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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

5.6 Indicators And The PH Scale

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Indicators And The PH Scale Checkpoint Chemistry quiz: free practice for Cambridge Checkpoint (chemistry). Work through this Indicators And The PH Scale Checkpoint Chemistry quiz and get instant feedback on every answer. If you get stuck, review the 10.6 Indicators and the pH scale 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 best expresses the lesson objective about Indicators and the pH scale?
Identify acids and alkalis using indicators
The terms indicator and litmus are always interchangeable
Evidence is unnecessary when studying Indicators and the pH scale
Every model is an exact copy of reality
2.
Which practical work belongs to Indicators And The PH Scale?
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
Prepare a natural indicator and use universal indicator to estimate pH
3.
Which statement correctly describes litmus?
a mixture of indicators that gives a different colour at each pH
an indicator that is red in acid and blue in alkali
the scale from 0 to 14 that measures how acidic or alkaline a solution is
an instrument that gives a numerical pH reading
4.
Which statement correctly describes pH scale?
an instrument that gives a numerical pH reading
the scale from 0 to 14 that measures how acidic or alkaline a solution is
an indicator that is red in acid and blue in alkali
a mixture of indicators that gives a different colour at each pH
5.
Four solutions were tested with universal indicator. Use the colour chart to decide which tube, P, Q, R or S, contains a weak alkali.
Dr Dabour Hub Academy - figure 1
Test tube P
Test tube Q
Test tube R
Test tube S
6.
Ines put six different liquids in a spotting tile and added red cabbage indicator to each. 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
One of the liquids
7.
A class measured the pH of five samples with universal indicator and with a pH meter. For which sample would the two methods lead to a different conclusion about whether it is acidic, neutral or alkaline?
Dr Dabour Hub Academy - figure 3
Sample A
Sample D
Sample C
Sample E
8.
Tariq uses the key in the diagram to sort liquids. A liquid of pH 4 is tested. Which box does it end in, and what does the key NOT tell Tariq about it?
Dr Dabour Hub Academy - figure 4
Box 1 – but not whether it is a strong or weak acid
Box 2 – but not whether it is a strong or weak alkali
Box 3 – but not whether it is an acid or an alkali
Box 1 – but not whether it is an acid or an alkali
9.
The chart shows the colour of three indicators at each pH. Which indicator could be used to tell a solution of pH 3 apart from a solution of pH 5?
Dr Dabour Hub Academy - figure 5
Litmus paper
Ana's petal extract
Red cabbage indicator
Any one of the three
10.
Keira tested soil from four garden beds by shaking each with water and adding universal indicator. Which list orders the beds from most acidic to most alkaline?
Bed 4, Bed 2, Bed 1, Bed 3
Bed 1, Bed 3, Bed 2, Bed 4
Bed 3, Bed 2, Bed 1, Bed 4
Bed 3, Bed 1, Bed 2, Bed 4
11.
Ben checked his homemade red cabbage indicator using solutions whose pH he already knew. Which conclusion about his indicator is best supported by the table?
It shows acid, neutral or alkali, but cannot tell pH 9 from pH 10
It gives an exact pH, just like a pH meter
It changes colour only in acids
It cannot tell acids from alkalis at all
12.
A swimming pool should be kept between pH 7.2 and 7.8. The pool manager measured five pools with a pH meter. Which pools need acid added to bring their pH down into the safe range?
Pools A and E
Pools B and D
Pool C only
Pools B, C and D
13.
A shampoo bottle claims the pH is 5.5. Nour wants to check whether it really is 5.5 and not 6.0. Using the table, which method should she use?
Blue litmus paper
Universal indicator
Red litmus paper
The pH meter
14.
What does universal indicator show that litmus paper cannot?
Whether a liquid is an acid
How strong the acid or alkali is
Whether a liquid is an alkali
The mass of the liquid tested
15.
A drain cleaner turns universal indicator purple. What is the best description of the drain cleaner?
A strong acid, pH about 1
A neutral liquid, pH 7
A weak alkali, pH about 8
A strong alkali, pH about 13–14
16.
Dev finds it hard to tell some colours apart, such as red and green. Which method would let him measure the pH of his samples most reliably?
Universal indicator with a colour chart
Red cabbage indicator
A pH meter, which shows a number
Beetroot juice indicator
17.
Two liquids both turn blue litmus paper red. How could Lily find out which one is the stronger acid?
Test both with red litmus paper
Test both with universal indicator
Test both again with blue litmus
Compare how clear the liquids look
18.
Before using her homemade beetroot indicator, Aisha tested it in solutions of known pH. Why was this a sensible first step?
To make the beetroot juice stronger
To turn the indicator into litmus
To remove the red colour from it
To make her own colour chart for it
19.
Red cabbage indicator is added to a liquid and turns green. What type of liquid is it?
An alkali
A strong acid
A weak acid
A neutral liquid
20.
Omar tries to find the pH of a dark brown cola using red cabbage indicator, but cannot decide on the colour. What is the best way to improve his measurement?
Add much more indicator to the cola
Use litmus paper to find the exact pH
Use a pH meter, as the cola's colour hides the indicator
Heat the cola until the colour changes
21.
Kalani wants to find out which of five shampoos is closest to neutral. Which plan would give the most reliable answer?
Dip one strip of red litmus paper into each shampoo in turn
Use a pH meter on each, rinsing the probe with distilled water between samples
Add universal indicator to one shampoo and guess the rest from their smell
Test each with blue litmus and choose the one that stays blue
22.
Each indicator is paired with its colour in an alkali. Which pairing is correct?
Red cabbage – green or yellow
Litmus – red
Universal indicator – orange
Red cabbage – red or pink
23.
Each universal indicator colour is paired with a pH. Which pairing is correct?
Yellow – pH 12
Green – pH 7
Purple – pH 2
Red – pH 9
24.
Each piece of equipment is paired with its use when making and testing a natural indicator. Which pairing is correct?
pH meter – changes colour in acid
Colour chart – heats the cabbage
Filter paper – removes plant pieces
Conical flask – measures pH exactly
25.
Each term is paired with a meaning. Which pairing is correct?
Neutral – a solution with pH below 7
Litmus – gives an exact pH number
pH scale – a scale that runs from 1 to 10
Evidence – observations used to support a conclusion
26.
Which term is described as: an indicator that is red in acid and blue in alkali?
litmus
pH scale
indicator
pH meter
27.
Match the term to its correct meaning: indicator
a substance that changes colour to show whether a solution is acidic or alkaline
the scale from 0 to 14 that measures how acidic or alkaline a solution is
an instrument that gives a numerical pH reading
a mixture of indicators that gives a different colour at each pH
28.
An instrument giving a numerical pH reading is a pH _____.
chart
paper
meter
indicator
29.
Litmus is _____ in acid.
blue
purple
green
red
30.
Grace added universal indicator to 10 cm³ of dilute acid and then added alkali, 2 cm³ at a time, noting the colour (see table). The mixture first became neutral when _____ of alkali had been added.
8 cm³ in total
6 cm³ in total
10 cm³ in total
12 cm³ in total
31.
Universal indicator turns _____ in a strong acid of pH 1.
green in colour
red in colour
purple in colour
blue in colour
32.
An indicator made from plants, such as red cabbage or beetroot, is called a _____ indicator.
universal mixed
electronic meter
litmus paper
natural plant-based
33.
A solution that turns universal indicator purple has a pH close to _____.
14 on the scale
7 on the scale
1 on the scale
4 on the scale
34.
The lower the pH, the more acidic the solution. - True or false?
True
False
35.
Litmus gives an exact pH number. - True or false?
True
False
36.
Sara tested a mango juice in two ways, shown in the diagram. She says: "Both tests show the juice is a weak acid, but only the meter tells me its pH is 4.6." True or false?
Dr Dabour Hub Academy - figure 6
False – the statement is wrong
True – the statement is correct
False – the indicator shows it is neutral
False – the meter shows it is an alkali
37.
Hugo tested liquid K four ways (see table). He concludes: "Liquid K is most likely neutral, with a pH of about 7." True or false?
False – the statement is wrong
False – it must be a weak acid
True – the statement is correct
False – it must be a weak alkali
38.
Universal indicator turns green in pure water. True or false?
False – the statement is wrong
False – it turns red in water
False – it turns purple in water
True – the statement is correct
39.
Kwame's river sample turned universal indicator orange and Efua's turned it yellow. Kwame's sample has the lower pH. True or false?
True – the statement is correct
False – the statement is wrong
False – Efua's has the lower pH
False – both are neutral
40.
Blue litmus paper dipped into washing soda solution, which is an alkali, turns red. True or false?
True – the statement is correct
False – it stays blue in an alkali
True, as blue litmus reddens in alkali
True, but only in warm solution
41.
Litmus is more useful than universal indicator for comparing how strong two acids are. True or false?
True – the statement is correct
True, as litmus gives an exact pH
False – litmus turns red in any acid
True, because litmus has more colours
42.
If blue litmus paper stays blue in a liquid, the liquid must be an alkali. True or false?
True – the statement is correct
True, as only acids leave it blue
True, but only when it is a gas
False – it could also be neutral
43.
Universal indicator is a mixture of several indicators, so it shows a range of colours. True or false?
False – the statement is wrong
True – the statement is correct
False – it is just litmus in water
False – it has only two colours
44.
Juice from boiled red cabbage leaves can be used as an indicator. True or false?
True – the statement is correct
False – the statement is wrong
False – only lab chemicals are indicators
False – cabbage juice has no colour
45.
Red cabbage indicator turns red or pink when it is added to lemon juice. True or false?
False – the statement is wrong
False – it turns green in lemon juice
True – the statement is correct
False – it stays purple in lemon juice
46.
A liquid turned universal indicator green, so Zainab wrote that its pH is exactly 7.0. True or false?
True – the statement is correct
True, as green always means exactly 7.0
True, as indicators beat pH meters
False – the colour only gives an estimate
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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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