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HIA International — Grade 8

Unit 1: Photosynthesis and the carbon cycle

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Unit 2: Properties of materials

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Unit 3: Forces and energy

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Unit 4: Maintaining life

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Unit 5: Reactivity

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Unit 6: Sound and space

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Unit 7: Genes and inheritance

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Unit 8: Rates of reaction

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Unit 9: Electricity

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Quiz

5.6 Properties Of Gases

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Properties Of Gases Checkpoint Chemistry quiz: free practice for Cambridge Checkpoint (chemistry). Work through this Properties Of Gases Checkpoint Chemistry quiz and get instant feedback on every answer. If you get stuck, review the 15.6 Properties of gases lesson. More practice: Cambridge Checkpoint (chemistry) — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 50
  • Passing grade: B+
  • Time limit:
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1.
Which statement correctly describes oxygen?
a gas giving a squeaky pop with a lighted splint
a gas that turns limewater cloudy
a solution used to test for carbon dioxide
a gas that relights a glowing splint
2.
Which statement correctly describes hydrogen?
a gas that relights a glowing splint
a gas that turns limewater cloudy
a solution used to test for carbon dioxide
a gas giving a squeaky pop with a lighted splint
3.
Which statement correctly describes carbon dioxide?
a gas that relights a glowing splint
a solution used to test for carbon dioxide
a gas that turns limewater cloudy
a gas giving a squeaky pop with a lighted splint
4.
Which statement correctly describes limewater?
a gas that relights a glowing splint
a gas giving a squeaky pop with a lighted splint
a gas that turns limewater cloudy
a solution used to test for carbon dioxide
5.
Which of these is the FIRST step in the correct order?
choose the correct test
use the observation to identify the gas
collect the gas
apply the test safely
6.
Which step comes immediately after "choose the correct test"?
collect the gas
use the observation to identify the gas
apply the test safely
7.
Which practical work belongs to Properties Of Gases?
Compare samples using fair tests for appearance, conductivity, hardness and malleability
Compare pure metals with alloys and connect composition to material properties
Link material properties to uses such as wires, tools, containers and construction
Use the glowing-splint, lighted-splint and limewater tests under supervision
8.
Aisha heats a sealed rigid steel can of air in a water bath and records the pressure inside with a gauge. Her results are plotted on the graph. Use the graph to estimate the pressure at 50 °C.
Dr Dabour Hub Academy - figure 1
About 125 kPa
About 111 kPa
About 118 kPa
About 59 kPa
9.
Tom seals the end of a syringe of air and pushes the plunger in, as shown. The temperature stays the same. Which statement explains why the plunger becomes harder to push?
Dr Dabour Hub Academy - figure 2
The particles are squashed smaller, so they push back like springs
The same particles hit the walls more often, raising the pressure
Some particles escape past the plunger, so the gas gets weaker
The particles slow down, so they hit the plunger with more force
10.
Kofi opens a perfume bottle in a still room and times how long it takes a partner to smell it at different distances. He repeats this with the room heated. Which conclusion is best supported by his graph?
Dr Dabour Hub Academy - figure 3
The smell spread faster in the cooler room at every distance
Temperature only made a difference at the 1 m distance
The perfume particles travelled at a steady 1 m every 30 s
The smell spread faster in the warmer room at every distance
11.
Liam uses this set-up to check that the gas made in the flask is carbon dioxide. The flask fizzes strongly, but after five minutes the limewater is still clear. What is the most likely reason?
Dr Dabour Hub Academy - figure 4
The tube ends above the limewater, so the gas never bubbles through it
Carbon dioxide turns limewater blue, which is hard to see in the tube
The gas is hydrogen, because every gas that fizzes is hydrogen
Limewater only turns milky if it is heated with a Bunsen burner
12.
The four boxes show particles drawn by students. Which box best represents a sample of dry air?
Dr Dabour Hub Academy - figure 5
Box B, because air is one compound of several elements
Box C, because air is mostly made of one gas only
Box A, a mixture of different molecules spread far apart
Box D, because the particles in air are closely packed
13.
Nadia adds weights to the plunger of a sealed syringe of air and plots the graph shown. What does the graph show happens to the volume when the pressure is doubled from 100 kPa to 200 kPa?
Dr Dabour Hub Academy - figure 6
The volume doubles, from 100 cm³ to 200 cm³
The volume stays at 100 cm³ as gases cannot compress
The volume falls by 20 cm³, from 100 cm³ to 80 cm³
The volume halves, from 100 cm³ to 50 cm³
14.
Mei tests four unlabelled gases. Using her results, which gas is hydrogen?
Gas P in the table
Gas Q in the table
Gas R in the table
Gas S in the table
15.
A brewery stores tanks of a gas that can make workers faint if it builds up. The safety officer fits the gas detectors near the floor. Using the table, which gas is most likely stored?
Hydrogen, since it is the least dense gas
Carbon dioxide, as it is denser than air
Helium, as it is less dense than air
Nitrogen, since it is denser than air
16.
Omar measures the pressure of the same bicycle tyre at different times of day. No air was added or let out. Which reading is most likely anomalous?
The 06:00 reading
The 15:00 reading
The 18:00 reading
The 12:00 reading
17.
Jamal seals three syringes and pushes each plunger with the same force. Which statement best explains his results?
Air has big gaps between its particles, so it can be compressed
Air particles shrink when pushed, so the air takes up less room
Water particles are larger than air particles, so they cannot move
Sand is a solid, so its particles can be squeezed much more than air
18.
A snack company fills some bags of crisps with air and others with nitrogen. Which explanation of the results is best?
Nitrogen is a food, so it feeds the crisps and keeps them fresh
Nitrogen is denser than air, so it presses the crisps together
Nitrogen is unreactive, but oxygen in air reacts with the crisps
Air contains no oxygen, so crisps stored in it dry out quickly
19.
Some fire extinguishers spray carbon dioxide onto burning electrical equipment. Which pair of properties makes carbon dioxide useful for this?
It relights flames and is less dense than air
It is lighter than air and reacts with the fire
It turns limewater milky and it is a liquid
It does not support burning and is denser than air
20.
A hospital oxygen cylinder of volume 10 dm³ can release about 2000 dm³ of oxygen at normal pressure. Why is this possible?
Gas particles are far apart, so many can be pushed close together
Oxygen particles shrink to a smaller size inside a steel cylinder
Oxygen turns into a solid inside the cylinder, which takes less space
The cylinder makes new oxygen particles when the valve is opened
21.
Zara collects a test tube of gas from the reaction of zinc with dilute acid and wants to test it for hydrogen. Which is the safest good method?
Collect a large flask of the gas and push a flame deep inside it
Hold a lighted splint at the mouth of the small tube, with goggles on
Smell the gas carefully first, then hold a glowing splint inside the tube
Seal the gas in a jar and warm it with a Bunsen burner to see if it pops
22.
Priya investigates how the temperature of a gas affects its pressure, using a flask connected to a pressure gauge in water baths. Which variable must she keep the same for a fair test?
The temperature of the water bath each time
The pressure reading shown on the gauge
The amount of air sealed inside the flask
The time of day when she reads the gauge
23.
Burnt toast in a kitchen downstairs can soon be smelled in a bedroom upstairs, even with no fan or draught. What explains this?
Smell particles are pulled upstairs by the warm radiators
Air particles stay still while the smell particles fall downwards
Smell particles only travel through walls and floors
Smell particles move randomly and spread out through the air
24.
Ben has three gas jars labelled 1, 2 and 3. One contains oxygen, one carbon dioxide and one hydrogen. Which plan would identify all three gases?
Try a lighted splint in each, then test any gas that puts it out with limewater
Bubble each gas through limewater and identify all three from the colour
Put a glowing splint in each; the one that goes out must be hydrogen
Look at the colour of each gas and compare it with a chart
25.
Leo pumps up a football to the right pressure in a warm sports hall, then takes it outside where it is 3 °C. The ball feels softer. Why?
Cold air particles shrink, so they no longer fill the whole ball
The cold particles move more slowly and hit the inside less hard and less often
Some air particles freeze into ice crystals inside the ball in the cold
Cold air contains fewer particles because it has less oxygen in it
26.
Why do gases have a much lower density than solids and liquids made of the same substance?
Their particles have no mass because they move so quickly
Each gas particle is far bigger than the same particle in a solid
Gases are made of different kinds of atoms from solids
Their particles are far apart, so there is little mass in each cm³
27.
An aerosol can of deodorant has the warning "Pressurised container: do not expose to temperatures above 50 °C". Which is the best reason for this warning?
Heating makes the gas inside turn back into a solid
Heating lowers the gas pressure so the spray stops working
Heating raises the gas pressure until the can could burst
Heating makes the gas particles bigger so they leak out
28.
Each gas is paired with a test result. Which pairing is correct?
Hydrogen – limewater turns milky
Oxygen – a glowing splint bursts into flame
Carbon dioxide – a lit splint gives a squeaky pop
Chlorine – a glowing splint relights
29.
Each gas is paired with a use. Which pairing is correct?
Chlorine – filling balloons for children's parties
Nitrogen – helping patients breathe in hospital
Carbon dioxide – a fuel that burns with a squeaky pop
Helium – filling airships, as it is light and unreactive
30.
Each observation is paired with a particle explanation. Which pairing is correct?
A gas can be compressed – its particles shrink under force
A heated gas has higher pressure – its particles get heavier
A gas fills any container – particles move in all directions
A smell spreads slowly – its particles stop after each collision
31.
Each gas is paired with its approximate percentage in dry air. Which pairing is correct?
Carbon dioxide – about 0.04%
Oxygen – about 78%
Nitrogen – about 21%
Hydrogen – about 1%
32.
Which term is described as: a gas that relights a glowing splint?
hydrogen
carbon dioxide
limewater
oxygen
33.
Which term is described as: a gas giving a squeaky pop with a lighted splint?
oxygen
carbon dioxide
limewater
hydrogen
34.
Which term is described as: a gas that turns limewater cloudy?
oxygen
hydrogen
limewater
carbon dioxide
35.
Which term is described as: a solution used to test for carbon dioxide?
oxygen
carbon dioxide
limewater
hydrogen
36.
Sam blows gently through a straw into limewater, then pumps the same volume of room air through fresh limewater. His results show that breathed-out air contains a _____ percentage of carbon dioxide than room air.
much lower
much higher
exactly equal
slightly lower
37.
The pressure of a gas in a container is caused by its particles _____ the walls of the container.
colliding with
sticking firmly onto
being absorbed by
slowly growing into
38.
The unreactive gas nitrogen makes up about _____ of the air.
21 percent
0.04 percent
50 percent
78 percent
39.
A sealed syringe of air has a plunger that can move freely. When the syringe is warmed, the volume of the air _____ because the faster particles push the plunger out.
decreases
stays the same
increases
drops to zero
40.
The bar chart shows the composition of dry air. Bar X represents the gas that relights a glowing splint. True or false?
Dr Dabour Hub Academy - figure 7
False – X is nitrogen; the splint gas is bar Y
True – X is the largest bar, so it is oxygen
True – every gas in air relights a splint
False – the splint gas is shown by bar Z
41.
The diagram shows a jar of brown bromine vapour with a jar of air placed on top. Bromine vapour is much denser than air. After 30 minutes both jars are the same pale brown. Ella says: "This happens because bromine rises, as it is lighter than air." True or false?
Dr Dabour Hub Academy - figure 8
True – the brown colour moved upwards, so bromine is lighter
False – random particle movement spreads it both ways
True – denser gases always float to the top of a container
False – the air sank into the bottom jar but bromine did not move
42.
Rosa places identical lit candles under upturned jars of different sizes. She concludes: "Doubling the volume of air roughly doubles the burning time, because a bigger jar holds more oxygen for burning." True or false?
True – the times match and the reason is correct
False – the times show no pattern with jar volume
False – the candle uses up nitrogen, not oxygen
True – but only because bigger jars trap more heat
43.
Nitrogen is used to fill bags of salad because it relights a glowing splint and so keeps the leaves fresh. True or false?
True – nitrogen relights a glowing splint
True – nitrogen is the most reactive gas in air
False – nitrogen is chosen because it is unreactive
False – nitrogen is chosen because it is a fuel
44.
Air contains about 21% oxygen, so a glowing splint pushed into a test tube of ordinary air will burst back into flame. True or false?
True – any gas containing oxygen relights a splint
True – air is the best gas for relighting a splint
False – air contains no oxygen at all
False – it only relights in gas with much more oxygen
45.
When a sealed can of gas is heated, the pressure rises because each gas particle gets larger and pushes on the walls. True or false?
True – heated particles expand and fill more space
False – the particles move faster, not get bigger
True – bigger particles have more mass to press with
False – the pressure falls when a gas is heated
46.
When a smell spreads across a room by diffusion, each particle moves in a straight line directly to the far wall. True or false?
False – particles move randomly and keep colliding
True – particles move from high to low in straight lines
True – particles never collide with air particles
False – smell particles do not move at all
47.
A closed bottle of fizzy drink left in a hot car is more likely to burst than an identical bottle kept in a fridge. True or false?
True – the gas pressure is higher when it is hot
False – cold gas always has the higher pressure
False – temperature has no effect on gas pressure
True – but only because the plastic melts
48.
Maya puts a glowing splint into a jar of an unknown gas and it goes out. She concludes that the gas must be carbon dioxide. True or false?
True – only carbon dioxide puts out a glowing splint
True – a splint going out is the test for carbon dioxide
False – she needs the limewater test to be sure
False – the gas must be oxygen instead
49.
Chlorine can be identified because it bleaches damp litmus paper white. True or false?
False – chlorine turns limewater milky instead
False – chlorine makes a lit splint pop
True – but only if the litmus paper is dry
True – damp litmus is bleached white by chlorine
50.
A sealed syringe of gas is kept at the same temperature while its volume is halved. The gas pressure will fall. True or false?
True – fewer particles are left in the smaller space
False – the pressure rises, as collisions become more frequent
True – the particles slow down in a smaller space
False – the pressure stays exactly the same
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Part of Unit 5: Reactivity — see every lesson and quiz in this unit.
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