Physical Science – 416
Theory Exam
Name : _________________________________
School : _________________________________
Teacher : _________________________________
Date : _________________________________
Multiple Choice Section (maximum of 4 points per question)
1
In the lab, you are asked to identify a pure substance
using only one characteristic property.
Among the following, which one would you choose?
A) It’s state.
B) It’s temperature.
C) It’s boiling point.
D) It’s mass.
2
In a lab, some pebbles are heated for fifteen minutes.
Once the temperature raises to 1000° C, you let the
pebbles cool off. Before and after heating the pebbles,
tests were conducted .The table below shows the
results.
Tests
Before heating
After heating
Mass reading
10 g
5.7 g
Color of the
dark gray
white
pebbles
Reaction with none
effervescence
water
Reaction with effervescence
none
vinegar
Based on these results, what can be concluded?
A) A physical change occurred because the nature of
the substance stayed the same.
B) A chemical change occurred because the nature of
the substance was modified.
C) A physical change occurred because the nature of
the substance was modified.
D) A chemical change occurred because the nature of
the substance stayed the same.
3
In his atomic theory, Dalton stated four propositions:
i. The atom is indivisible.
ii. Atoms of the same element are the same.
iii. Atoms of different atoms are different.
iv. Atoms react together to form new
compounds.
Which of the following can statements can be
explained by his theory?
A)
The existence of static electricity.
B)
The nucleus is in the center of the atom.
C)
Electrons rotate around a nucleus in stable
orbits.
D)
The combination of dihydrogen and dioxygen
allows us to have water.
4
Edua is drawing a model of aluminum chloride (AlCl3)
using the following symbols:
Which one of Edua’s 4 drawings is correct?
A)
Model 1
B)
Model 2
C)
Model 3
D)
Model 4
5
Below are descriptions of four elements in the periodic
table.
Element in the second period that
Element
possesses two electrons more than
1
Helium.
Element Soft metal in the third period that
2
possesses one valence electron and reacts
violently with water.
Element Element in the fourth period that is
3
found in bones and teeth.
Element Element in the third period that
4
possesses properties of both metals and
non-metals.
Which of the above elements are in the same
chemical family?
A) 1 and 2
B)
2 and 4
C)
1 and 3
D) 3 and 4
6
When you rub a balloon on hair, why do the hairs stand
up and move away from each other?
A) The hairs have different charges and
therefore repel other.
B)
The hairs have different charges and
therefore attract each other.
C)
The hairs all have the same charge and
therefore repel each other.
D) The hairs all have the same charge and
therefore attract each other.
7
The magnetic field of the Earth is similar to that of
one produced by a bar magnet.
In the diagrams below, which one represents the
correct orientation of the bar magnet with respect
to the geographic poles of the Earth?
A)
Terrestrial North
Pole
N
S
C)
C.
Terrestrial North S
B)
Terrestrial North
Pole
N
S
D)
Terrestrial North
Pole
S
N
N
8
To set up an electrical circuit, you must use materials
that are very good conductors of electricty. You are
given four conducting wires made of copper and
labelled with their length and diameter.
The following table gives the length and diameter of
each of these wires.
WIRE
LENGTH (cm)
DIAMETER (mm)
1
250
2.4
2
3
4
250
30
30
0.8
2.4
0.8
Which of the above wires is the best conductor of
electricity?
9
A) Wire 1
C) Wire 3
B) Wire 2
D) Wire 4
Which of the physical units is associated with energy?
A) volt/ampere
B)
volt ampere
C)
joule second
D) joule/second
10
The electric circuit illustrated below consists of a
power supply and resistors R1, R2, R3 and R4.
10 !
10 !
R1
R2
R3
R4
10 !
10 !
What is the equivalent resistance of the circuit?
11
A) 0.4 Ω
C) 10 Ω
B) 2.5 Ω
D) 40 Ω
Here are four diagrams of electric circuits.
2
1
R2
R1
R2
R1
A
A
A
4
3
R2
R1
R1
R2
A
Which diagrams show the correct connection of the
ammeter if we want to measure the current in the
battery?
A) 1 and 2
B)
2 and 3
C)
2 and 4
D) 3 and 4
A
12
A student builds the two circuits shown below. The
batteries and the bulbs are the same in both circuits.
V1
In each circuit, a voltmeter is placed across one of the
bulbs.
What is the ratio of the potential difference of
V1/V2?
13
A)
1/3
B)
1/2
C)
1
D)
2
On day during the winter, an electrical clothes dyer,
operating at a power of 5 000 W and a voltage of
240 V is used for a period of three hours.
How much electric energy does this dryer consume
during that period?
14
A) 15 kJ
C) 36 000 kJ
B) 900 kJ
D) 54 000 kJ
Pasha wants to make some tea. She takes an amount of
water and puts it into a kettle. The temperature of the
water is 20ºC. She wants to bring the water to a boil
(100ºC).
301 680 joules of energy is used to raise the
temperature of the unknown quantity of water from
20ºC to 100ºC?
What is the mass of the water in the kettle?
15
C) 900 g
B) 720 g
D) 3600 g
Which of the following is neither acidic nor basic?
16
A) 0.001 g
A) H2SO4
C) Mg(OH)2
B) HNO3
D) K2S
The following table gives the colours of the indicators
phenolphthalein and methyl red according to the pH of
the solution they are found in.
Phenolphthalein
pH
Colourless
1
2
Methyl Red
3
Red
4
Pink
5
6
7
8
Orange
Red
9
10
11
12
13
Yellow
A mixture of these two indicators is added to a neutral
solution.
What colour will the mixture of the two indicators
be in this neutral solution?
A) Colourless
C) Orange
B) Yellow
D) Pink
14
17
In the Arctic, ice is melting much earlier in the spring.
Greenhouse gases are thought to be the culprit.
From the following list of gases, which one
contributes the most to the increase in the
temperature of the atmosphere?
A)
sulfur dioxide (SO2)
B)
chlorofluorocarbon (CFC)
C)
carbon dioxide (CO2)
D)
nitrogen (N2)
18
The conservation of mass is one of the most
fundamental laws of nature.
You mix 168g of sodium bicarbonate with 120g of
vinegar.
You then get 88g of carbon dioxide, 36g of water and
a certain amount of salt.
Give the mass of the salt?
A) 120g
B)
164g
C)
184g
D) 288g
19
An aqueous solution of sodium hydroxide (NaOH), has a
concentration of 20g/L. The mass of the solute is 80g.
What is the volume of the solution?
A)
0.25 L
B)
1.2 L
C)
1.5 L
D)
4.0 L
Extended Answer Section (maximum of 4 points per question)
20
Two colorless and transparent liquids have the same
boiling point. We are not sure if we are in the
presence of two identical liquids.
How can you check if those two liquids are identical
or not?
21
You are given a sample bottle of five elements out of
the first twelve of the periodic table. Each bottle has
a sticker on which specific characteristics are written.
Below is what you find written on each sticker;
Bottle
A
B
C
Characteristics
Has 5 protons and 6 neutrons.
Is the second Noble gas in the periodic
table.
Has the following configuration
2
6
D
E
Can place all its electrons on the first
two shells (orbits).
Has to loose an electron to become as
electronically stable as element B.
Which element does each sticker describe?
A:
B:
C:
D:
E:
22
Two electric circuits are made of a battery and two
resistors.
The table below gives for each circuit the current in
the battery (IT), in R1 (I1), and in R2 (I2).
Circuit
I1
I2
IT
1
4
6
10
2
2.4
2.4
2.4
From the data given in the table above, draw a
diagram of each circuit.
Circuit 1
Circuit 2
23
Mary is looking at buying a new hairdryer from the
Northern Store.
They are selling two different models.
The rating plate for each model is given below.
Model A
Serial
No.:
SMM‐5002
12
0
V
1.2
kW
60
Hz
Model B
Serial
No.:
VBS‐5004
120V
1600
W
60
Hz
Mary wants to by the model that will use the least
amount of electricity and costs the least to use.
Electricity costs $0.86 per kW•h and the hair dryer
will be used 0.25 h a day.
A) Which model will be cheaper to use (show your
work)
B) Calculate how much money it will cost Mary to
use the hair dryer if she uses it every day
for a year.
24
A student has prepared a 400 mL of a saline solution
containing 80 g of NaCl.
He has forgotten to measure the amount of water
needed to prepare the solution.
Describe what you would do to find the amount of
water he used.
25
One of the principle constituants of gas is octane
(C8H18). When an all terrain vehicle is running the
combustion of gas releases Carbon dioxide (CO2) and
water vapour into the atmosphere.
The equation of the reaction is as follows :
C8H18 + O2
CO2 + H2O
Balance the equation of the chemical reaction?