to pass through it, while very small solids remain behind as residue

a)

Filter

b)

Sieve

c)

Funnel

d)

Spoon

50.
Which of the following is a method of separating solutions?
a)
hand seperation
b)
filtering
c)
screening
d)
evaporation 

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