Springfield Convent Senior School
Grade 10 Physical Sciences June 2012
SPRINGFIELD CONVENT SENIOR SCHOOL
Gr 10 Physical Sciences
150 marks
11 June 2012
2 Hours
EXAMINER: G Quinn/B Jansen
MODERATOR: G Quinn/B Jansen
_______________________________________________________________________________________
SECTION A
Answer these questions on your script
QUESTION 1
Give ONE word/term for each of the following descriptions. Write only the word/term next to the question
number (1.1 – 1.5).
1.1
The chemical formula that shows the simplest ratio between the atoms in a compound.
(1)
1.2
Atoms with same number of protons but different mass.
(1)
1.3
Electrons that occupy the outermost energy level of an atom.
(1)
1.4
The type of superposition which occurs when a crest of one wave meets the trough of another. (1)
1.5
The flow of charge from the positive terminal of the battery to the negative terminal.
(1)
[5]
QUESTION 2
Four options are provided as possible answers to the following questions. Each question has only ONE
correct answer. Write only the letter (A-D) next to the question number (2.1 – 2.10).
2.1
Which of the following equations represent physical changes?
I
II
III
A
B
C
D
Page 1 of 11
H2O(g) H2O(l)
N2(g) + H2(g)  NH3(g)
I2(s)  I2(g)
I
II & III
I & III
I, II & III
(2)
PTO
Springfield Convent Senior School
Grade 10 Physical Sciences June 2012
2.2
Study the graph below which shows the temperature change of H2O as it is heated from ice.
Which statement best describes what is happening between B and C
A
B
C
D
2.3
(2)
An unknown substance is brittle, does not conduct electricity and has a dull appearance. It is most
likely........
A
B
C
D
2.4
Ice is turning to liquid water
Temperature of the water is dropping
Water is boiling
Water is turning to steam
a diatomic molecule
a non-metal
a transition metal
compound
(2)
Select the row which gives the correct formula for copper (II) chloride and calcium carbonate.
Copper (II) chloride
CuCl
CuCl2
Cu2Cl
CoCl
A
B
C
D
Calcium carbonate
Ca2CO3
CaCO3
CaCO3
Ca2CO3
(2)
2.5
Consider the symbol below
40
18𝑋
The number of protons in the element X is.........
A
B
C
D
Page 2 of 11
18
22
40
58
(2)
PTO
Springfield Convent Senior School
Grade 10 Physical Sciences June 2012
2.6
Which wave of the electromagnetic spectrum carries the most energy?
A
B
C
D
2.7
(2)
repel even further
drop closer together
drop closer together and then repel even further
remain unchanged
(2)
A learner uses a piece of silk to rub a comb. The comb then becomes positively charged. This net
positive charge accumulates because the comb:
A
B
C
D
2.10
8 × 109 Hz
3 × 10−57 Hz
3 × 10−58 Hz
1 × 10−10 Hz
When a positively charged object touches the metal cap of a negatively charged electroscope, the
leaves will:
A
B
C
D
2.9
(2)
What is the approximate frequency of a photon having an energy 5 × 10 −24 J?
A
B
C
D
2.8
X-ray
Ultraviolet
Gamma
Radio
gains electrons.
gains protons.
loses electrons
loses protons
(2)
An electric current of 5 A is same as
A
B
C
D
5 J·C-1
5 V·C-1
5 C·s-1
5 Ω·s-1
(2)
[20]
TOTAL SECTION A: 25 MARKS
Page 3 of 11
PTO
Springfield Convent Senior School
Grade 10 Physical Sciences June 2012
SECTION B
INSTRUCTIONS
1.
2.
Show the formulae and substitutions in ALL calculations.
Round off your answers to TWO decimal places, where applicable.
QUESTION 3
The table below shows some of the physical properties of elements in periods 2 and 3 of the periodic table.
Element
Atomic Number
Atomic Radius
(pm)
Melting Point
(°C)
Boiling Point
(°C)
Li
Be
B
C
N
O
F
Ne
Na
Mg
Al
Si
P
S
Cl
Ar
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
145
112
85
70
65
60
50
38
186
150
125
110
100
100
100
75
180
1278
2300
3500
-210
-218
-220
-249
98
639
660
1410
44
113
-101
-189
1347
2970
2550
4827
-196
-183
-188
-246
883
1090
2467
2355
280
445
-35
-186
First
Ionisation
energy
(k.J.mol-1)
520
899
801
1086
1402
1314
1681
2081
496
738
578
786
1012
1000
1251
1521
3.1
Plot a graph of atomic radius by atomic number.
(5)
3.2
Describe the trends seen in the graph.
(2)
3.3
Define the term First Ionisation Energy.
(2)
3.4
Describe the trends in first ionisation energy seen in the table.
(2)
3.5
Explain the trends described in 3.4 with reference to atomic radius.
(4)
3.6
Which elements in the table would be gases at room temperature (25°C)? Refer to evidence from
the table to support your answer.
(4)
[19]
Page 4 of 11
PTO
Springfield Convent Senior School
Grade 10 Physical Sciences June 2012
QUESTION 4
Consider the following list of scientists who contributed to the development of modern atomic model.
Rutherford
Democritus
JJ Thomson
Dalton
Bohr
Below is a list of different contributions made to the development of the atomic model
A
Conducted a gold foil experiment to determine that an
atom is made up of a dense core and space around the
nucleus which is mostly empty
B
Matter is made up of tiny particles called atoms
C
D
E
4.1
4.2
Atoms are solid spheres. Atoms of a particular element
are the same and atoms of different elements are
different
Electrons move in orbits around the nucleus. Different
orbits contain elements with different levels of energy
The atom is a positive sphere with electrons randomly
spread out within the sphere.
Write the name of the scientists in chronological order (oldest to newest contribution).
(3)
Write the letter of the description which best matches their contribution to the development of the
atomic model.
(5)
[8]
Page 5 of 11
PTO
Springfield Convent Senior School
Grade 10 Physical Sciences June 2012
QUESTION 5
Consider the list of substances below.
5.1
Ice
Calcium carbonate
Water vapour
Fluorine
Lithium
Bronze
Oxygen
Methane
Hydrogen
Iron(II) oxide
Carbon
Sulphur
Describe the difference between the molecules of H2O in ice in comparison to water vapour.
(3)
Lithium and Fluorine bond to form lithium fluoride, an ionic compound.
5.2
Write the name and formula of one other substance in the table which also contains
an ionic bond.
(2)
5.3
Draw an aufbau diagram for fluorine.
(2)
5.4
Write the electron configuration for lithium.
(2)
5.5
Explain, with reference to the electron configuration, why the formula for lithium fluoride is LiF?
(3)
Two substances in the list are elements which exist naturally as covalently bonded diatomic molecules.
5.6
Define the term covalently bonded.
(2)
5.7
Use a Lewis diagram to show the covalent bond in a water molecule
(2)
Bronze is an alloy of copper and tin
5.8
Name and describe the bonding present in a sample of bronze
5.9
Give TWO physical properties you would expect bronze to have.
(2)
(2)
Carbon can take the form of graphite or diamond.
5.10 Explain why diamond is a much harder and stronger substance than graphite.
Page 6 of 11
(2)
[22]
PTO
Springfield Convent Senior School
Grade 10 Physical Sciences June 2012
QUESTION 6
Bob the backyard scientist conducted the following experiment.
Step 1: Place 10 g of zinc granules in the bottom of a glass beer bottle.
Step 2: Add 20g of hydrochloric acid.
Step 3: Place a balloon on the bottle mouth and collect (in the balloon) the hydrogen gas
that forms until the zinc has completely reacted.
Bob observed the balloon inflate and the bottom of the bottle became warm.
6.1
6.2
6.3
6.4
Write a balanced chemical reaction for the reaction that takes place inside the bottle.
(3)
What evidence suggests that a chemical reaction takes place?
(2)
Bob weighed the contents of the bottle after the experiment and found it to have a mass of 26g?
Calculate the mass of the hydrogen in the balloon. Show your working.
(2)
Name and write the law which allows you to calculate the mass in the balloon.
(3)
Bob tied the balloon and then hung it from the washing line. He lit the end of a long stick and heated the
balloon. Shortly after there was a loud bang and Bob observed a large flame as the hydrogen gas reacted
with the oxygen gas in the air to form water.
6.5
Using an appropriate key represent the reaction above diagrammatically (ensure your diagram
shows a balanced equation)
(3)
6.6
What type of reaction is the reaction above? (Write only SYNTHESIS, DECOMPOSITION or
DISPLACEMENT)
(2)
[15]
QUESTION 7
Amplitude
Consider the transverse wave below:
time
7.1
Define the following terms:
7.1.1 amplitude.
7.1.2 wavelength
7.2
(2)
(2)
Draw a wave which has DOUBLE the amplitude, but HALF the wavelength. Include values on your
axes.
(4)
[8]
Page 7 of 11
PTO
Springfield Convent Senior School
Grade 10 Physical Sciences June 2012
QUESTION 8
A metronome is a mechanical device used by musicians to regulate the tempo (speed) at which they are
playing. A wind-up spring produces a force that causes the metronome arm to swing from side to side in a
repetitive pattern. As the arm swings it makes a ‘tick-tock’ sound, much like a clock.
metronome arm
weight
wind-up spring
8.1
8.2
8.3.
8.4.
How can the movement of the metronome arm be compared to that of a wave?
(1)
The metronome produces a ‘tick tock’ sound – which wave form is responsible for the production
of sound?
(1)
As the sound wave travels to your eardrum, which medium does it pass through?
(1)
If the metronome was placed underwater in a pool, would you hear
the ‘tick tock’ differently? Explain your answer?
(3)
Dependent on the piece of music you are playing, you may want to hear the
beat (ticking of the metronome) faster or slower. The period of the
metronome is determined by the weight on the metronome arm. The
weight can be slid to different positions along the arm. The closer the weight to the bottom of the
metronome arm the faster the arm moves in a cycle.
8.5
8.6
8.7
8.8
Define the term ‘period’.
(2)
When the weight is at the top of the metronome arm, is the frequency of the ‘tick tock’ high or
low? Would you use this position for a song with a quick beat or a slow one?
(2)
If a metronome is moving at a frequency of 160 ticks PER MINUTE, what is the period?
(4)
Where could a metronome be placed so that, although it produces sound, nothing is heard? Explain
your answer.
(3)
[17]
Page 8 of 11
PTO
Springfield Convent Senior School
Grade 10 Physical Sciences June 2012
QUESTION 9
9.1
SONAR (SOund Navigation And Ranging) is a device that uses reflected sound waves to measure
underwater depths. If a SONAR signal has a frequency of 288 Hz and the speed of sound in water is
1.45 × 103 m·s-1, what is the wavelength of the sonar signal?
(4)
9.2
The use of ultrasound in foetal testing of pregnant women follows a similar process to that of
SONAR. Draw a flow chart to explain how this works.
(4)
[8]
QUESTION 10
Many Blackberry phone covers offer a power saving capability. When the phone is placed inside the cover,
a magnet in the cover is attracted to a magnet inside the phone. This in turn, closes a circuit which
switches off certain cell functions.
10.1
If the magnet inside the case is a miniature bar magnet, draw the magnetic field which would be
evident around it.
(3)
The following extract was taken from a blackberry chat forum:
“I got my phone on Monday and everything worked perfectly! On Friday I received my new case and have
been using it since. I read a post on this forum that spoke about a magnetic case messing up the compass
function on their phone....so I checked mine in 5 different areas and it does not work anymore. I can make it
look up or down but it will not go side to side...I have not dropped it or anything. The only thing that has
changed is the cover....”
10.2
10.3
Explain why this may have happened?
(1)
If the compass function on the phone was working efficiently and was being used as a standby form
of navigation by a ship’s captain, what would he have to take into consideration? Why?
(3)
[7]
Page 9 of 11
PTO
Springfield Convent Senior School
Grade 10 Physical Sciences June 2012
QUESTION 11
Consider the following series of diagrams which illustrate a positive rod being brought close to two neutral
spheres.
11.1
Explain the process which is taking place in diagram (b)
(4)
11.2
What is the significance of the two spheres being in contact when this process takes place?
(2)
11.3
After the two spheres are moved apart as seen in diagram (c), what type of force will they
experience? Explain your answer.
(2)
11.4
The positive charge illustrated in diagram (d) has a charge of + 3µC. What would you predict to be
the charge on the negative sphere? Explain your answer.
(3)
11.5
Calculate the number of electrons which was transferred between the spheres during this exercise.
(3)
[14]
Page 10 of 11
PTO
Springfield Convent Senior School
Grade 10 Physical Sciences June 2012
QUESTION 12
Consider the following circuit:
A1
3Ω
3Ω
S1
6Ω
A2
Switch S1 is open
12.1
Calculate the resistance in the circuit.
(2)
The switch S1 is now closed.
12.2
Calculate the resistance in the circuit.
(3)
12.6
The current now measured on A1 is 3A. What is the reading on ammeter A2?
(2)
[7]
TOTAL SECTION B: 125 MARKS
TOTAL: 150 MARKS
Page 11 of 11
PTO
Springfield Convent Senior School
Grade 10 Physical Sciences June 2012
MEMO
1.1
1.2
1.3
1.4
1.5
Empirical formula
Isotopes
Valence
Constructive interference
Conventional current





[5]










2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
C
A
B
B
A
C
A
B/C
C
C
3.1
3.2
Axis 
Units
Plotting
Atomic radius decreases across period  increases down group 
(5)
(2)
3.3
Energy required to remove outermost electron from an atom in the gaseous phase
(2)
3.4
1st IE increases across period  decreases down group 
(2)
3.5
AR decreases across period thus electrons are closer to positive nucleus 
AR increases down group thus electrons are not as close/shielded to positive nucleus 
(4)
3.6
4.1
5.1
5.2
5.3
[20]
N, O, F, Ne, Cl, Ar all -1 for each incorrect/missing
Have BP less than 25°C  thus gas 
Democritus
Dalton
JJ Thompson
Rutherford
Bohr
B
C
E
A
D
(4)
[19]
Names in correct order 
3-4 correct 
1-2 
[8]
In ice they:
are closer together  less kinetic energy  stronger IM forces 
Iron(II) oxide  FeO
(3)
(2)

Page 12 of 11
(2)
PTO
Springfield Convent Senior School
Grade 10 Physical Sciences June 2012
5.4
1s22s1 
5.5
5.6
5.7
5.8
5.9
5.10
6.1
6.2
6.3
6.4
6.5
6.6
(2)
Each lithium ion needs to donate one electron  and
each fluorine needs to accept one electron
thus the ratio needs to be 1:1 
(Accept similar wording)
Sharing  of electrons 
(3)
(2)

Metallic  sea of delocalised electrons 
Malleable
Conducts electricity
Ductile
Conducts heat
ANY TWO 
Shiny
Sonorous
Carbon bonds with other carbons in 3D
(2)
(2)
(2)
(2)
[22]
(3)
(1)
Zn + 2HCl  → ZnCl2 + H2 
bal 
Gas is given off/ new products are formed 
Mass of acid and zinc = mass in bottle + mass of hydrogen
20 + 10 = 26 + H2 mass

Thus H2 = 4g 
Law of conservation of mass  In a chemical reaction the mass of the products
will be equal to the mass of the reactants
Appropriate equation  Balanced 
(2H2 + O2 → 2H20)
Key 
Synthesis 
(3)
(3)
(3)
(2)
[15]
7.1.1 Maximum displacement  from position of rest 
7.1.2 distance between 2 consecutive  points in phase 
7.2
amplitude = 2 
Wavelength = 1.5 
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
(2)
(2)
(4)
[8]
repetitive motion 
longitudinal 
air particles 
yes 
Sound would be muffled  because of the movement of the water 
(Sound travels faster in water since particles are closer together.)
the time taken  for 1 complete oscillation 
low  Slow 
160 / 60 = 2.67 Hz
1
1
T

 0.375 
f
2.67
vacuum 
No particles  to carry vibrations 
Page 13 of 11
(1)
(1)
(1)
(3)
(2)
(2)
(4)
(3)
[17]
PTO
Springfield Convent Senior School
Grade 10 Physical Sciences June 2012
v fλ
9.1
9.2
1.45  103  288λ
λ  5.03m
transducer emits signal 
(4)
enters mothers stomach
Signal bounces back
Info interpreted and image created 
10.1
10.2
10.3
11.1
11.2
11.3
11.4
11.5
(4)
[8]
direction of field lines
Shape of field 
No crossing of lines 
(3)
the two magnetic fields (compass + case) interact with each other
(1)
angle of declination
Magnetic material shifting and therefore mag S pole is not exactly on geo N pole Captain would
have to adjust direction 
(3)
[7]
As the positive rod approaches, electrons in the closest sphere are repelled, resulting in
polarisation. This causes the closest sphere to become negatively charged and the furthest
sphere to become positively charged.
electrons move from sphere to sphere
force of attraction
Opposite charges attract
-3µC
Total charge before = 0 and charge is always conserved
3 106
 1.88 1013
19
1.6 10
(4)
(2)
(2)
(3)
(3)
[14]
12.1
12.2
12.3
R = r1 + r2 = 3+3 = 6Ω
1
1 1
1 1 3
 
  
Rpar r1 r2
3 6 6
1A
Page 14 of 11
(2)
Rpar = 2
Rtot= 2+3 = 5Ω
(3)
(2)
[7]
PTO