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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

2.3 Planning A Solubility Investigation

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Planning A Solubility Investigation Checkpoint Chemistry quiz: free practice for Cambridge Checkpoint (chemistry). Work through this Planning A Solubility Investigation Checkpoint Chemistry quiz and get instant feedback on every answer. If you get stuck, review the 12.3 Planning a solubility investigation 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.
Grace wants to find out whether wind makes water evaporate faster. Which plan is the best fair test?
One dish with 50 cm³ of water in front of a fan; measure it after 3 hours
Two identical dishes with 50 cm³ of water, one in front of a fan; measure both after 3 hours
A wide dish in front of a fan and a narrow dish without; measure both after 3 hours
Two identical dishes by a fan, one with 50 cm³ and one with 100 cm³; measure after 3 hours
2.
The graph shows solubility curves for two solids, X and Y. Which statement is supported by the graph?
Dr Dabour Hub Academy - figure 1
Below 40 °C, more of Y than X dissolves
X is always more soluble than Y at every temperature
Temperature has no effect on the solubility of Y
The solubility of X decreases as it gets warmer
3.
Leila did each temperature three times and plotted every repeat as a dot on the graph shown. At which temperature are her repeat results least consistent?
Dr Dabour Hub Academy - figure 2
At the 20 °C temperature
At the 80 °C temperature
At the 60 °C temperature
At the 40 °C temperature
4.
Grace tested how the speed of stirring affects the time for a sugar lump to dissolve. What should she do about her results in the table?
Repeat the test at 0 stirs per minute, as 480 s is the largest value
Keep every result, since stirring has no clear pattern
Remove the 80 stirs per minute result, as it is much faster than the rest
Repeat the test at 60 stirs per minute, as 300 s does not fit the pattern
5.
Four groups measured the melting point of the same pure substance Z. Which is the best way to treat the results?
Average all four results to give 55.25 °C
Use group 3 only, because it is the highest reading
Conclude that Z is not pure, because the results are all different
Group 3 is anomalous; leave it out and give the melting point as about 53 °C
6.
Pedro tests whether the distance of a lamp from his model water cycle changes how much water collects in the cup in 30 minutes. Which variable must he keep the same?
The distance of the lamp from the bowl
The volume of water collected in the cup
The time of day he writes his results
The volume of water in the bowl
7.
Each option pairs a key term with its meaning. Which pairing is correct?
Prediction – what you think will happen, with a reason
Mean – the result that does not fit the pattern
Hypothesis – the average of repeated results
Anomalous result – the graph of solubility
8.
Ben investigates whether the mass of an ice cube affects how long it takes to melt on a plate in a warm room. Which is his independent variable?
The time the ice takes to melt
The temperature of the room
The mass of each ice cube
The type of plate that is used
9.
Kofi uses the apparatus shown to find how temperature affects the mass of sugar that dissolves. Which labelled piece of equipment measures his independent variable?
Dr Dabour Hub Academy - figure 3
Apparatus labelled B
Apparatus labelled C
Apparatus labelled A
Apparatus labelled D
10.
Which statement correctly describes control variables?
the highest and lowest values you will use, such as 20 to 80 degrees Celsius
the variables you keep the same so the test is fair, such as the volume of water
the variable you change - here, the temperature of the water
the variable you measure - here, the number of spatulas of salt that dissolve
11.
Two groups heated beakers of melting ice with a Bunsen burner. Group 2 said ice melts at a higher temperature when heated quickly. What is the most likely reason for Group 2's results?
Their ice was taking in less energy than Group 1's ice
Ice really does melt at a higher temperature when heated faster
The particles in their ice were larger than normal ice particles
Their thermometer bulb was touching the hot base of the beaker
12.
Elena repeated her experiment three times. Which is the best value to use as her result?
41.7 cm³, the mean of all three trials
31 cm³, because it is the smallest value
48 cm³, because it is the largest value
47 cm³, the mean of trials 1 and 2 only
13.
Use the table of Mei’s results. What is the best estimate of the mass of ammonium chloride that would dissolve at 50 °C?
About 46 g of it
About 50 g of it
About 55 g of it
About 100 g of it
14.
Kofi heats ice in a beaker and records its temperature every minute. Which change to his method would make his temperature readings most reliable?
Hold the thermometer in the air above the beaker
Stir the mixture gently before each reading
Take readings only at the start and the end
Use a bigger flame so the ice melts faster
15.
Each option pairs a word from planning with an example from a temperature and solubility investigation. Which pairing is correct?
Dependent variable – temperature of the water
Independent variable – mass of salt dissolved
Control variable – temperature of the water
Control variable – 100 cm³ of water each time
16.
Tariq recorded the results shown. Which question was his investigation designed to answer?
Does temperature affect how much salt dissolves?
Does stirring make solids dissolve faster?
Does the volume of water affect solubility?
Do different solids have different solubilities?
17.
Rania writes: "I think more sugar will dissolve in hotter water, because the water particles move faster." Which part of this is her reason, making it a prediction rather than a guess?
More sugar will dissolve
Water particles move faster
I think that it will happen
Hotter water is being used
18.
Diego measured the length of an aluminium rod as he heated it. One of his results does not fit the pattern. Which reading is anomalous?
The reading at 40 °C
The reading at 60 °C
The reading at 80 °C
The reading at 100 °C
19.
Oliver tested whether warmer water dissolves more salt from rock salt in 5 minutes. His results are in the table. Which is the best evaluation of his investigation?
The test is fair because the stirring time was kept at 5 minutes each time
The 20 °C test is not fair because it recovered the least salt
The 80 °C test is not fair because a larger volume of water was used
The test is not fair because the temperature was changed
20.
Farah plotted her solubility results on the graph shown and drew a curve of best fit. Which reading is the anomalous result?
Dr Dabour Hub Academy - figure 4
The reading at 40 °C
The reading at 10 °C
The reading at 70 °C
The reading at 50 °C
21.
Three identical rain gauges were placed around a school on the same day. Which reading gives the best measure of the precipitation that fell, and why?
Gauge 1, because nothing blocked the rain from reaching it
Gauge 2, because trees help rain to fall into the gauge
Gauge 3, because it is the middle value of the three
Gauge 2, because the smallest reading is the most careful
22.
Ella added salt with a spatula, one spatula-full at a time. Her teacher suggests adding 1 g at a time, weighed on a balance. Why is this an improvement?
It makes the salt dissolve faster in the water
It means she does not need to control the temperature
Spatulas make the salt insoluble in water
Each amount is measured, so results are more accurate
23.
Hassan added sugar 5 g at a time to 100 g of water at 30 °C, stirring well after each addition. Use his table to find the mass of sugar that dissolved.
220 g of the sugar dissolved
215 g of the sugar dissolved
210 g of the sugar dissolved
225 g of the sugar dissolved
24.
Kamal concluded: "The solubility of salt increases with temperature." Which addition would make his conclusion stronger?
Saying that he enjoyed doing the experiment
Adding that salt is used in cooking
Writing that all solids behave exactly like salt
Quoting data, e.g. 36 g at 20 °C and 38 g at 80 °C
25.
In a solubility investigation, the variable kept the same is the:
Independent variable
Control variable
Dependent variable
Result
26.
Hana wants to plan a simple demonstration to show that particles in a liquid move faster when the liquid is warmer. Which plan would work best?
Freeze a beaker of water and weigh it before and after freezing
Heat a brass ball and see whether it still fits through a ring
Seal a syringe of water and try to push the plunger in
Add a drop of food colouring to cold and to hot water and compare how fast it spreads
27.
Zara tested salt at 20 °C, 40 °C and 60 °C. She uses her line graph to claim that at 100 °C exactly 40 g would dissolve. What is the main problem with this claim?
Salt does not dissolve at all in boiling water
It goes beyond the range of her data
A line graph cannot be used for temperature
She should have used a bar chart instead
28.
Priya wants to find out whether the type of solvent affects how much of a solid dissolves. Which plan is best?
Add the solid to 50 cm³ of each solvent at 25 °C
Add the solid to water at 20 °C and ethanol at 60 °C
Add salt to water and sugar to ethanol, both at 25 °C
Add the solid to 50 cm³ of water, then to 100 cm³ of ethanol
29.
Omar presented his solubility results as the chart shown. What is the best evaluation of his choice of chart?
Dr Dabour Hub Academy - figure 5
A line graph is better, as temperature is continuous
It is correct, because each temperature is a separate group
A pie chart is better, because it shows fractions of the salt
It is correct, but mass should go on the x-axis instead
30.
Ellie set up the apparatus shown to find the solubility of a salt at 40 °C. Why is using a water bath better than heating the boiling tube directly over a flame?
Dr Dabour Hub Academy - figure 6
It stops any of the salt from dissolving until the end
It keeps the solution at a steady 40 °C, which matters because solubility depends on temperature
It makes the salt dissolve more slowly so it is easier to see
It adds extra water to the tube so more salt can dissolve
31.
Nadia repeated her test at 40 °C three times. Use the table to decide the best value to record for the mass dissolved.
104 g, ignoring 90 g
99 g, using all three
90 g, the smallest reading
105 g, the largest reading
32.
Which plan would give the most reliable value for the solubility of a salt at 40 °C?
Add salt to 100 g of water at room temperature until it looks cloudy; do it once
Heat 100 g of water to boiling, add salt until none is left, then cool to 40 °C
Add 40 g of salt to water at 40 °C and see if it all dissolves; do it once
Keep 100 g of water at 40 °C; add weighed small amounts of salt, stirring, until some stays undissolved; repeat and find the mean
33.
Ruby measured the water for her solubility test by filling a beaker roughly to its 100 cm³ mark. Which change would most improve the accuracy of her results?
Use a larger beaker so that more salt can dissolve
Use tap water that is as hot as possible
Measure 100 g of water on a balance or with a measuring cylinder
Add all of the salt at once instead of a little at a time
34.
The table shows results from a class investigation with oxygen gas and water. Which conclusion matches the data?
Less oxygen dissolves as the water gets warmer
More oxygen dissolves as the water gets warmer
Temperature has no effect on how much oxygen dissolves
Oxygen stops dissolving completely above 20 °C
35.
Match the term to its correct meaning: repeatability
identifying hazards and the steps taken to reduce the risk
something with the potential to cause harm
a factor that can change in an investigation
getting similar results when the same person repeats the measurement
36.
Which term is described as: the variable you measure - here, the number of spatulas of salt that dissolve?
dependent variable
independent variable
control variables
variables
37.
Temperature goes on the x-axis of a solubility graph because it is the _____.
dependent variable
independent variable
control variable
anomalous result
38.
The variable that you change on purpose in an investigation is called the _____.
dependent variable
control variable
independent variable
anomalous variable
39.
Adil’s results were 30 g at 20 °C, 39 g at 40 °C and 48 g at 60 °C. His prediction that "solubility increases with temperature" is supported. True or false?
False – the statement is wrong
True – the statement is correct
False – the mass should have stayed the same
False, because it only rises by 9 g each time
40.
An anomalous result is one that does not fit the pattern of the other results. True or false?
False – the statement is wrong
True – the statement is correct
False – it is the highest value measured
False – it is the mean of the repeats
41.
In a test of how temperature affects solubility, the type of solute should be a control variable. True or false?
True – the statement is correct
False – the statement is wrong
False – it is the dependent variable
False, it should be changed every time
42.
Luca added salt until some stayed on the bottom, but he did not stir. He can be sure the solution was saturated. True or false?
True – the statement is correct
True, because solid on the bottom always means saturated
False – without stirring, more might still dissolve
True, as stirring changes the temperature
43.
The students investigated temperatures from 20 to 80 degrees Celsius. - True or false?
True
False
44.
A solubility curve is a graph of solubility against temperature. True or false?
False – the statement is wrong
False – it plots time against mass
False – it is a bar chart of solutes
True – the statement is correct
45.
A risk assessment identifies hazards and the steps taken to reduce risk. - True or false?
True
False
46.
The students used 50 cm3 of water each time. - True or false?
True
False
47.
The volume of water is changed each time to make the test fair. - True or false?
True
False
48.
The range is the spread of values chosen for the independent variable. - True or false?
True
False
49.
In an investigation into how temperature affects solubility, the mass of solute that dissolves is the dependent variable. True or false?
False – the statement is wrong
False – it is the independent variable
True – the statement is correct
False – it is a control variable
50.
To compare the solubility of two salts fairly, the same mass of water must be used at the same temperature. True or false?
False – only the temperature matters
False – the water should be different
True – these are control variables
True, but only for the salt with the highest solubility
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Part of Unit 2: Dissolving, solubility and chromatography — see every lesson and quiz in this unit.
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