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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

8.4 Reactions Of Metals With Water

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Reactions Of Metals With Water Checkpoint Chemistry quiz: free practice for Cambridge Checkpoint (chemistry). Work through this Reactions Of Metals With Water Checkpoint Chemistry quiz and get instant feedback on every answer. If you get stuck, review the 13.4 Reactions of metals with water lesson. More practice: Cambridge Checkpoint (chemistry) — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 46
  • Passing grade: B+
  • Time limit:
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1.
Which statement correctly describes metal hydroxide?
the corrosion of iron, needing both oxygen and water
the compound formed when a reactive metal reacts with water
the gas given off when a metal reacts with water or acid
the test for hydrogen, using a lit splint
2.
Sodium reacts with water to produce sodium hydroxide and:
Chlorine
Hydrogen
Oxygen
Carbon dioxide
3.
Tanvir collected the gas made when calcium reacts with water, using the apparatus shown. How should he test the gas to show what it is?
Dr Dabour Hub Academy - figure 1
Hold a lighted splint at the mouth of the tube and listen for a squeaky pop
Put a glowing splint into the tube and see if it relights brightly
Bubble the gas through limewater and look for it turning milky
Hold damp blue litmus paper in the tube and see if it turns red
4.
Mei put 0.1 g of calcium and 0.1 g of magnesium ribbon into separate flasks of cold water and collected the hydrogen. Her results are on the graph. Which conclusion do the results support?
Dr Dabour Hub Academy - figure 2
Magnesium does not react with water under any conditions at all
Calcium stops reacting after 6 minutes because the water becomes acidic
Calcium reacts much faster with cold water than magnesium does
Both metals react at the same rate once they have been in water for 10 minutes
5.
Dalia uses the apparatus shown to react magnesium with water. Why does she heat the wet mineral wool as well as the magnesium?
Dr Dabour Hub Academy - figure 3
To dry the mineral wool so that no water reaches the magnesium
To turn the water into steam, which passes over the hot magnesium
To make oxygen from the water, which the magnesium burns in
To keep the boiling tube from cracking while the magnesium melts
6.
Nadia drew and labelled what she saw when her teacher added a small piece of potassium to a trough of water. Which of her labels, A to D, is wrong?
Dr Dabour Hub Academy - figure 4
Label A, because potassium burns with a green flame
Label B, because potassium stays solid in water
Label C, because potassium stays still in one place
Label D, the sinking metal
7.
Joel added equal small masses of potassium, sodium and calcium to separate beakers containing 100 cm³ of water, and recorded the temperature. The graph shows his results, with the metals labelled L, M and N. Which metal is L?
Dr Dabour Hub Academy - figure 5
Potassium
Calcium, because it fizzes steadily
Sodium, because it is in the middle of the three
It cannot be known without a pH test
8.
Beakers X, Y and Z in the diagram each contain cold water and one of these metals: potassium, calcium or copper. Each option pairs a beaker with a metal. Which pairing is correct?
Dr Dabour Hub Academy - figure 6
Beaker X – copper
Beaker Y – calcium
Beaker Z – potassium
Beaker Y – potassium
9.
Arjun recorded how four unnamed metals, E to H, behaved with cold water and with steam. Which metal is most likely to be magnesium?
Metal E, because it makes an alkaline solution
Metal G, because it is safe with steam
Metal F only
Metal H, because it melts during the reaction
10.
Sofia measured the hydrogen made by different masses of calcium in water. One result does not fit the pattern. What is the most likely cause?
For 0.15 g, some gas escaped before the tube was in place
For 0.20 g, the calcium reacted with oxygen instead of water
For 0.05 g, the calcium was too small to make any hydrogen
For 0.25 g, the water ran out so the volume was too large
11.
A class left 0.10 g samples of five metals in cold water for one hour and then weighed what was left. Which statement is best supported by the table?
Magnesium does not react with cold water, just like copper
Calcium reacts faster than sodium because some calcium is left
Copper reacts slowly, because it lost a tiny amount of mass
Magnesium reacts with cold water, but only very slowly
12.
Beatriz concluded from her table that magnesium does not make hydrogen when it reacts with water. Which is the best evaluation of her conclusion?
It is not valid; there was too little gas for the test to work
It is valid, because magnesium makes oxygen with water instead
It is valid, because the splint test is reliable for any volume
It is not valid, because she should have used a glowing splint
13.
Musa used the table to claim that sodium is more reactive than potassium. Why is this comparison not valid?
Potassium was given a larger mass than sodium, so it should have warmed more
Temperature rise cannot tell us anything about how reactive a metal is
Potassium was added to twice the volume of water, so the heat was spread out more
Calcium should have been left out because it does not react with water
14.
Which word equation shows the reaction of calcium with cold water?
calcium + water → calcium oxide + oxygen
calcium + water → calcium chloride + hydrogen
calcium + hydrogen → calcium hydroxide + water
calcium + water → calcium hydroxide + hydrogen
15.
After sodium has reacted with water, a few drops of universal indicator turn the solution purple. What does this show?
The solution is acidic because hydrogen has dissolved in it
The solution is alkaline because sodium hydroxide has formed
The solution is neutral because the sodium has all been used up
The indicator has reacted with the leftover sodium metal
16.
Hiro drops a clean piece of zinc into a beaker of cold water and watches for five minutes. What does he most likely see?
Steady fizzing and the zinc slowly dissolving
A lilac flame and the zinc moving over the surface
No visible reaction
The zinc melting into a ball as the water gets hot
17.
When a small piece of sodium is put on water, it whizzes around on the surface. What causes this movement?
Bubbles of hydrogen gas forming under it push it along
Oxygen escaping from the sodium pushes it like a rocket
The water boils underneath it and the steam lifts it up
The sodium is attracted to the sides of the trough
18.
Ms Kaur lets students add calcium to water themselves, but only she adds potassium, from behind a screen. Which is the best justification?
Calcium does not react with water at all, so it is completely safe
Potassium makes an acid that burns skin, but calcium makes pure water
Only potassium makes hydrogen, which is the only dangerous product
Potassium reacts so violently it can catch fire and spit; calcium fizzes steadily
19.
An iron nail left in cold water gives no bubbles of gas, although the nail slowly rusts. Which explanation fits the reactivity series?
Iron is too reactive, so it forms a coating that stops all gas escaping
Iron is not reactive enough to make hydrogen with cold water; it reacts only slowly with steam
Iron reacts with cold water to form oxygen, which stays dissolved
Iron is less reactive than copper, so it cannot react with water
20.
Lina wants to find out whether calcium or magnesium reacts faster with cold water. Which plan would give valid results?
Use a large lump of magnesium and a small granule of calcium so both react for a similar time
Put both metals into the same beaker of water and count all of the bubbles together
Use equal masses in equal volumes of water and measure the hydrogen collected in the same time
Add each metal to water at a different temperature and write down which looks faster
21.
A metal shows no reaction with cold water, but when heated in steam it forms a white oxide and hydrogen. Which metal could it be?
Zinc metal
Sodium, which darts about on water
Copper, which has no reaction with steam
Gold, which is found as a pure metal
22.
Magnesium hardly reacts with cold water, yet it burns brightly when heated in steam. What is the best explanation?
Steam contains oxygen gas, while cold water contains no oxygen at all
Cold water forms a hydroxide coat, but steam changes magnesium to copper
Magnesium only reacts with gases and never with any liquid
Steam is far hotter, so the reaction gains enough energy to go quickly
23.
Oscar says: "Copper is used for hot water pipes because it is one of the most reactive metals." Which is the best evaluation?
Correct: reactive metals conduct heat so they warm the water quickly
Wrong: copper is chosen because it does not react with water or steam
Correct: copper reacts with water to form a protective copper hydroxide
Wrong: copper is used because it reacts with water only when it is cold
24.
Each option pairs a key term with a meaning. Which pairing is correct?
Steam – cold liquid water that reacts with every metal
Metal hydroxide – the gas made when metals react with water
Alkaline solution – turns universal indicator blue or purple
Tarnish – the bright shine on a freshly cut metal surface
25.
Each option pairs a metal with how it reacts with cold water. Which pairing is correct?
Calcium – fizzes steadily, giving off hydrogen
Copper – fizzes violently with a lilac flame
Potassium – no reaction, even after a day
Magnesium – explodes as soon as it touches water
26.
Each option pairs an observation with what it tells you about a metal reacting with water. Which pairing is correct?
Indicator turns purple – an acid was made
Metal melts into a ball – the reaction takes in heat
Metal sinks and nothing happens – a very reactive metal
Lighted splint pops – hydrogen was made
27.
Which metal reacts most vigorously with water?
Copper
Gold
Potassium
Iron
28.
Match the term to its correct meaning: squeaky pop test
the corrosion of iron, needing both oxygen and water
the test for hydrogen, using a lit splint
the compound formed when a metal reacts with oxygen
the gas given off when a metal reacts with water or acid
29.
Use the pattern in the table. The missing product X is _____.
zinc hydroxide
zinc sulfate
zinc and oxygen gas
zinc oxide
30.
To test for hydrogen, a lighted splint is held at the mouth of the tube. If hydrogen is present there is a _____.
glowing relight
milky white cloud
squeaky pop
bright green flash
31.
potassium + water → _____ + hydrogen
potassium oxide
potassium hydroxide
potassium chloride
potassium carbonate
32.
Magnesium reacts only very slowly with cold water, but it reacts quickly with _____.
ice at 0 °C
paraffin oil
cold salt water
steam at over 100 °C
33.
Copper does not react with cold water. - True or false?
True
False
34.
A reactive metal reacting with water forms a metal hydroxide and hydrogen. - True or false?
True
False
35.
Calcium reacts with cold water more vigorously than sodium. - True or false?
True
False
36.
The diagram shows how Mr Haddad demonstrates sodium reacting with water. Statement: "The screen and the tiny piece of sodium are only needed because sodium is poisonous to touch; the reaction itself is gentle." True or false?
Dr Dabour Hub Academy - figure 7
True – sodium only fizzes gently, so the screen is just for show
True, but only when the water in the trough is warm
False – the reaction is violent and can spit hot material
False – the screen is there to collect the hydrogen for testing
37.
Kofi added universal indicator to three tubes of water after leaving a different metal in each. Statement: "Tube 3 stayed green because copper formed copper hydroxide, which is a neutral substance." True or false?
True – every metal hydroxide solution gives a neutral green colour
False – copper did not react, so the water stayed neutral
True, but only because the copper was left in for too short a time
False – tube 3 shows that copper made an acidic solution
38.
The liquid left after calcium has reacted with water is alkaline. True or false?
True – it contains calcium hydroxide
False – it is acidic because hydrogen was made
False – it is neutral because calcium is a metal
True, but only if the water was warmed before the reaction
39.
Magnesium ribbon reacts faster with cold water than the same mass of calcium does. True or false?
True – magnesium burns more brightly, so it reacts faster with water too
True, but only when the magnesium ribbon has been cleaned first
False – neither metal reacts with cold water at all
False – calcium is higher in the series and reacts faster
40.
If equal small pieces of potassium and sodium are dropped into water, potassium will react more violently. True or false?
True – potassium is above sodium in the series
False – sodium is larger so it always reacts more violently
False – both react at exactly the same rate as they are both soft
True, but only because potassium is heavier and sinks
41.
When magnesium reacts with steam, the products are magnesium hydroxide and hydrogen. True or false?
True – metals always form a hydroxide with any form of water
False – steam gives magnesium oxide, not hydroxide
True, but only when the steam is above 200 °C
False – the products are magnesium oxide and oxygen
42.
Sodium and potassium are kept in bottles under oil so that air and water cannot reach them. True or false?
False – they are kept under oil to stop them evaporating
False – oil makes them more reactive, ready for use in class
True, but only sodium; potassium is kept in a jar of water
True – they react quickly with both air and water
43.
The more reactive a metal is, the more heat is given out when it reacts with water. True or false?
True – potassium gives out so much heat that it melts
False – less reactive metals give out more heat as they react for longer
False – reactions of metals with water take in heat from the surroundings
True, but only for metals that sink to the bottom
44.
Anil says: "When potassium reacts with water it forms a metal hydroxide, so the liquid left behind becomes acidic." True or false?
True – all reactions that make hydrogen leave an acid behind
True, but only until the hydrogen has escaped from the water
False – metal hydroxide solutions are alkaline
False – the solution is neutral because potassium hydroxide is a salt
45.
The hydrogen made when calcium reacts with water can be identified because it relights a glowing splint. True or false?
True – hydrogen is the only gas that relights a glowing splint
False – hydrogen pops with a lighted splint
True, but only if a lot of hydrogen has been collected
False – hydrogen puts out a lighted splint silently
46.
Iron reacts slowly with steam to form iron oxide and hydrogen, but copper does not react with steam. This shows iron is more reactive than copper. True or false?
False – copper is more reactive because it stays shiny in steam
False – a reaction with steam cannot be used to compare metals
True, but only because iron is magnetic and copper is not
True – iron reacts and copper does not
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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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