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Compounds and Chemical Formulae

Total questions: 30

Worksheet time: 25mins

Name
Class
Date
1.
How many atoms of oxygen are there in water? H2O
a)
1
b)
2
c)
0
2.
How many atoms of sulphur are in sulphuric acid? H2SO4
a)
6
b)
2
c)
4
d)
1
3.
How many atoms are there all together in HCl?
a)
1
b)
2
c)
3
4.
What are the different elements in carbon dioxide?
a)
carbon
b)
cobalt and oxygen
c)
oxygen and carbon
d)
oxide and carbon
5.
How many different elements make up nitric acid? HNO3
a)
1
b)
5
c)
3
6.
What elements make up Copper sulphate? CuSO4
a)
copper, sulphate
b)
copper, sulphur
c)
copper, sulphur and oxygen
d)
copper and oxygen
7.
What is the correct chemical formula for water?
a)
H2O
b)
HO2
c)
H2O
d)
H2O
8.
How many atoms of hydrogen are in ethanol? C2H5OH 
a)
5
b)
2
c)
6
d)
9
9.

How many atoms of hydrogen are in a sugar molecule with the formula C6H12O6

a)

12

b)

6

c)

24

d)

18

10.
Which of the following is NOT an element?
a)
H2O
b)
H2
c)
O2
d)
Au
11.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
12.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
13.

Which of the following accurately describes the chemical formula of the molecule shown above?

a)

3CH8O

b)

C3H7O

c)

C4H8O2

d)

C3H8O

14.

Which elements are in the formula shown above?

a)

Tin and Chlorine

b)

Tin, Carbon and Lithium

c)

Sulfur, Nitrogen and Chlorine

d)

Sulfur, Nitrogen, Carbon and Lithium

15.

Which elements are in the formula shown above?

a)

Antimony only

b)

Carbon and Sulfur

c)

Cesium only

d)

Carbon and Silicon

16.

Which elements are in the formula shown above?

a)

Cobalt only

b)

Carbon and Oxygen

c)

Copper only

d)

Carbon and Osmium

17.

How many different elements are in an amino acid with the formula C5H11NO2S?

a)

5

b)

20

c)

18

d)

4

18.
Element or compound?
H2O
a)
element
b)
compound
19.

The blue elements are called...

a)

metals

b)

nonmetals

c)

metalloids

d)

noble gases

20.

The yellow elements are called...

a)

metals

b)

nonmetals

c)

metalloids

d)

noble gases

21.
Black = Carbon (C)
White = Hydrogen (H)
What would be the formula for ethane?
a)
CH4
b)
CH6
c)
C2H2
d)
C2H6
22.

Identifiy the elements in iron bromide.

a)

Iron and iodine

b)

Iron and flourine

c)

Iron and chlorine

d)

Iron and bromine

23.

CH2Cu8 - How many Copper atoms are in this formula?

a)

1

b)

2

c)

8

d)

16

24.
MgO represents 
a)
Magnesium  Hydroxide
b)
Magnesium  Chloride
c)
Magnesium Oxide
d)
Sodium Nitrate
25.

How many atoms are there in this molecule?

a)

2

b)

3

c)

4

d)

5

26.

Which 2 of these are pure elements?

a)

A

b)

B

c)

C

d)

D

27.

Which one of these is a mixture?

a)

A

b)

B

c)

C

d)

D

28.

Which one of these is a pure compound?

a)

A

b)

B

c)

C

d)

D

29.

Which row shown represents compounds?

a)

Top row

b)

Bottom row

30.

Which choice would be a molecule?

a)

O

b)

H

c)

Au

d)

H2

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