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Course: HIA International — Grade 6
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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

5.5 Acids And Alkalis

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Acids And Alkalis Checkpoint Chemistry quiz: free practice for Cambridge Checkpoint (chemistry). Work through this Acids And Alkalis Checkpoint Chemistry quiz and get instant feedback on every answer. If you get stuck, review the 10.5 Acids and alkalis lesson. More practice: Cambridge Checkpoint (chemistry) — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 38
  • Passing grade: B+
  • Time limit:
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1.
Which statement best expresses the lesson objective about Acids and alkalis?
Identify properties of acids and alkalis
The terms acid and alkalis are always interchangeable
Evidence is unnecessary when studying Acids and alkalis
Every model is an exact copy of reality
2.
Which practical work belongs to Acids And Alkalis?
Link material properties to uses such as wires, tools, containers and construction
Compare pure metals with alloys and connect composition to material properties
Compare samples using fair tests for appearance, conductivity, hardness and malleability
Handle dilute laboratory chemicals safely and match hazards to appropriate precautions
3.
A weak acid has a pH nearer to 7 than a strong acid does. - True or false?
True
False
4.
An alkali is a base that dissolves in water. - True or false?
True
False
5.
The diagram shows where five solutions, A to E, lie on the pH scale. Which pair of solutions would both turn red litmus blue, and which one of that pair should be labelled corrosive?
Dr Dabour Hub Academy - figure 1
D and E; E is the corrosive one
A and B; A is the corrosive one
C and D; D is the corrosive one
D and E; D is the corrosive one
6.
Leila measured the pH of six household liquids. Her results are shown in the bar chart. How many of the six liquids are alkalis?
Dr Dabour Hub Academy - figure 2
Two of the liquids
Three of the liquids
Four of the liquids
Five of the liquids
7.
The diagram shows four hazard symbols, P, Q, R and S. Which symbol should be printed on a bottle of concentrated sulfuric acid?
Dr Dabour Hub Academy - figure 3
Symbol P
Symbol Q
Symbol R
Symbol S
8.
Sofia dipped a red and a blue litmus paper into each of four liquids. The diagram shows the colour of each paper afterwards. Which beaker contains the salt solution?
Dr Dabour Hub Academy - figure 4
Beaker W
Beaker X
Beaker Y
Beaker Z
9.
Amira measured the pH of five substances and sorted them into groups. Which of her groupings is wrong?
Car battery acid
Lemonade drink
Drain cleaner
Hand soap
10.
Chen is about to light a Bunsen burner on the bench. Four bottles on the bench carry the hazard warnings in the table. Which bottle is most important to move well away from the flame?
The ethanol bottle
The dilute sodium hydroxide bottle
The concentrated hydrochloric acid bottle
The distilled water bottle
11.
Using the table, Priya says: "All the drinks except mineral water are acidic, and black coffee is a stronger acid than orange juice." True or false?
True – the statement is correct
True, because coffee tastes more bitter
False – coffee is the weaker acid
False – milk is an alkali
12.
Twenty volunteers each washed their hands with one soap for a week. The table shows how many reported dry, itchy skin. Which conclusion is best supported?
Only acidic soaps irritate the skin
Soaps with a higher pH made more volunteers' skin itchy
Every soap with a pH above 7 is corrosive
Soap pH made no difference to the skin
13.
Rashid says he can tell whether a clear liquid in the lab is an acid by tasting one tiny drop, because acids taste sour. Why does the teacher stop him?
Acids only taste sour when they are warm
Tasting would neutralise the acid
Acids have no taste at all
It could be corrosive and damage his mouth
14.
During a practical, a few drops of dilute acid splash onto Kiri's hand. What should she do first?
Wash it with plenty of cold running water
Wipe it with a dry paper towel and carry on
Rub oven cleaner on it to neutralise it
Wait to see if the skin turns red
15.
Copper oxide is a black powder. It neutralises dilute sulfuric acid, but it does not dissolve in water. Which statement correctly describes copper oxide?
An alkali, but not a base
A base, but not an alkali
A weak acid
A neutral substance
16.
Farmer Adeyemi finds his field soil has pH 5, but his beans grow best at about pH 7. What should he add to the soil?
Powdered lime, a base
Vinegar, a weak acid
Lemon juice waste
Extra rainwater only
17.
Which description of an oven cleaner with pH 13.5 is the most accurate?
A strong acid that is corrosive to skin
A weak alkali that is safe because it feels soapy
A strong alkali that is corrosive to skin
A neutral cleaner, as it cleans without reacting
18.
Which of these everyday substances is a weak acid?
Toothpaste from a tube
Pure distilled water
Liquid hand soap
Orange juice from a carton
19.
Hana slowly added dilute alkali to dilute acid. She stopped when a pH meter read exactly 7.0. What does this reading tell her?
The mixture is now a strong alkali
She has added too little alkali
The acid and alkali have neutralised each other
The mixture is still a weak acid
20.
Four liquids have these pH values: bleach 12.5, black tea 5.5, stomach acid 1.5, sea water 8.0. Which list puts them in order from most acidic to most alkaline?
Bleach, sea water, black tea, stomach acid
Stomach acid, black tea, sea water, bleach
Black tea, stomach acid, sea water, bleach
Stomach acid, sea water, black tea, bleach
21.
Every acid is dangerous and corrosive. True or false?
True – the statement is correct
False – weak acids are found in foods
True, but only when it is heated
True, because all acids have pH 0
22.
A solution with pH 12 is more strongly alkaline than a solution with pH 9. True or false?
True – the statement is correct
False – the statement is wrong
False – pH 9 is further from 0
False – both have exactly equal strength
23.
Mia says: "Strong alkalis are safer to handle than strong acids, because alkalis feel soapy instead of burning." True or false?
True – the statement is correct
True, but only for sodium hydroxide
True, because alkalis have high pH
False – strong alkalis are corrosive too
24.
Pure water and salt solution are both neutral, with a pH of 7. True or false?
False – the statement is wrong
False – salt solution is an alkali
True – the statement is correct
False – pure water is a weak acid
25.
Goggles only need to be worn when heating chemicals, not when pouring dilute acids and alkalis. True or false?
False – wear goggles whenever handling them
True – the statement is correct
True, as dilute solutions cannot splash
True, but only for dilute alkalis
26.
Any substance that neutralises an acid must be an alkali. True or false?
True – the statement is correct
False – insoluble bases also neutralise acids
True, because alkalis are the only bases
True, but only for acids with pH 1
27.
Vinegar with pH 3 is less acidic than lemon juice with pH 2. True or false?
False – the statement is wrong
False – a higher pH means more acidic
False – vinegar and lemon are equal
True – the statement is correct
28.
The pH scale runs from 0 to 14, with acids at the low-number end. True or false?
True – the statement is correct
False – the statement is wrong
False – acids are at the high end
False – the scale runs from 1 to 10
29.
Leo tested an unlabelled liquid. It was colourless and had no smell, so he decided it must be water and safe to touch. True or false?
True – the statement is correct
True, as acids always have a smell
False – many acids and alkalis look like water
True, as alkalis are always coloured
30.
Toothpaste, which has a pH of about 9, is a weak alkali. True or false?
False – the statement is wrong
False – it is a weak acid
False – it is a strong alkali
True – the statement is correct
31.
A substance that can destroy living tissue, such as skin, as well as other materials, is described as _____.
flammable substance
corrosive substance
neutral substance
soluble substance
32.
A warning picture on a bottle that shows what kind of danger the chemical has is called a _____.
pH scale chart
litmus indicator
neutral label
hazard symbol
33.
Hydrochloric acid and sulfuric acid in the lab can have pH values between 0 and 3, so they are _____.
strong acids
weak acids
weak alkalis
strong alkalis
34.
Blue litmus paper stays blue and red litmus paper stays red in a solution of pH 7, because the solution is _____.
a strong acid
a weak alkali
neutral, neither acid nor alkali
a corrosive base
35.
Each hazard word is paired with a meaning. Which pairing is correct?
Flammable – catches fire easily
Oxidising – feels soapy on skin
Corrosive – catches fire easily
Irritant – has pH exactly 7
36.
Each pH range is paired with a type of solution. Which pairing is correct?
pH 4–6 – weak alkali
pH 8–10 – strong acid
pH 11–14 – strong alkali
pH 0–3 – neutral
37.
Each lab substance is paired with a type. Which pairing is correct?
Ethanoic acid – strong alkali
Distilled water – weak acid
Hydrochloric acid – weak alkali
Sodium hydroxide – strong alkali
38.
Each hazard is paired with a lab precaution. Which pairing is correct?
Flammable – heat it over a Bunsen flame
Corrosive – wear goggles and gloves
Corrosive – sniff it closely to identify it
Irritant – no precautions are needed
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Part of Unit 5: Metals, non-metals, acids and alkalis — see every lesson and quiz in this unit.
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