Name:
Year 9 Chemical Science
1. The diagram represents an atom. Choose words from the list to label the diagram. (3
marks)
2. Use crosses (x) to complete the diagram to show the electronic structure of a
magnesium atom. The atomic (proton) number of magnesium is 12. (2 marks)
3. Match the words and definitions (3 marks)
Element
Two or more atoms chemically joined together
Molecule
Two or more different atoms chemically joined together
Compound
A substance made from only one type of atom
4. Answer the following questions: (14 marks)
 List three metals:
1. _____________________
2. _____________________
3. _____________________

List three non-metals:
1. _____________________
2. _____________________
3. _____________________

Name one metalloid:
1. _____________________

List three properties of a metal:
1. _____________________
2. _____________________
3. _____________________

List three properties of a non-metal:
1. _____________________
2. _____________________
3. _____________________

List one property of a metalloid:
1. _____________________
5. Using the periodic table answer the following questions: (16 marks)
 Write the element name and atomic number for the following:
Element name
a.
b.
c.
d.
e.
f.

Al
Cl
Ne
Mg
Si
O
Atomic Number
___________________________ ______________________
___________________________ ______________________
___________________________ ______________________
___________________________ ______________________
___________________________ ______________________
___________________________ ______________________
Fill in the blanks:
Rows in the periodic table are called _______________________
Columns in the periodic table are called ____________________

What do magnesium and calcium have in common? (HINT: look at their position in
the periodic table)
__________________________________________
__________________________________________

What do hydrogen and helium have in common? (HINT: look at their position in the
periodic table)
__________________________________________
__________________________________________
6. Name the three components that make up and atom and give their charge (6 marks)
7. What does the mass number of an atom represent? (2 marks)
8. Use your knowledge of atomic calculations to complete the following table:
Name
Atomic
Symbol
Atomic
Number
Atomic
Mass
Protons
Neutrons
Electrons
17
Ag
74
Neon
19
9. List the three types of radioactive decay and briefly describe what occurs in each
type or radioactive decay. (9 marks)
10. When magnesium reacts with chlorine, how many electrons each magnesium atom
loses and how many electrons each chlorine atom gains? (2 marks)
11. In ionic compounds, which type of element tends to gain electrons? (1 mark)
12. In ionic compounds which type of element tends to lose electrons? (1 mark)
13. Complete the following table:
Name
Sodium chloride
Positive Ion
Negative Ion
Formula
Strontium fluoride
Aluminium chloride
Aluminium oxide
14. Match the reactants and products. (3 marks)
Acid and base
Salt, water and carbon dioxide
Acid and carbonate
Salt and hydrogen
Acid and metal
Salt and water
15. In a chemical reaction, mass is conserved. This means that (2 marks)
a) The mass of the reactants stays the same during a chemical reaction
b) The mass of the products stays the same during a chemical reaction
c) The type and number of atoms in the reactants equals the type and number of atoms in
the products
16. If the reactants on the left side of a chemical equation are 2C4H10 + 13O2, the
products in a balanced equation could be (2 marks)
a) 8CO2 + 10H2O
b) 4CO2 + 5H2O
c) 8CO2 + 5H2O
d) 4CO + 10H2O
17. Balance the following equations
a)
Ca
+
O2

b)
Cu2O
+
c)
Al
d)
Li
e)
Pb3O4
f)
Cu
+
+

C
+
C
AgNO3
+
CO2
AlBr3

H2SO4
+
Cu

Br2
CaO
LiSO4


+
Pb
Cu(NO3)2
H2
+
CO2
+
Ag
18. Which one is not true? (2 marks)
a) Photosynthesis cannot occurs in animals
b) Respiration is basically the reverse of photosynthesis.
c) Respiration can be done in both day and night.
d) Respiration is the process through which plants make food for themselves in form of
glucose.
19. Write the word equations for photosynthesis and respiration reactions. (6 marks)
20. Describe the difference of how the ionic and covalent compounds are bonded. (6
marks)
21. List two different properties of ionic compounds and covalent compounds. (4 marks)
22. Define the combustion reaction. Name two products of combustion of fossil fuel and
describe how they affect the environment. (8 marks)