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Y8 Practice elements, compounds, symbols and formulae

Total questions: 45

Worksheet time: 32mins

Name
Class
Date
1.

Number of carbon atoms (C) in 2Na₂CO₃

a)
1
b)
2
c)
3
d)
5
2.

The number of sodium atoms (Na) in Na₂CO₃

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

How many elements are in the compound C2H8O ?

a)
2
b)
1
c)
3
d)
0
4.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
5.

How many aluminium atoms are in Al2O3?

a)
3
b)
2
c)
5
6.

How many magnesium atoms are in 10MgCl2?

a)
10
b)
5
c)
20
7.

How many atoms of hydrogen are in this compound

a)
1
b)
2
c)
3
d)
4
8.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
9.
Is the following equation balanced or unbalanced ? 
Al + O2 --> Al2O3
a)
Balanced
b)
Unbalanced
10.

How many hydrogen atoms are in 4H2O?

a)
6
b)
8
c)
2
d)
4
11.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
d)
Left side is balanced
12.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
13.
N2 + H2 = NH4
a)
Balanced
b)
Unbalanced
14.

How many atoms of oxygen (O) in NH4OH?

a)

4

b)

1

c)

5

d)

3

15.

How many atoms of hydrogen (H) in NH4OH?

a)

4

b)

1

c)

5

d)

3

16.

How many atoms of hydrogen (H) in Ca(OH)2?

a)

1

b)

2

c)

3

d)

0

17.

How many atoms of magnesium (Mg) in 3Mg(OH)2?

a)

1

b)

2

c)

5

d)

6

e)

3

18.

How many atoms of oxygen (O) in the products?

HCl + NaOH --> NaCl + H2O

(a)  

19.

How many atoms of hydrogen (H) in the reactants?

HCl + NaOH --> NaCl + H2O

(a)  

20.

How many atoms of hydrogen (H) in the products?

HCl + NaOH --> NaCl + H2O

(a)  

21.

Is this equation balanced?

HCl + NaOH --> NaCl + H2O

a)

yes

b)

no

22.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
23.

Match the molecules

a)

1.

H2O

b)

2.

O2

c)

3.

CO2

d)

4.

NaCl

e)

5.

C₆H₁₂O₆

24.

A chemical substance that is made of two or more DIFFERENT elements that chemically combine together

a)

Element

b)

Compound

c)

Mixture

d)

Molecule

25.

Name the following compound:

CO2

a)

monocarbon dioxide

b)

carbon oxide

c)

carbon dioxide

d)

oxygen carbonide

26.
Name this formula: 
Al2O3
a)
Aluminum Oxide
b)
Aluminum Oxygen
c)
Antimony Oxide
d)
Aluminum (VII) Oxide
27.
Name the compound Na2O
a)
Sodium Oxide
b)
Sodium Dioxide
c)
Sodium Oxygen
d)
Natride Oxide
28.

Calculate the relative formula mass of

water, H2O


[Relative atomic mass:

H = 1, O = 16]

a)

16

b)

18

c)

17

d)

20

29.

Calculate the relative formula mass of

carbon dioxide CO2


[Relative atomic mass:

C = 12, O = 16]

a)

32

b)

41

c)

28

d)

44

30.

Using your periodic table, calculate the formula mass of CH4.

Answer:

(a)  

31.

Using your periodic Table, calculate the formula mass of NH3.

Answer:

(a)  

32.
What is the atomic mass of magnesium?
a)
2
b)
4
c)
12
d)
24
33.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
34.
Question Image

Match the atom to it's Relative Atomic Mass

a)

Magnesium

1.

24

b)

Carbon

2.

12

c)

Oxygen

3.

16

d)

Sulphur

4.

32

35.
What are the 3 particles that make-up the atom?
a)
protons, neutrons, and isotopes
b)
neutrons, isotopes, and electrons
c)
positives, negatives, and electrons
d)
protons, neutrons, and electrons
36.
How many carbon atoms are there in a methane molecule? 
a)
0
b)
1
c)
4
d)
5
37.
What is the total number of atoms in an ammonia (NH3) molecule?
a)
1
b)
2
c)
3
d)
4
38.
Carbon dioxide (CO2) contains how many atoms of oxygen?
a)
0
b)
1
c)
2
d)
3
39.

The atomic number of carbon is...

a)

12

b)

6

c)

18

d)

9

40.

The mass number of an atom is its number of protons plus its number of neutrons.

a)

TRUE

b)

FALSE

41.

Organize these options into the right categories

Categorize the following

carbon dioxide

water

copper

sulfur

Compound
Element
42.

Where is the atomic number?

A
B
C
D
43.

Reorder the following into ascending order of the number of atoms shown.

a)

argon

b)

oxygen

c)

carbon dioxide

d)

methane

e)

sulfuric acid

1)
2)
3)
4)
5)
44.

H₂O is a compound.

a)

TRUE

b)

FALSE

45.
Elements are made of 
a)
many types of atoms 
b)
the periodic table
c)
one type of atom 
d)
molecules 

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