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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

8.3 Investigating Acids And Alkalis

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Investigating Acids And Alkalis Checkpoint Chemistry quiz: free practice for Cambridge Checkpoint (chemistry). Work through this Investigating Acids And Alkalis Checkpoint Chemistry quiz and get instant feedback on every answer. If you get stuck, review the 11.3 Investigating acids and alkalis 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.
Why should a dropper or burette be used to add the alkali, rather than pouring it from a bottle?
It makes the alkali stronger as it passes through the narrow glass tube
It adds small, measured amounts, so you can stop exactly at pH 7
It stops the mixture from warming up
It changes the colour of the indicator more quickly
2.
Kemal is comparing how much of each antacid is needed to neutralise acid. Why must he keep the volume and strength of the acid the same?
So that any difference is caused only by the type of antacid
So that the acid turns the indicator blue
So that he does not need to repeat the test
So that the antacid becomes the dependent variable
3.
Mateo did three repeats for each of four toothpastes. The dots show each repeat and the black line shows the mean. For which toothpaste should he trust his mean the least?
Dr Dabour Hub Academy - figure 1
Toothpaste Q, as its repeats are the most spread out
Toothpaste R, as it needed the most drops of acid
Toothpaste S, as it needed the fewest drops of acid
Toothpaste P, as two of its repeats are the same
4.
Four students compared how much of each of four remedies neutralises acid. Which action by a student would make the test unfair?
Wearing goggles for every test
Repeating each test three times
Using 10 cm³ of acid for two remedies and 20 cm³ for the others
Recording all results in a table with units in the column headings
5.
Nina drew this results table for her investigation. What is the most important improvement she should make to it?
Remove the mean column because it is not a real result
Write the results as words instead of numbers
List the remedies in alphabetical order
Add units, such as cm³ and g, to the column headings
6.
Sofia tested one sample of each of three indigestion remedies, once each, and concluded "Remedy B is the best". Which is the best evaluation of her conclusion?
It is strong, because she tested three different remedies
It is strong, because testing once saves time and acid
It is weak, because with no repeats she cannot tell if a result was a mistake
It is weak, because she should have tested only one remedy
7.
Four groups each measured the pH of the same bathroom cleaner with a pH meter. Which value should the class report?
About 11.1, the mean of all four
About 11.8, leaving out group 3
Exactly 9.1, the lowest reading
About 10.5, halfway between 9.1 and 11.9
8.
Why do students often put a spotting tile or test tube on a white tile when using universal indicator?
To see the colour clearly
To keep the solution warm
To stop the indicator reacting
To make the pH more accurate
9.
Which statement best expresses the lesson objective about Investigating acids and alkalis?
Write a question that can be tested
The terms remedy and variable are always interchangeable
Evidence is unnecessary when studying Investigating acids and alkalis
Every model is an exact copy of reality
10.
Ella wanted to know which toothpaste is more alkaline. Using her results, why is her conclusion "Toothpaste G is more alkaline" not valid?
She kept the temperature the same, which is not allowed
She used vinegar, which cannot neutralise an alkali
She counted drops, which cannot measure an amount of acid
She used different masses of toothpaste, so it was not a fair test
11.
Match each piece of equipment to its use. Which pairing is correct?
pH meter – gives a number for the pH of a solution
Measuring cylinder – measures the mass of a powder
Balance – measures the volume of acid
Goggles – measure the temperature
12.
Farah investigated which vinegar is most acidic. Match each stage to an example from her work. Which pairing is correct?
Prediction – vinegar C needed 21.5 cm³ of alkali
Conclusion – vinegar C needed the most alkali, so it is the most acidic
Results – I think vinegar C will be most acidic, as its label says 8%
Plan – vinegar C was the most acidic of the four
13.
Maya tests each antacid three times rather than once. What is the main reason?
To check her results and spot any that do not fit
To make the test more dangerous
To change the independent variable
So she does not need to draw a results table or a bar chart
14.
Which of these is a question that can be answered by a scientific investigation?
Does the volume of lemon juice affect how much alkali is needed to neutralise it?
Is lemon juice nicer to drink than orange juice, and which would most people choose?
Why do some people like sour food?
Which colour of universal indicator looks prettiest?
15.
Kiran added different masses of lime to 100 g samples of the same soil and measured the pH. Which conclusion is best supported by his graph?
Dr Dabour Hub Academy - figure 2
Adding 20 g of lime would make the soil reach pH 10
Adding lime lowered the soil pH at every mass tested
Adding 8 g of lime made the soil strongly alkaline
More lime raised the pH, but each extra 2 g raised it by a smaller amount
16.
Which order of steps should a student follow when carrying out an investigation?
Prediction, results, question, plan, conclusion
Question, prediction, plan, results, conclusion
Plan, conclusion, question, results, prediction
Results, question, prediction, conclusion, plan
17.
Ravi wrote this plan to find out whether soils from different gardens have different pH. Which pairing is correct?
pH reading of each soil – control variable
Mass of soil used (5 g) – dependent variable
Garden the soil came from – independent variable
Volume of distilled water – independent variable
18.
Why does the teacher tell the class to use only small volumes of acid and alkali in their investigation?
To make the results more accurate and easier to read on the scale
To make the reaction reach pH 7 faster
So the indicator does not change colour
To reduce the harm if any liquid is spilled or splashed
19.
Arjun will compare how much lime is needed for soils from three different farms. Which is the best prediction?
I think soil from the farm by the pine forest will need the most lime of the three
Some soils will need lime and some will not
The pine-forest farm soil will need most lime, as pine needles make soil acidic
I think the results will be interesting
20.
Which statement correctly describes mean?
the average of repeat readings, calculated after discarding anomalies
the gap between the values chosen for the independent variable
identifying hazards and the steps taken to reduce the risk
getting similar results when the same person repeats the measurement
21.
Chloe investigates how the temperature of dilute acid affects the time an antacid tablet takes to stop fizzing. What is her independent variable?
The time taken to stop fizzing
The temperature of the acid
The volume of acid used
The type of antacid tablet
22.
Aisha must measure out exactly 20 cm³ of dilute acid for each of her tests. Which piece of equipment in the diagram should she use?
Dr Dabour Hub Academy - figure 3
The item labelled A
The item labelled B
The item labelled C
The item labelled D
23.
Which practical work belongs to Investigating Acids And Alkalis?
Relate neutralisation to antacids, soil treatment and industrial waste treatment
Use observations, precipitates, temperature change and gas tests as evidence of reaction
Compare metal reactions and use the hydrogen “pop” test safely under supervision
Plan and evaluate a fair test comparing acids, alkalis or neutralisation reactions
24.
Match each safety step to its reason. Which pairing is correct?
Use small volumes – makes the results more accurate
Stand up while working – keeps the solution neutral
Wipe up spills at once – makes the reaction faster
Wear goggles – protects eyes from splashes
25.
Nadia placed a 1.00 g piece of eggshell into each of seven solutions of different pH and measured the mass lost after one hour. Which conclusion is best supported by her bar chart?
Dr Dabour Hub Academy - figure 4
The lower the pH of an acid, the more eggshell it destroyed
Every corrosive solution destroyed eggshell, including the strong alkali
Weak acids had no effect at all on the eggshell
Eggshell dissolves best in a neutral solution
26.
Farah neutralised 10 cm³ of four vinegars with the same alkali, using universal indicator. Which vinegar contained the most acid?
Dr Dabour Hub Academy - figure 5
Vinegar B, because it needed the least alkali
Vinegar A, because it is first on the chart
Vinegar C, because it needed the most alkali
All four were equal, as each was 10 cm³
27.
Ella measured how much alkali was needed to neutralise different volumes of the same acid. Which statement about her graph is correct?
Dr Dabour Hub Academy - figure 6
The result for 15 cm³ of acid does not fit the pattern, so she should repeat it
The result for 25 cm³ does not fit, because it is the largest value
Every result fits the pattern, so no test needs repeating
The result for 5 cm³ does not fit, because the line starts at zero
28.
Pupils tested the pH of lake water at different distances from a factory pipe. Which conclusion best describes the results?
The water is most acidic near the pipe and nearer neutral further away
The water is most alkaline near the pipe and more acidic further away
The pH stays the same, so the pipe has no effect on the lake
The water becomes strongly alkaline 400 m from the pipe
29.
Match the term to its correct meaning: anomalous result
the average of repeat readings, calculated after discarding anomalies
a reading that does not fit the pattern of the others
the gap between the values chosen for the independent variable
identifying hazards and the steps taken to reduce the risk
30.
Ahmed repeated his test four times for acid X. The mean volume of alkali needed for acid X, after leaving out the anomalous result, is _____.
13.7 cm³
12.3 cm³
17.8 cm³
10.0 cm³
31.
The diagram shows part of the measuring cylinder Sanjay used for his alkali, viewed at eye level. The volume of alkali in the cylinder is _____.
Dr Dabour Hub Academy - figure 7
exactly 27 cm³
exactly 24 cm³
exactly 25 cm³
exactly 26 cm³
32.
The variable you measure in an investigation is called the _____.
independent variable
dependent variable
control variable
range of the variable
33.
Near the neutral point, alkali should be added a drop at a time so that the student does not _____.
reach pH 7 at all
need to wear goggles
go past pH 7
use a measuring cylinder
34.
How much acid is dissolved in a given volume is its _____.
pH
density
strength
concentration
35.
You should read the scale of a measuring cylinder with your eye level with the liquid surface. True or false?
False – read it from above for the best view
True – this avoids reading the scale wrongly
False – read it from below the bench
True, but only for alkalis
36.
A conclusion should describe what the results show and answer the question being investigated. True or false?
False – a conclusion repeats the prediction
False – a conclusion lists the equipment
True – the statement is correct
True, but only when the prediction was right
37.
Grace used a thermometer that always reads 2 °C too high. Repeating her readings three times will remove this error. True or false?
True – the statement is correct
False – every reading is 2 °C too high
True, because a mean cancels out any error
True, as long as she stirs every time
38.
If the equipment is accurate, doing each test once is enough to trust the result. True or false?
True – good equipment never gives a wrong result, so one test will do
False – repeats are still needed to check the result
True, but only for a pH meter
False – accurate equipment is not needed
39.
Goggles need to be worn only when acids are being heated. True or false?
True – cold acids cannot harm eyes, so goggles are only for heating
True, but only for strong acids
False – goggles are only for alkalis
False – wear them whenever acids or alkalis are used
40.
Lily's results with three acids supported her prediction. Statement: this proves her prediction is true for every acid. True or false?
True – supported means proven, so it must work for all acids
True, but only if she used a pH meter
False – her prediction must be wrong
False – results only support it for what was tested
41.
Isla predicted: "The larger the volume of vinegar, the more baking soda is needed to neutralise it." Statement: her results support this prediction. True or false?
False – the mass needed falls as the volume rises
False – the results show no pattern at all
True – the mass needed rises as the volume rises
True, but only for the first two volumes
42.
Three repeats gave 20 cm³, 22 cm³ and 24 cm³ of alkali. Statement: the mean is 22 cm³. True or false?
True – 66 ÷ 3 = 22 cm³
False – the mean is 66 cm³
False – the mean is 24 cm³
True, but only if one value is removed
43.
Ms Tan tested four samples with universal indicator paper and with a pH meter. Statement: universal indicator alone would have shown that samples 1 and 2 have different pH values. True or false?
True – the colours for samples 1 and 2 were different
False – both gave green, but only the meter showed a difference
True, but only if the paper was left in longer
False – samples 1 and 2 had exactly the same pH
44.
When comparing how much alkali different acids need, temperature should be kept the same because it is a control variable. True or false?
True – the statement is correct
False – temperature is the dependent variable
False – temperature is the independent variable
True, but only in summer
45.
An anomalous result should be identified and left out of the mean. - True or false?
True
False
46.
A prediction is just a guess and does not need a reason. True or false?
False – a prediction says what will happen and why
True – a prediction never has a reason
True, but only when you are unsure
False – a prediction is written after the results
47.
In a fair test only the independent variable is changed. True or false?
False – two variables can be changed
False – no variables are changed
True, but only in chemistry tests
True – the statement is correct
48.
The probe of a pH meter should be rinsed with distilled water between testing different liquids. True or false?
False – the statement is wrong
False – rinsing changes every pH
True – the statement is correct
False – the probe cleans itself
49.
Tomás diluted vinegar more and more with pure water and measured the pH each time (see graph). He predicts: "If I keep diluting it, the vinegar will eventually become an alkali." True or false?
Dr Dabour Hub Academy - figure 8
False – the pH only gets closer to 7
True – the statement is correct
True, once it is diluted a million times
True, because the pH rises at every step
50.
Pedro changed both the type of antacid and the volume of acid between tests. Statement: his results can show which antacid works best. True or false?
True – more changes give more information
True, but only if he repeats each test
False – he changed two variables at once
False – antacids cannot be compared
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Part of Unit 8: Chemical reactions — see every lesson and quiz in this unit.
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