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DN_ELEMENTS & COMPOUNDS

Total questions: 70

Worksheet time: 1hrs 10mins

Name
Class
Date
1.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
2.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
3.
Salt water boils and the water completely evaporates, salt (NaCl) is left in the bottom of the beaker. Which of the following is left in the beaker?
a)
Compound
b)
Element
c)
Mixture
d)
None of the Above
4.
What cannot be broken down into other substances?
a)
Compound
b)
Mixture
c)
Solids
d)
Element
5.

Which of the following is

an element?

a)
Carbonic Acid
b)
Copper
c)
Iron and Copper
d)
Water
6.
How many elements are represented in the compound?
Na2CO3
a)
1
b)
2
c)
3
d)
4
7.
When the nails were left outside and allowed to rust during the substance detector activity, what new substance was created?
a)
Mud
b)
Rust
c)
Grass
d)
Water
8.
Is water an element or a compound?
a)
Element
b)
Compound
9.

Au is the symbol of which element?

a)
Iron
b)
Titanium
c)
Gold
d)
Flourine
10.
Element:Fe
a)
Gold
b)
Flourine
c)
Phosphorus
d)
Iron
11.

What is the symbol for Calcium?

a)
Cl
b)
Ca
c)
Cm
d)
ca
12.
Element is a
a)
pure substance
b)
compound
c)
mixture
d)
molecule
13.
How many elements are in HHe
a)
3
b)
4
c)
2
d)
5
14.
What does the element AI stand for ?
a)
Gold
b)
Actinium
c)
Iron
d)
Aluminum
15.

The symbol of SULFUR is ………………….

a)
Su
b)
S
c)
Sf
d)
Si
16.

Which of the following cannot be found in the periodic table?

a)
Compound 
b)
Element
17.

Can elements be broken down further by physical or chemical changes?

a)

No

b)

Yes

18.

H2O

How many types of elements are in this compound?

a)

1

b)

2

c)

3

d)

4

19.

Water ( H2O) is a compound because-

a)

it is made of two different elements

b)

useful to humans

c)

a gas at room temperature

d)

given off by plants

20.

Carbon (C) is considered an element while Carbon Dioxide (CO2) is considered a compound. That is because Carbon Dioxide is -

a)

a gas

b)

made of two elements

c)

given off by plants

d)

useful to us

21.

How many capital or uppercase letters can be there in the symbol of the element ?

a)

5

b)

1

c)

3

d)

2

22.

How many elements are in this compound?

B6Cl2OH

a)

4

b)

3

c)

2

d)

1

23.

Which model represents an element as a gas?

a)
b)
c)
d)
24.

Which of the following is/are MONOATOMIC?

a)

METALS

b)

METALLOIDS

c)

INERT GASES

d)

All of these

25.

Non-metallic elements are usually ______.

a)

monoatomic

b)

diatomic

c)

triatomic

d)

polyatomic

26.

IODINE is ______.

a)

monoatomic

b)

diatomic

c)

triatomic

d)

polyatomic

27.

SULPHUR is ______.

a)

monoatomic

b)

diatomic

c)

triatomic

d)

polyatomic

28.

How many atoms are there in 1 molecule of SULPHUR ?

a)

2

b)

4

c)

8

d)

6

29.

How many atoms are there in 1 molecule of PHOSPHORUS ?

a)

2

b)

4

c)

8

d)

6

30.

Which of the following metal(s) are used to make jewellery?

a)

Gold

b)

Platinum

c)

Silver

d)

All of these

31.

Which of the following is an ALLOY of COPPER?

a)

Diamond

b)

Brass

c)

Steel

d)

All of these

32.

Which metal(s) are mixed with COPPER?

a)

Zinc

b)

Tin

c)

Bronze

d)

Both A & B

33.

Which is the most useful METAL?

a)

Gold

b)

Silver

c)

Platinum

d)

Iron

34.

Which of the following is used as a GEM?

a)

Silver

b)

Gold

c)

Impure diamond

d)

Pure diamond

35.

Which of the following is used to cut glass ?

a)

Platinum

b)

Gold

c)

Impure diamond

d)

Pure diamond

36.

What is atomicity?

a)

No. of molecules in one atom of an element

b)

No. of electrons in an atom

c)

No. of atoms molecules in one molecule of an element

d)

None of these

37.

Who discovered atoms?

a)

Isaac newton

b)

John Dalton

c)

Berzelius

d)

Henry Cavandish

38.

Who used english alphabets to represent elements ?

a)

Isaac newton

b)

John Dalton

c)

Berzelius

d)

Henry Cavandish

39.

C is the symbol of _______.

a)

Calcium

b)

Carbon

c)

Cobalt

d)

Copper

40.

Cuprum is the latin name of ______

a)

cobalt

b)

calcium

c)

copper

d)

chlorine

41.

Select the correct statement.

a)

Ferrum is the latin name of fluorine

b)

The horizontal rows in a periodic table are called GROUPS

c)

Carbon, hydrogen & oxygen are the most common elements in the universe

d)

None of these

42.

Select the INCORRECT statement.

a)

Carbon as a metal in the form of graphite is the only good conductor of electricity

b)

Non-metals are non-sonorous

c)

Sodium is a soft metal

d)

Mercury is a liquid metal

43.

Which of the following have high melting & boiling point(s)?

a)

Diamond

b)

Iodine

c)

Graphite

d)

Both of A & C

44.

Which is the only metal which is a poor conductor of heat & electricity?

a)

Iodine

b)

Tungsten

c)

Carbon

d)

Sodium

45.

Which is the only metal which is NOT malleable?

a)

Sodium

b)

Tungsten

c)

Zinc

d)

Carbon

46.

Which is the only non-metal that is a liquid?

a)

Sodium

b)

Bromine

c)

Tungsten

d)

Iodine

47.

Carbon exists as soft solid in which of the following?

a)

Charcoal

b)

Soot

c)

Graphite

d)

All of these

48.

Which of the following is/are the only non-metals that shine?

a)

Iodine

b)

Bromine

c)

Zinc

d)

Tungsten

49.

Which was the second element to be formed after BIG-BANG?

a)

Hydrogen

b)

Helium

c)

Nitrogen

d)

Carbon

50.

What is the fixed ratio of OXYGEN & HYDROGEN in water?

a)

1:8

b)

8:1

c)

2:1

d)

1:2

51.

Why is SODIUM stored in kerosene oil?

a)

Sodium is soft

b)

Sodium reacts with air & water very fast

c)

Sodium controls burning

d)

Sodium shines more in kerosene

52.

State True/ False.

1. Hydrogen supports burning.

2. Water can be separated by electrolysis.

3. Common salt is Sodium Fluoride.

a)

F, T, T

b)

T, T, F

c)

F, F, F

d)

F, T, F

53.

NO is _______.

a)

Nitrogen dioxide

b)

Nitric oxide

c)

Nitrous Oxide

d)

All of these

54.

What is the formula for lead oxide?

a)

ZnO

b)

LeO

c)

PbO

d)

LO

55.

Which combination of letters could be used as a chemical symbol for an element?

a)

BR

b)

CHl

c)

Dy

d)

FeO

56.

Which of the following is a metalloid?

a)

neon

b)

oxygen

c)

arsenic

d)

sulphur

57.

Which element is used in the filament of electric bulbs?

a)

neon

b)

silicon

c)

boron

d)

tungsten

58.

Which of the following is NOT an inert gas?

a)

radon

b)

xenon

c)

hydrogen

d)

helium

59.

State True/False.

1. Pure substances cannot be broken down by physical or chemical methods.

2. Pure substances can be both homogeneous & heterogeneous.

a)

F, F

b)

T, T

c)

F, T

d)

T, F

60.

Which is the first element in the periodic table?

a)

hydrogen

b)

helium

c)

sodium

d)

boron

61.

Polonium is a …………………

a)

metal

b)

non-metal

c)

metalloid

d)

noble gas

62.

State True/False.

There are 92 natural elements in the periodic table.

There are 93 metals out of all elements.

a)

T, T

b)

F, T

c)

T, F

d)

F, F

63.

All metals are usually hard except ………………

a)

zinc

b)

tungsten

c)

sodium

d)

iodine

64.

……………. metal exists as the only metal in liquid form.

a)

bromine

b)

sulphur

c)

iodine

d)

none of these

65.

All metals are malleable & ductile except …………………

a)

gold

b)

zinc

c)

sodium

d)

iodine

66.

The number of atoms in one molecule of an element is known as ……………………

a)

atomic number

b)

atomicity

c)

atomic mass

d)

valency

67.

……………… is a greenish yellowish gas.

a)

hydrogen

b)

helium

c)

chlorine

d)

fluorine

68.

The symbol of chlorine is ……………….

a)

Ch

b)

cl

c)

ch

d)

Cl

69.

Mixtures are …………………….

a)

impure substances

b)

homogeneous

c)

heterogeneous

d)

both A & C

70.

State True/False.

1. All elements can be depicted by chemical formulae.

2. Symbols tell us about the composition of the compounds.

3. Sulphur is a soft metal.

4. Mercury is a liquid non-metal.

a)

F, F, F, F

b)

T, F, F, T

c)

F, T, F, T

d)

T, T, T, T

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