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HIA International — Grade 6

Unit 1: Cells and organisms

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Unit 2: States of matter, atoms and compounds

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Unit 3: The Solar System and energy

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Unit 4: Living organisms and classification

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Unit 5: Metals, non-metals, acids and alkalis

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Unit 6: Sound, the Earth and eclipses

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Unit 7: Microorganisms and food webs

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Unit 8: Chemical reactions

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Unit 9: Electricity and circuits

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Quiz

8.2 Neutralisation

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Neutralisation Checkpoint Chemistry quiz: free practice for Cambridge Checkpoint (chemistry). Work through this Neutralisation Checkpoint Chemistry quiz and get instant feedback on every answer. If you get stuck, review the 11.2 Neutralisation lesson. More practice: Cambridge Checkpoint (chemistry) — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 48
  • Passing grade: B+
  • Time limit:
Start Quiz
1.
Which statement best expresses the lesson objective about Neutralisation?
Describe neutralisation as a change to pH 7
The terms burette and decay are always interchangeable
Evidence is unnecessary when studying Neutralisation
Every model is an exact copy of reality
2.
Which practical work belongs to Neutralisation?
Compare metal reactions and use the hydrogen “pop” test safely under supervision
Use observations, precipitates, temperature change and gas tests as evidence of reaction
Plan and evaluate a fair test comparing acids, alkalis or neutralisation reactions
Relate neutralisation to antacids, soil treatment and industrial waste treatment
3.
Yusuf added alkali from a burette to 25 cm³ of dilute acid and measured the pH after each addition. Use the graph to find the volume of alkali that exactly neutralised the acid.
Dr Dabour Hub Academy - figure 1
About 20 cm³ of alkali
About 7 cm³ of alkali
About 30 cm³ of alkali
About 12 cm³ of alkali
4.
A doctor measured the pH of a patient's stomach contents during an hour. The patient took an antacid tablet at 10 minutes. Which conclusion is best supported by the graph?
Dr Dabour Hub Academy - figure 2
The antacid made the stomach contents neutral within 20 minutes
The antacid raised the pH, but the contents stayed acidic the whole time
The antacid made the stomach contents alkaline after 40 minutes
The antacid added acid, because the pH went down after 40 minutes
5.
The diagram shows the equipment Priya used to neutralise an acid. Which label points to the equipment she used to add the alkali in small, controlled amounts?
Dr Dabour Hub Academy - figure 3
The part labelled A
The part labelled B
The part labelled C
The part labelled D
6.
A farmer spread lime on four fields and measured the soil pH before and two months later. Which field was given more lime than it needed?
Dr Dabour Hub Academy - figure 4
Field Q, because its pH is still below 7
Field S, because its pH is exactly 7
Field P, because its pH rose the most
Field R, because its soil became alkaline
7.
Bacteria on teeth make acid from sugar. The graph shows the pH on Daniel's teeth after he ate a sweet snack. For about how long was the pH low enough to damage his tooth enamel?
Dr Dabour Hub Academy - figure 5
About 5 minutes
About 20 minutes
About 50 minutes
About 10 minutes
8.
Joel added alkali 5 cm³ at a time to some acid in an insulated cup and recorded the temperature. At which volume of alkali did the mixture most likely become neutral?
Dr Dabour Hub Academy - figure 6
At 40 cm³, when all the alkali had been added
At 0 cm³, before any alkali was added
At 25 cm³, where the temperature was highest
At 7 cm³, because neutral means pH 7
9.
Grace tested four antacid tablets. She counted how many drops of dilute acid each tablet neutralised (mean of three tests). Which tablet gives the best value, neutralising the most acid for each cent spent?
Soothe tablets
Calmex tablets
Relivo tablets
GastroEase tablets
10.
Wasp venom is alkaline. Using the pH values in the table, which substance should Carlos dab on a wasp sting to neutralise it?
Vinegar, pH 3
Baking soda solution, pH 9
Tap water, pH 7
Soap solution, pH 10
11.
Mr Osei has four colourless solutions, W to Z. Which two should be mixed, in suitable amounts, to make a neutral solution by neutralisation?
Solutions W and X
Solutions Y and Z
Solutions W and Z
Solutions X and Y
12.
A farmer checks whether each field has the right soil pH for its crop. Using the table, which field is paired with the correct action? Which pairing is correct?
East field – add lime to raise the pH
North field – add lime to raise the pH to 7
South field – add acid to lower the pH
West field – add lime to lower the pH
13.
Four patients with indigestion each took one antacid dose. Whose stomach contents ended closest to neutral, and by how much did their pH rise?
Ali – the pH rose by 1.8
Chen – the pH rose by 2.6
Dev – the pH rose by 3.0
Chen – the pH rose by 4.1
14.
Which word equation correctly summarises every neutralisation reaction between an acid and an alkali?
acid + alkali → salt + oxygen
acid + water → alkali + salt
acid + alkali → salt + water
salt + water → acid + alkali
15.
Why does a vegetable grower spread lime on a plot where the soil is too acidic?
Lime is an acid that makes the soil even more acidic
Lime adds water to the soil, which dilutes the acid away
Lime is a fertiliser that has no effect on soil pH
Lime is an alkali that neutralises the soil acids so plants grow better
16.
Bee venom is acidic. Why would rubbing vinegar on a bee sting not help?
Vinegar is also an acid, so it cannot neutralise the acidic venom
Vinegar is an alkali, so it makes the sting more alkaline
Vinegar is neutral, so it reacts too slowly with venom
Vinegar neutralises the venom but makes a harmful gas
17.
Kwame is adding alkali drop by drop to acid with universal indicator. After stirring, the mixture is yellow. What should he do next?
Stop now, because yellow shows the mixture is neutral
Add another drop of alkali, stir and check the colour again
Add a few drops of acid, because yellow means too much alkali
Pour in the rest of the alkali quickly to finish the reaction
18.
Hannah was neutralising acid with alkali, but the universal indicator suddenly turned purple. Which is the best way to still end up with a neutral solution?
Add more alkali until the purple colour fades away
Add more universal indicator until the colour is green
Add acid drop by drop, stirring, until the colour turns green
Heat the mixture so the extra alkali evaporates away
19.
Why is toothpaste usually made slightly alkaline?
To make acid on the teeth so that bacteria are killed
To turn the sugar in food into a salt and water
To make the mouth strongly alkaline all day long
To neutralise acid made by bacteria, which helps protect tooth enamel
20.
A factory produces acidic waste water. Why must the waste be neutralised before it is released into a river?
Acidic water would harm fish and other living things in the river
Neutral water flows faster, so the river will not flood
Acid in the river would turn into salt and make it too salty
Neutralising the waste makes the river water safe to drink
21.
An antacid contains magnesium hydroxide. What does it make when it reacts with hydrochloric acid in the stomach?
Hydrogen gas and oxygen
A salt and water
More hydrochloric acid
An alkali and a new acid
22.
Omar says: "Neutralisation is only a physical change, like dissolving, because nothing new is made." Which reply best evaluates his claim?
He is right: the acid and alkali just mix together like sugar in water
He is right: the pH changes, but pH is not a property of substances
He is wrong: a salt and water are new substances, and the mixture warms up
He is wrong: neutralisation is a physical change only when heat is given out
23.
Zara must make a neutral solution from 20 cm³ of dilute acid and a bottle of dilute alkali. Which plan will work best?
Add 20 cm³ of alkali to the acid, then add indicator to check it is red
Add indicator to the alkali, then pour in all the acid at once and stir
Mix equal volumes of acid and alkali and assume the result is neutral
Add indicator to the acid, then add alkali a drop at a time, stirring, until it turns green
24.
Match each problem with the substance used to neutralise it. Which pairing is correct?
Acidic soil – lemon juice
Bee sting – vinegar
Indigestion – hydrochloric acid
Wasp sting – vinegar
25.
Match the key term to its meaning. Which pairing is correct?
Antacid – a medicine that neutralises excess stomach acid
Salt – the acid used up in neutralisation
Neutral – a solution with pH 1
Lime – an acid added to farm soil
26.
Match each universal indicator colour to what it shows. Which pairing is correct?
Red – pH 7, a neutral solution
Green – pH 7, a neutral solution
Purple – a strongly acidic solution
Yellow – a strongly alkaline solution
27.
Mixing an acid and an alkali is called:
Melting
Evaporation
Neutralisation
Filtration
28.
Omar added sodium hydroxide solution, 1 cm³ at a time, to 20 cm³ of dilute hydrochloric acid and measured the pH after each addition. Use the graph to find the volume of alkali that had been added when the mixture was exactly neutral.
Dr Dabour Hub Academy - figure 7
7 cm³ of alkali
20 cm³ of alkali
14 cm³ of alkali
10 cm³ of alkali
29.
Jonas added the same dilute alkali, drop by drop, to 5 cm³ of four sour liquids until each was neutral. Which liquid contained the most acid?
Lemon juice
White vinegar
Malt vinegar
Apple juice
30.
A class tested four indigestion tablets (bases) by finding how much dilute hydrochloric acid each tablet could neutralise. Which tablet neutralises the most acid for each gram of tablet?
Tablet A
Tablet B
Tablet C
Tablet D
31.
Which term is described as: a substance that neutralises an acid, such as a metal oxide, hydroxide or carbonate?
base
excess
end point
neutralisation
32.
Which term is described as: the compound formed when the hydrogen of an acid is replaced by a metal?
concentration
salt
pH scale
neutralisation
33.
Nadia added alkali in 5-drop steps to acid containing universal indicator and recorded the colour each time. The mixture first became neutral after _____ of alkali had been added.
15 drops
35 drops
only 7 drops
20 drops
34.
The pain and burning feeling caused by too much stomach acid is called _____.
indigestion
neutralisation
tooth decay
fermentation
35.
When an acid is exactly neutralised by an alkali, the pH of the solution becomes _____.
pH 1, strongly acidic
pH 7, neutral
pH 14, strongly alkaline
pH 0, the lowest value
36.
As Mei added alkali, her acid-and-indicator mixture changed from red to orange to yellow. This shows the pH was _____.
falling towards 1
already at 7
rising towards 7
above 7 all the time
37.
Tobi took a sample of her acid-and-indicator mixture after every 10 drops of alkali (tubes A to E). Statement: tube E shows that she added too much alkali, so the mixture is no longer neutral. True or false?
Dr Dabour Hub Academy - figure 8
True – blue shows the pH has gone above 7
False – blue shows the mixture is still acidic
False – every tube from C onwards is neutral
True, but only because the indicator has stopped working
38.
A factory adds lime to its acidic waste water in two tanks before the water reaches the river. Statement: the water leaving tank 2 is more acidic than the water entering tank 1. True or false?
True – the pH number went up, so it is more acidic
False – the pH rose from 3.2 to 6.9, so it became less acidic
True, but only because lime is an acid
False – the water was never acidic at any point
39.
Once a mixture of acid and alkali reaches pH 7, adding more alkali will keep it neutral. True or false?
True – pH 7 cannot change after it is reached
True, but only if the mixture is stirred
False – extra alkali makes the solution alkaline
False – extra alkali makes it acidic again
40.
Neutralisation is a chemical reaction that produces a salt and water. True or false?
False – it produces a salt and a gas
False – it is only a physical change
True, but only when the salt is table salt
True – the statement is correct
41.
A wasp sting and a bee sting can both be treated with baking soda, because both venoms need to be neutralised. True or false?
False – wasp venom is alkaline and needs an acid such as vinegar
True – baking soda neutralises every kind of venom
True, but only if a lot of baking soda is used
False – bee venom is alkaline and needs vinegar
42.
Lina's plants grow badly in soil of pH 4.5. She claims that adding lime will lower the soil pH and help her plants. True or false?
True – lime lowers the pH of acidic soil
False – lime will help, but it raises the pH towards 7
True, because lower pH is better for all plants
False – lime has no effect on the soil pH
43.
If universal indicator is green in a mixture of acid and alkali, the mixture is neutral. True or false?
False – green shows a strong acid
False – green shows a strong alkali
True – green shows pH 7
True, but only if the mixture is hot
44.
An antacid tablet works by adding more acid to the stomach to cancel out the stomach acid. True or false?
True – two acids cancel each other out
True, but only for mild indigestion
False – an antacid simply dilutes the acid with water
False – an antacid is a base that neutralises the acid
45.
Sam's mixture of acid and alkali warmed from 20 °C to 24 °C. Statement: this temperature rise supports the idea that a chemical reaction happened. True or false?
True – a temperature change is a sign of a chemical reaction
False – a temperature change always means a physical change
False – the thermometer must be faulty
True, but only if the mixture also fizzes
46.
Alkaline toothpaste helps protect teeth because it neutralises the acid made by bacteria. True or false?
False – toothpaste adds acid to kill the bacteria
True – the statement is correct
False – bacteria make alkalis, not acids
True, but only if the toothpaste is acidic
47.
A solution with pH 7 contains neither leftover acid nor leftover alkali. True or false?
False – pH 7 is a weak acid
False – pH 7 is a weak alkali
True – pH 7 is neutral
True, but only for pure water
48.
Hana adds exactly enough lime to bring acidic soil from pH 5 to pH 7. Statement: the soil is now alkaline. True or false?
True – anything treated with lime is alkaline
True, because the pH number increased
False – the soil is still acidic at pH 7
False – at pH 7 the soil is neutral
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Part of Unit 8: Chemical reactions — see every lesson and quiz in this unit.
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