Curriculum
Course: HIA International — Grade 6
time left:
:
:
Login

Curriculum

HIA International — Grade 6

Unit 1: Cells and organisms

0/23

Unit 2: States of matter, atoms and compounds

0/37

Unit 3: The Solar System and energy

0/44

Unit 4: Living organisms and classification

0/31

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

0/34

Unit 6: Sound, the Earth and eclipses

0/28

Unit 7: Microorganisms and food webs

0/25

Unit 8: Chemical reactions

0/30

Unit 9: Electricity and circuits

0/40
Quiz

Checkpoint Grade 6 Unit 8 – 8.4 Detecting Chemical Reactions

Submit quiz
Once you submit, you will no longer be able to change your answers. Are you sure you want to submit the quiz?
Cancel Submit

Detecting Chemical Reactions Checkpoint Chemistry quiz: free practice for Cambridge Checkpoint (chemistry). Work through this Detecting Chemical Reactions Checkpoint Chemistry quiz and get instant feedback on every answer. If you get stuck, review the 11.4 Detecting chemical reactions 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 Detecting chemical reactions?
List ways to identify that a chemical reaction has occurred
The terms cloudy and glowing are always interchangeable
Evidence is unnecessary when studying Detecting chemical reactions
Every model is an exact copy of reality
2.
Which practical work belongs to Detecting Chemical Reactions?
Relate neutralisation to antacids, soil treatment and industrial waste treatment
Plan and evaluate a fair test comparing acids, alkalis or neutralisation reactions
Compare metal reactions and use the hydrogen “pop” test safely under supervision
Use observations, precipitates, temperature change and gas tests as evidence of reaction
3.
Kareem added dilute acid to powder X and passed the gas through limewater, as shown. The limewater turned from clear to cloudy. What does this show?
Dr Dabour Hub Academy - figure 1
The reaction produced carbon dioxide gas
The reaction produced hydrogen gas
The reaction produced oxygen gas, which clouds limewater
No gas was produced by the reaction
4.
Rosa thinks the gas in her test tube is oxygen. Which of the tests shown in the diagram should she use to check?
Dr Dabour Hub Academy - figure 2
The test shown in picture B
The test shown in picture A
The test shown in picture C
None of these three tests
5.
Aliya mixed three different pairs of substances and recorded the temperature of each mixture for five minutes. Which mixtures show evidence of a chemical reaction?
Dr Dabour Hub Academy - figure 3
Only P, because only a temperature rise shows a reaction
Only R, because its temperature stayed steady
P and Q, because their temperatures changed
P, Q and R, because they were all mixed together
6.
Look at what happened when Ben mixed solution 1 and solution 2. Which sign of a chemical reaction does the diagram show?
Dr Dabour Hub Academy - figure 4
Fizzing: bubbles of gas were given off
Melting: a solid turned into a liquid
Dissolving: a solid disappeared into a liquid
A precipitate: a solid formed when two solutions mixed
7.
Nour did the same fizzing reaction in two flasks on balances. Flask 1 had a bung; flask 2 was open. Why did only flask 2 lose mass?
Dr Dabour Hub Academy - figure 5
The gas made escaped from the open flask, but was trapped in the sealed one
Atoms were destroyed in flask 2 but not in flask 1
No reaction happened in flask 1, so its mass stayed the same
The bung added mass to flask 1 during the reaction
8.
Both beakers in the diagram are full of bubbles. Which statement about them is correct?
Dr Dabour Hub Academy - figure 6
Both are chemical reactions, because both are bubbling
Both are physical changes, because all bubbles are steam
Beaker 2 is a chemical reaction making a gas; beaker 1 is water changing to steam
Beaker 1 is a chemical reaction because it is heated; beaker 2 is physical
9.
Amara recorded five changes she saw at home. Which two changes are chemical reactions?
Changes B and E
Changes A and D
Changes C and D
Changes A and C
10.
Jin tested the gases from three experiments. Using the results, which pairing is correct?
Experiment 2 – oxygen
Experiment 1 – carbon dioxide
Experiment 3 – hydrogen
Experiment 1 – oxygen
11.
Ruth heated a green powder. Which of her observations is the best evidence that carbon dioxide was produced?
The mass of the powder fell by 4.5 g
The powder turned from green to black
The powder stayed black after cooling
The gas turned the limewater cloudy
12.
Kofi pumped ordinary air through one tube of limewater and breathed out through another for the same time. What do his results show?
Breathed-out air contains more carbon dioxide than ordinary air
Ordinary air contains no gases at all
Breathed-out air contains more oxygen than ordinary air does, so it clouds limewater
Limewater turns cloudy with any gas
13.
Omar added a white powder to a liquid and recorded what happened. He says: "The temperature did not change, so no reaction happened." Which is the best evaluation?
He is right: every chemical reaction must change the temperature of the mixture
He is wrong: the fizzing shows a gas was made, so a reaction happened
He is right: fizzing is only a sign of dissolving
He is wrong: the temperature rose by 20 °C
14.
Which of these everyday changes is a chemical reaction?
Water boiling in a kettle until steam comes out
Butter melting in a warm pan
Methane gas burning in a gas cooker flame
Salt dissolving in soup
15.
Why is dissolving sugar in water a physical change and not a chemical reaction?
The sugar is destroyed and cannot be got back
A gas is given off as the sugar dissolves
The water turns into a new sticky substance called syrup that cannot be separated
No new substance forms; the sugar can be got back by evaporating the water
16.
Sara fries an egg. Which observation shows that a chemical change has happened?
The egg white turns from clear to white and cannot be turned back
The egg shell cracks and breaks into pieces when it is tapped on the pan
The egg slides across the pan
The pan gets hot on the cooker
17.
Leila saw bubbles when she added a metal to an acid. Why is this not enough to prove the gas is hydrogen?
Bubbles only ever form when a liquid boils
Other gases also form bubbles; a lighted splint test is needed
Hydrogen never forms bubbles, so the gas must be something else
Bubbles show a precipitate, not a gas
18.
Which is the safest way to carry out the hydrogen "pop" test in class?
Collect a large flask of hydrogen to get a louder pop
Put your ear close to the tube to hear the pop clearly
Wear goggles, use a small tube of gas and hold it away from your face
Use a glowing splint instead, as it cannot cause a pop
19.
Ali mixed two colourless solutions and saw no change at all. He concludes that no reaction took place. Which reply is best?
He is right, because every reaction gives a colour change
He is right, because reactions only happen with solids
He should shake it harder, as this always makes a precipitate
He should measure the temperature, as some reactions only show a temperature change
20.
When a candle burns, some wax melts and some wax burns. Which observation shows the chemical change?
A gas given off turns limewater cloudy
Liquid wax collects at the top of the candle
Drips of wax run down and set hard
The candle becomes shorter as wax drips off
21.
Pablo wants to show that the gas made when vinegar is added to baking soda is carbon dioxide. Which plan will work?
Hold a glowing splint in the gas and see if it relights
Connect a delivery tube from the reaction tube and bubble the gas into limewater
Add universal indicator to the baking soda before mixing
Weigh the vinegar before and after pouring it out
22.
Why is the rusting of an iron nail a chemical reaction?
The nail changes state from solid to liquid
The iron simply dissolves in the rainwater and can be got back by drying it
A new orange-brown substance forms that is hard to change back into iron
The nail only changes shape as it bends
23.
A gas made in a reaction puts out a lighted splint and does not relight a glowing splint. What should the student do next?
Conclude the gas is hydrogen, as it put out the splint
Conclude the gas is oxygen, as it affected the splints
Test it with universal indicator to see if it is a gas
Bubble the gas through limewater, as it may be carbon dioxide
24.
Match each gas to its test result. Which pairing is correct?
Oxygen – gives a squeaky pop
Carbon dioxide – turns limewater cloudy
Hydrogen – relights a glowing splint
Carbon dioxide – relights a glowing splint
25.
Match each sign of reaction to an example. Which pairing is correct?
Precipitate – ice melting in a drink
Colour change – water boiling in a kettle
Light and sound – fireworks exploding
Gas given off – sugar dissolving in tea
26.
Match each key term to its meaning. Which pairing is correct?
Product – a substance you start with
Reversible – cannot be changed back
Precipitate – a gas made in a reaction
Reactant – a substance you start with
27.
Match the term to its correct meaning: physical change
an insoluble solid appearing when two solutions are mixed
something noticed during a reaction using the senses or an instrument
a change such as dissolving or melting where no new substance forms
a gas given off, seen as bubbles or fizzing
28.
An insoluble solid appearing when solutions mix is a _____.
solution
solvent
precipitate
suspension
29.
Grace mixed two solutions in a sealed container and a precipitate formed. Using the table, the total mass of the container and its contents after mixing is _____.
less than 75.5 g
more than 75.5 g
exactly 75.5 g
exactly 4.5 g
30.
A glowing splint bursts back into flame when it is put into a tube of _____.
hydrogen gas
carbon dioxide gas
oxygen gas
water vapour
31.
A change that cannot easily be changed back is described as _____.
reversible
a physical change
a state change
irreversible
32.
When a lighted splint is held at the mouth of a tube and there is a squeaky pop, the gas is _____.
hydrogen gas
oxygen gas
carbon dioxide gas
steam from water
33.
A temperature change proves that no reaction has happened. - True or false?
True
False
34.
A temperature change suggests energy has been transferred in a reaction. - True or false?
True
False
35.
Melting and boiling are chemical reactions. - True or false?
True
False
36.
A colour change with no new substance formed is not a chemical reaction. - True or false?
True
False
37.
Hugo added equal pieces of four metals to the same dilute acid and collected the gas for one minute. Statement: iron did not react with the acid, because it made much less gas than magnesium. True or false?
Dr Dabour Hub Academy - figure 7
True – only magnesium really reacted with the acid
False – iron made 8 cm³ of gas, so it did react
True, but only because iron is a magnetic metal
False – iron made more gas than zinc did
38.
Mrs Okafor's class mixed pairs of solutions. Statement: mixing A and C produced a chemical reaction, but mixing C and D gave no evidence of one. True or false?
False – A + C only mixed, like dissolving
True – A + C formed a solid, C + D showed no change
False – C + D warmed up, so it reacted
True, but only because A is the first solution
39.
Dissolving salt in water is a chemical reaction because the salt seems to disappear. True or false?
False – the salt is still there and no new substance forms
True – anything that seems to disappear must have reacted chemically
True, but only in hot water
False – salt cannot dissolve in water
40.
Limewater turns cloudy when carbon dioxide is bubbled through it. True or false?
False – it turns cloudy with oxygen
True – the statement is correct
False – limewater turns blue
True, but only with hydrogen too
41.
Hydrogen gas relights a glowing splint. True or false?
True – all gases relight a splint
True, but only in a large tube
False – oxygen relights it; hydrogen gives a squeaky pop
False – hydrogen turns limewater cloudy
42.
Kai heated a white powder. A gas turned limewater cloudy and a different white solid was left. Statement: this is a chemical reaction. True or false?
False – heating only causes physical changes
False – the powder just melted
True, but only because it was heated
True – new substances formed on heating
43.
Burning paper is a reversible change. True or false?
False – the ash and gases cannot be turned back into paper
True – the paper can be rebuilt by pressing the ash back together
True, but only for thin paper
False – burning is a physical change
44.
A new substance made in a chemical reaction has different properties from the reactants. True or false?
False – products are the same as reactants
True – the statement is correct
False – only the colour ever changes
True, but only for gases
45.
A match flares with a bright light and gives out heat. Statement: the light is a sign of a chemical reaction. True or false?
False – light only comes from electricity
False – it is a change of state
True – light given out is a sign of reaction
True, but only if there is a bang
46.
When vinegar and baking soda are mixed, the fizzing shows that a gas is being made. True or false?
False – fizzing shows the mixture is boiling
False – fizzing shows a solid is forming
True, but only if the mixture is heated
True – the statement is correct
47.
Baking a cake is an irreversible change. True or false?
True – the cooked cake cannot be turned back into mixture
False – cooling the cake down turns it back into the raw mixture
False – baking is only a change of state
True, but only if the cake burns
48.
Jonah says that a solid appearing when two clear solutions are mixed is evidence of a chemical reaction. True or false?
False – the solid is just undissolved liquid
True – the solid is a precipitate, a new substance
False – solids only form by freezing
True, but only if it fizzes as well
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
Part of Unit 8: Chemical reactions — see every lesson and quiz in this unit.
Accepted payment methods