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HIA International — Grade 7

Unit 1: Breathing and respiration

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Unit 2: Dissolving, solubility and chromatography

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Unit 3: Forces, motion and pressure

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Unit 4: Ecosystems

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Unit 5: Atoms, purity and climate

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Unit 6: Light and objects in space

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Unit 7: Nutrition, health and movement

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Unit 8: Energy changes and reactions of metals

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Unit 9: Magnetism and electromagnets

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Quiz

8.3 Metals And Their Reactions With Oxygen

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Metals And Their Reactions With Oxygen Checkpoint Chemistry quiz: free practice for Cambridge Checkpoint (chemistry). Work through this Metals And Their Reactions With Oxygen Checkpoint Chemistry quiz and get instant feedback on every answer. If you get stuck, review the 13.3 Metals and their reactions with oxygen 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.
Zanele pushed damp iron wool to the top of a test tube and stood it upside down in water, as shown. After a week the iron wool had turned orange-brown and the water level inside the tube had risen. Which is the best explanation for the rise?
Dr Dabour Hub Academy - figure 1
The iron wool soaked up water and pulled it up the tube like a sponge
The iron reacted with oxygen from the trapped air, so that gas was used up
The water in the trough evaporated and condensed inside the tube
Nitrogen from the air dissolved into the iron to make a nitride
2.
A council paints the iron railings along a sea front every few years. How does the paint stop the railings from rusting?
It makes the iron less reactive by changing it into gold
It reacts with the rust and turns it back into shiny iron
It absorbs heat so the iron is too cold to react
It keeps oxygen and water away from the iron surface
3.
Ines heats magnesium ribbon in a covered crucible, set up as in the diagram. Her teacher tells her to lift the lid slightly with tongs from time to time, then put it back. Why?
Dr Dabour Hub Academy - figure 2
To let the hydrogen gas made by the reaction escape safely from the crucible
To let fresh air in for the magnesium to react with, while keeping the solid product inside
To let the crucible cool so that the magnesium does not melt
To check that the magnesium has turned into black copper oxide
4.
Pedro tested ways of protecting iron. Which conclusion is best supported by his table?
A coating protects iron only where it stays unbroken over the metal
Paint causes rust because plate 3 went rusty along its scratch
Oiling gives the best protection because it does not need to be renewed
Iron does not need protection outdoors because plate 2 did not rust
5.
Yusuf wrote word equations for four metals reacting with oxygen. Which row contains a mistake?
Row 1, because zinc does not react with oxygen
Row 2, because copper is too unreactive to form an oxide
Row 3, the iron equation
Row 4, because calcium forms calcium hydroxide instead
6.
Each option pairs an observation with the process it shows. Which pairing is correct?
An iron nail turns orange-brown – displacement
Magnesium burns to a white powder – oxidation
Copper turns black when heated – reduction of copper
Gold stays shiny for centuries – rusting
7.
When burning magnesium ribbon in class, students are told to look at the flame only through a blue glass or filter, never directly. What is the main reason?
The flame gives off hydrogen that can explode near the face
The white light is bright enough to damage the eyes
The magnesium oxide powder is poisonous if seen without glass
Looking at it would slow the reaction down and spoil the results
8.
Iron reacts slowly with water and oxygen to form:
Iron sulfide
Rust
Iron chloride
Hydrogen only
9.
Chen wants to compare how vigorously iron, zinc and copper react with oxygen. Which plan would give a fair comparison?
Heat a lump of iron, zinc powder and a sheet of copper foil for as long as each needs
Hold each metal in a different flame colour so that the results are easier to see
Sprinkle equal masses of each metal powder into the same Bunsen flame and compare what is seen
Heat only the copper, because iron and zinc are known to react with water instead
10.
Farah set up the four test tubes shown, each with an iron nail, and left them for one week. In which tube or tubes will the nail rust?
Dr Dabour Hub Academy - figure 3
Tubes A and D, because both contain tap water and air
Tubes A and B, because both nails are covered by water
All four tubes, because iron always rusts in a week
Only tube A
11.
Gold nuggets can be dug out of the ground as the shiny, pure metal, but iron is always found combined with other elements. Why?
Gold is so unreactive that it does not combine with oxygen or water
Gold is heavier than iron so oxygen cannot reach it underground
Gold reacts with oxygen but the oxide changes back straight away
Iron is less reactive than gold so it needs other elements to hold it
12.
An engineer needs a metal to coat the electrical contacts in a satellite. The contacts must stay free of any oxide layer for 20 years. Which choice is best, and why?
Gold, because it does not react with oxygen
Iron, because it is cheap and strong enough to last in space
Magnesium, because it burns brightly and so conducts well
Sodium, because it is a soft metal that is easy to spread thinly
13.
A technician heated small samples of sodium, magnesium, copper and gold and recorded what she saw, without naming the metals. Which order, from most reactive to least reactive, fits her observations?
A, C, B, D (white light is the most reactive)
C, A, B, D
D, B, A, C (no change means most stable)
C, B, A, D (a glow beats a flame)
14.
Lucia recorded the masses in the table. What mass of oxygen combined with the magnesium?
0.24 g of oxygen
0.40 g of oxygen
0.16 g of oxygen
24.90 g of oxygen
15.
Kwame heated 0.36 g of magnesium ribbon in a crucible and weighed the solid every minute. The graph shows his results. Why does the mass stop changing after 5 minutes?
Dr Dabour Hub Academy - figure 4
All of the magnesium has reacted, so no more oxygen can combine with it
The oxygen in the whole laboratory has been used up by the reaction
The magnesium oxide starts to lose oxygen again as fast as it gains it
The balance has reached its maximum reading and cannot go higher
16.
Amira sprinkles iron filings into a hot Bunsen flame and sees bright orange sparks. Which substance forms in the sparks?
Iron hydroxide formed from water in the flame
Hydrogen gas released from inside the iron
Iron oxide
Pure iron that has melted and cooled again
17.
Magnesium burns in oxygen to form:
Magnesium chloride
Magnesium hydroxide
Magnesium oxide
Magnesium carbonate
18.
Each option pairs a key term with a meaning. Which pairing is correct?
Corrosion – slow reaction of a metal with air and water
Oxidation – the loss of oxygen from a substance
Displacement – a metal reacting with oxygen to form an oxide
Metal oxide – the gas given off when a metal is heated
19.
Each option pairs a metal with what is seen when it is heated in air. Which pairing is correct?
Gold – burns with a dazzling white flame
Magnesium – no visible change at all
Sodium – turns green and stays completely cold
Copper – a black coating forms on the surface
20.
Zinc powder sprinkled into a Bunsen flame burns. Which word equation shows this reaction?
zinc + oxygen → zinc hydroxide
zinc + air → zinc + carbon dioxide
zinc oxide → zinc + oxygen
zinc + oxygen → zinc oxide
21.
Ravi says: "Iron rusting on a gate and magnesium burning in a flame are really the same kind of reaction." Which evaluation of his claim is correct?
Wrong: rusting makes a hydroxide gas, while burning makes an oxide solid
Partly right: both make an oxide, but rusting is slow and also needs water
Wrong: only burning uses oxygen; rusting uses nitrogen from the air
Completely right: both happen quickly and both need only a flame
22.
The particle diagram shows what happens when magnesium is heated in air. Using the diagram, which statement explains why the solid weighs more after heating?
Dr Dabour Hub Academy - figure 5
The magnesium atoms have grown bigger because they were heated
Extra magnesium atoms have been made by the heat of the flame
The oxygen atoms have turned into magnesium atoms in the flame
Oxygen atoms from the air have joined the magnesium atoms in the solid
23.
Five groups each heated 0.12 g of magnesium ribbon in a crucible. Which is the most likely reason for the anomalous result?
Group 3 lifted the lid too often and white oxide smoke escaped
Group 2 heated for too long so extra magnesium formed
Group 3 did not heat long enough for any oxygen to combine at all
Groups 1, 4 and 5 all misread the balance by the same amount
24.
Each option pairs an iron or steel object with a way of preventing rust. Which pairing is correct?
Moving bicycle chain – thick gloss paint
Iron nail in a toolbox – soaking in water
Steel lamp post outdoors – painting
Sliding door runner – coating with dry sand
25.
A teacher wrote this method for showing that magnesium burns with a bright white light. Which step is unsafe and should be changed?
Step 1 of the method
Step 2 of the method
Step 3 of the method
Step 4 of the method
26.
Which term is described as: metals arranged in order of how readily they react?
reactivity series
extraction
reduction with carbon
displacement
27.
Match the term to its correct meaning: native metal
a rock containing enough of a metal compound to be worth extracting
the dull layer that forms on a metal surface as it slowly reacts with air
how readily a metal takes part in chemical reactions
a metal such as gold found uncombined in the ground because it is so unreactive
28.
Which term is described as: a metal found uncombined because it is so unreactive?
extraction
reduction with carbon
native metal
reactivity series
29.
Match the term to its correct meaning: reactivity
how readily a metal takes part in chemical reactions
the gradual attack of a metal surface by air, water or chemicals
a metal such as gold found uncombined in the ground because it is so unreactive
a list of metals arranged in order from most reactive to least reactive
30.
Which term is described as: how readily a metal takes part in chemical reactions?
reactivity
reactivity series
displacement reaction
ore
31.
Coating steel buckets with a thin layer of zinc to stop them rusting is called _____.
displacement
oxidation
tarnishing
galvanising
32.
Freshly cut sodium is shiny, but within seconds it goes dull because it reacts with _____ in the air.
nitrogen gas
carbon dioxide only
oxygen gas
hydrogen gas
33.
A metal burns with a brilliant white flame, and it is less reactive than calcium but more reactive than aluminium. The metal is most likely _____.
magnesium metal
potassium metal
copper metal
gold metal
34.
Aluminium powder burns brightly when sprinkled into a flame. The word equation is: aluminium + oxygen → _____
aluminium hydroxide
aluminium oxide
aluminium + hydrogen
aluminium chloride
35.
An iron key sealed in a jar of completely dry air will rust within a few days. True or false?
True – the oxygen in the jar is enough on its own to rust iron
True, but only if the jar is kept in a warm cupboard
False – iron needs light as well as water and oxygen to rust
False – without water it cannot rust
36.
When magnesium ribbon burns in air, the white powder left behind is a compound made of magnesium and oxygen. True or false?
False – the powder is magnesium hydroxide made with water from the air
False – the powder is ash made of carbon from the ribbon
True – the powder is magnesium oxide
True, but only if the ribbon was cleaned with water first
37.
During a demonstration of burning magnesium, students should look away from the ribbon rather than staring at the bright white light. True or false?
True – the light can damage the eyes
False – the light is too dim to matter
False – magnesium does not give out light
True, but only if the room is dark
38.
Statement: "The reactivity series can be used to predict that calcium will react with oxygen more vigorously than zinc does." True or false?
True – calcium is higher in the series
False – the series only predicts reactions with water, not oxygen
False – zinc is higher than calcium, so zinc reacts faster
True, but only when both metals are in lumps, not powders
39.
Olga oils the iron hinges on her shed door. Statement: "The oiled hinges will rust at the same rate as hinges that were never oiled." True or false?
True – oil contains oxygen so it cannot protect the iron from rust
True, but only if the shed is in a dry desert climate
False – the oil slows rusting
False – oiled hinges will rust faster because oil attracts rainwater
40.
An old gold coin looks dull only because dirt has stuck to it, not because gold has formed an oxide. True or false?
False – gold slowly reacts with oxygen to form a black gold oxide
True – gold does not react with oxygen
False – gold reacts with water in the soil to form gold hydroxide
True, but only if the coin was buried for less than a year
41.
Statement: "Copper is placed below zinc in the reactivity series, which fits the fact that zinc powder can burn in a flame while copper only forms a black coating." True or false?
False – copper is above zinc because its coating is darker
True – the observations match their places
False – burning in a flame shows a metal is less reactive
True, but only because copper is heavier than zinc
42.
Mr Okafor cut four metals and timed how long each fresh, shiny surface took to go dull in air. The results are in the bar chart. Statement: "Metal Z is the most reactive of the four, because it stayed shiny for the longest time." True or false?
Dr Dabour Hub Academy - figure 6
False – W is the most reactive, because it went dull fastest
True – staying shiny longest shows the strongest reaction with air
True, but only if all four metals were cut at the same time of day
False – the chart shows all four metals are equally reactive with air
43.
The reactivity series lists metals from lightest to heaviest. - True or false?
True
False
44.
Divya kept identical pieces of iron wool in sealed boxes of air with different amounts of water vapour. Statement: "The results show that iron can rust in air that contains no water vapour at all." True or false?
True – the iron still gained mass from oxygen in the dry air box
False – the dry box gave no rust
True, but only when the iron wool is kept in the dark
False – the table shows that water vapour slows rusting down
45.
The gradual attack of a metal surface by air or water is called displacement. - True or false?
True
False
46.
Sanjay says: "When any metal is heated in air, its mass goes down, because burning always turns things into ash and smoke." True or false?
False – the metal gains oxygen, so the mass goes up
True – the metal atoms escape as smoke so the solid loses mass
True, but only for metals high in the reactivity series
False – the mass of a metal never changes during a reaction
47.
Potassium is stored under oil partly because it reacts very quickly with oxygen in the air. True or false?
False – it is stored under oil only to stop it melting in the bottle
False – potassium does not react with oxygen, only with acids
True, but only because oil makes potassium less reactive
True – the oil keeps air away from it
48.
Statement: "All rusting is corrosion, but not all corrosion is rusting." True or false?
False – corrosion and rusting mean exactly the same thing for every metal
False – rusting is a fast reaction and corrosion is always a slow one
True, but only because rusting does not need water
True – only iron and steel rust
49.
Silver tarnishes because it slowly reacts with substances in the air. - True or false?
True
False
50.
In chemistry, oxidation describes a reaction in which a substance gains oxygen. True or false?
True – for example iron gains oxygen to form iron oxide
False – oxidation means a substance loses oxygen
False – oxidation only means a substance catches fire
True, but only for gases, never for metals
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Part of Unit 8: Energy changes and reactions of metals — see every lesson and quiz in this unit.
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