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Chmistry test 1

April 12th, 2020
States of Matter Revision Test
Section A
Multiple Choice/True or False Questions
20 questions 1 mark per
Total 20 marks (Estimated time 20 minutes)
Which theory describes the arrangement and movement of particles in solids, liquids and gases?
Theory of relativity
Kinetic theory
Atomic theory
In which state of matter are the particles mostly touching but arranged in a random way?
In which state of matter do the particles have the most energy?
Why can liquids not be compressed easily?
The particles are in a random arrangement
The particles are closely packed
The particles are free to move over each other
Why do solids have a fixed shape?
The particles are fixed in place
The particles are closely packed
The particles vibrate
What is the name of the change when a liquid becomes a solid?
What is sublimation?
When a solid turns into a gas
When a gas turns into a solid
When a gas turns into a liquid
What eventually happens if energy is continually removed from a liquid?
It boils
It evaporates
It freezes
What eventually happens to a gas if its pressure is increased?
It condenses
It evaporates
It melts
Which of the following will sublime at room temperature and pressure?
Solid carbon dioxide (dry ice)
11. A gas partially fills its container
A. True
B. False
12. The physical state of a type of matter depends mostly upon how its atoms and
molecules are arranged and how they move.
A. True
B. False
13. The higher the temperature of matter the slower the particles are moving
A. True
B. False
14. Particles that make up matter are in a state of constant motion.
A. True
B. False
15. When a warm object is brought near a cool object, the cool object will warm up.
A. True
B. False is
16. Vaporization NOT a change from a liquid to a gas.
A. True
B. False
17. If an object's density is less than that of the fluid it is in, it will float.
A. True
B. False
18. The temperature remains constant when a liquid reaches its boiling point.
A. True
B. False
19. A chef fills a 50 mL container with 43.5 g of cooking oil. What is the density of the
oil? (Round to the nearest 10th) NOTE: Density = 𝑀𝑎𝑠𝑠⁄𝑉𝑜𝑙𝑢𝑚𝑒
A. 1.1 g/ml
B. 0.9 g/ml
C. 8 g/ml
D. 9 g/ml
20. A machine shop worker records the mass of an aluminum cube as 176 g. If one
side of the cube measures 4 cm, what is the density of the aluminum? NOTE:
Density = 𝑀𝑎𝑠𝑠⁄𝑉𝑜𝑙𝑢𝑚𝑒
A. 2.8 g/cm cubed
B. 14.7g/cm cubed
C. 0.4g/cm cubed
D. 44g/cm cubed
Section B
Essay Type Questions
Attempt All Questions
Total 40 Marks
Time Allocated 30 Minutes
1. Use the particulate theory to briefly describe properties of the three
states of matter (12 marks).
Answer: The particulate theory can be used to help explain:
1. the properties of matter
2. what happens during physical changes such as melting, boiling and evaporating
The properties of matter
have a definite
fixed volume
are difficult to
compress as the
particles are already
do not have a
definite shape
flow and fill the
bottom of a
container. They
maintain the same
do not have a
definite shape
expand to fill any
are easily
compressed because
packed closely
are often dense as
there are many
particles packed
closely together
volume unless the
temperature changes
are difficult to
compress because
there are quite a lot
of particles in a
small volume
are often dense
because there are
quite a lot of
particles in a small
there are only a few
particles in a large
are often low
density as there are
not many particles
in a large space
2. Explain how a burning candle demonstrates both physical and chemical
changes. Is evaporation of water a physical change or a chemical change?
Explain your answer (5 marks).
Physical vs Chemical Changes
Physical changes involve either the change in shape or the change in phase of a substance. A
chemical reaction takes a substance and creates new products with new physical and chemical
Answer and Explanation:
A burning candle demonstrates physical changes as the wax melts from one shape into another. A
burning candle demonstrates chemical changes as the wick is burned in a chemical reaction called a
combustion reaction and turns to ash.
Evaporation of water is a physical change. Liquid water turning into gaseous water is a phase
change that is characteristic of physical changes. The water is still water, but the molecules are
spread apart further in the gaseous form.
3. Which characteristics of solid, a liquid, and a gas are exhibited by each
of the following substances? How would you classify each substance? (8
A. A bowl of pudding.
B. A bucketful of sand.
Properties of liquids, solids and gases:
Liquids: definite volume, no definite shape, takes the shape of its container
Solids: definite volume and shape
Gases: no definite volume or shape
Answer and Explanation:
A. A bowl of pudding = liquid
no definitive shape
takes the shape of its container
definite volume
B. A bucketful of sand = solid
sand is a sold
definite volume
each grain of sand has definite shape, although together they move around
4. Why are gases more easily compressed than liquids? Why do liquids
have a greater ability to flow than solids? (10 marks)
All materials which can be seen around us are matter. The atom is the fundamental unit forming an
element. Matter can be present in three different forms viz, gas, liquid && solid. Matters possess
mass, occupies space as well as some volume.
Answer and Explanation:
The solid is one form of matter in which the force of attraction between particles is more as
compared to liquids and the liquid have more force of attraction between particles as compared to
Therefore the space between the particles is minimum in solids, intermediate in liquid and high in
gas. And also the kinetic energy between the particles in solid is minimum and intermediate in liquid
and high in gas.
So the gases can be compressed easily as compared to liquid because there is enough space
between the particles in gas as compared to liquids. In liquids, there is only very little free space
between particles, so the liquid resist the external force and compress slightly.
When one compare liquid and solids, the particles are held very tightly in solids than liquid due to
the greater force of attraction between the particles in solids. Hence, liquid can flow easily as
compared to solids.
So the gases are more easily compressed than liquid. Liquids have a greater ability to flow than
solids due to the less force of attraction between particles in former as compared to latter.
The force of attraction between particles is greater in solid, intermediate in liquids and low in gas.
5. If the air is 20 degrees C, it's hot. If water is 20 degrees C, it's hotter
than air. If steam is 20 degrees C, it's very hot. Why is this true even if the
temperature is the same? (5 marks)
States of Matter:
A substance may exist in any of the three possible states of matter. These differ in various
parameters including, energy, density, forces of attraction and others. It is possible to interconvert
one state into another.
Answer and Explanation:
At the same temperature, the extent of heat present in the three states is different. This can be
attributed to the difference in kinetic energy of these states. The gaseous state is the state of
highest kinetic energy. The solid state particles experience least amount of kinetic energy.
When the particles move more randomly in gases, a greater amount of heat is generated. In solids,
very less heat is generated due to negligible motion of the particles.
Hence, even when the same temperature is maintained, different states have different heats.