Wynberg Boys’ High School
Grade 10 Physical Sciences Test
Topic: Matter and models
31 January
Marks 50
Time 1 hour
Set by Ty
Moderated by Th, Aa, Ta
Instructions:
1 Answer section A on the answer sheet provided
2 Answer section B on lined paper
3 Non-programmable calculators may be used
4 Number your answers exactly as laid out in the question paper
5 Once you have finished the test, estimate your mark. If your estimate is correct,
you will be awarded an additional mark
SECTION A
Question 1
One word items
Give one word / term for each of the following descriptions. Write only the word/term next
to the question number (1.1 - 1.3) on the attached ANSWER SHEET.
1.1
Atoms with the same atomic number, but different mass numbers
1.2
The process in which a solid turns directly into a gas
1.3
A mixture in which the different parts are distinguishable
Question 2
[3 x 1 = 3]
Multiple choice questions
Four possible options are provided as answers to the following questions. Each question has
only ONE correct answer. Choose the answer and make a cross (X) in the block (A - D) next to
the question number (2.1-2.6) on the attached ANSWER SHEET.
2.1
The atomic number of an element is always the same as the number of
A.
nucleons
B
neutrons
WYNBERG BOYS’ HIGH SCHOOL
PHYSICAL SCIENCES DEPARTMENT
C
electrons
D
protons
2.2
Alchemy is an ancient field of study that attempted to turn lead into gold.
We now know that this can be easily achieved by
A
B
C
D
2.3
The temperature of a substance is a measure of:
A
B
C
D
2.4
A
2.6
the average mass of the particles that make up the substance
the average kinetic energy of the particles that make up the substance
the maximum kinetic energy of the particles that make up the substance
the boiling point of the substance
The charge of an atom is
positive
2.5
A
removing 3 nucleons from the nucleus of a lead atom
adding 3 nucleons to the nucleus of a lead atom
removing 3 protons from the nucleus of a lead atom
adding 3 neutrons to the nucleus of a lead atom
B
negative
C
neutral
D none of these
Which of the following real atoms has twice as many neutrons as 126C
B
14
6
C
23
11
Na
C
23
12
Mg
D
24
12
O
If Rutherford had used neutrons instead of alpha particles in his scattering experiment,
the neutrons would:
A
B
C
D
Not deflect because they have no charge
Have deflected more often
Have been attracted to the nucleus
Have given the same results
[6 x 2 marks = 12]
WYNBERG BOYS’ HIGH SCHOOL
PHYSICAL SCIENCES DEPARTMENT
SECTION B
Complete Section B on lined paper.
Question 3
Consider the table which has information
about various elements
Element
Copper
Oxygen
Carbon
Sulphur
Melting
point (oC)
1083
-218,4
3500
112,8
Boiling
point (oC)
2567
-183
4827
444,6
3.1
On the ANSWER SHEET provided, write
down the state of matter that each element
would be in at room temperature, -200 oC
and 1500 oC.
(6)
3.2
By referring to the boiling points of oxygen and sulphur, state which element has stronger
intermolecular forces.
(1)
3.3
Explain your answer to QUESTION 3.2
3.4
With the aid of a sketch, explain the microscopic differences between liquids and gasses.
(4)
[13]
(2)
Question 4
Complete the following table on your ANSWER SHEET.
Element
24
12
Atomic number
No. of protons
No of neutrons
No of electrons
12
Mg
7
8
7
35
27
Cl 
36
17
29
[7]
WYNBERG BOYS’ HIGH SCHOOL
PHYSICAL SCIENCES DEPARTMENT
Question 5
Consider the following unknown element:
24
11
X
5.1
Give the atomic number of X
(1)
5.2
How many neutrons does X have?
(2)
5.3
Identify element X
(1)
5.4
Using the same notation, write down two isotopes of potassium
(2)
[6]
Question 6
Copper has two stable isotopes, namely copper-63 and copper-65. The naturally occurring
percentages of each of these isotopes are 69,17% and 30,83% respectively.
Use the above information to accurately calculate the relative atomic mass of copper.
[5]
Question 7
From the following list, choose 3 scientists and explain their contribution to our
understanding of the atom:
[3]
Bohr, Marie Curie, Democritus, Thompson (not the teacher), Dalton,
Question 8 (Bonus question)
How many ping pong balls could you fit into the fishbowl (the area enclosed by glass).
Show all your working and estimates
[1]
Total: 50
WYNBERG BOYS’ HIGH SCHOOL
PHYSICAL SCIENCES DEPARTMENT
Wynberg Boys’ High School
Grade 10 Physical Sciences Test
Topic: Matter and Models
31 Jan
Marks 50
Time 1 hour
Set by Ty
Answer sheet
NAME:__________________________________
TEACHER:_______
SECTION A
Estimated Mark
Question 1
Actual Mark
1.1
_____________________________________________[1]
1.2
_____________________________________________ [1]
1.3
_____________________________________________ [1]
Question 2
2.1
2.2
2.3
2.4
2.5
2.6
A
A
A
A
A
A
Question 3
B
B
B
B
B
B
C
C
C
C
C
C
D
D
D
D
D
D
Element
-200 oC
Room temp
1500 oC
Copper
Oxygen
Carbon
Sulphur
[6 x 2 marks = 12]
WYNBERG BOYS’ HIGH SCHOOL
PHYSICAL SCIENCES DEPARTMENT
Element
24
12
Atomic number
No. of protons
No of neutrons
No of electrons
12
Mg
7
8
7
35
27
Cl 
36
17
29
Question 4
WYNBERG BOYS’ HIGH SCHOOL
PHYSICAL SCIENCES DEPARTMENT