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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

GRADE 6 – Unit 8: Chemical reactions – Unit review (50 questions)

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Chemical reactions HIA Science unit review quiz: free practice for HIA International. Work through this Chemical reactions HIA Science unit review quiz and get instant feedback on every answer. If you get stuck, review the 8.4 Detecting chemical reactions – Notes lesson. More practice: HIA International — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 50
  • Passing grade: B+
  • Time limit:
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1.
Which statement best expresses the lesson objective about Simple chemical reactions?
Describe chemical properties of some metals
The terms chemical reaction and combine are always interchangeable
Evidence is unnecessary when studying Simple chemical reactions
Every model is an exact copy of reality
2.
Which statement best expresses the lesson objective about Neutralisation?
Describe neutralisation as a change to pH 7
The terms burette and decay are always interchangeable
Evidence is unnecessary when studying Neutralisation
Every model is an exact copy of reality
3.
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
4.
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
5.
Which statement correctly describes irreversible?
not able to be changed back easily, as most chemical reactions are
a new substance made in a chemical reaction
the reaction of a substance with oxygen, giving out energy
a way of writing a reaction with the reactants on the left and the products on the right
6.
Which practical work belongs to Simple Chemical Reactions?
Relate neutralisation to antacids, soil treatment and industrial waste treatment
Use observations, precipitates, temperature change and gas tests as evidence of reaction
Plan and evaluate a fair test comparing acids, alkalis or neutralisation reactions
Compare metal reactions and use the hydrogen “pop” test safely under supervision
7.
Which practical work belongs to Neutralisation?
Compare metal reactions and use the hydrogen “pop” test safely under supervision
Use observations, precipitates, temperature change and gas tests as evidence of reaction
Plan and evaluate a fair test comparing acids, alkalis or neutralisation reactions
Relate neutralisation to antacids, soil treatment and industrial waste treatment
8.
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
9.
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
10.
Yusuf added alkali from a burette to 25 cm³ of dilute acid and measured the pH after each addition. Use the graph to find the volume of alkali that exactly neutralised the acid.
Dr Dabour Hub Academy - figure 1
About 20 cm³ of alkali
About 7 cm³ of alkali
About 30 cm³ of alkali
About 12 cm³ of alkali
11.
A doctor measured the pH of a patient's stomach contents during an hour. The patient took an antacid tablet at 10 minutes. Which conclusion is best supported by the graph?
Dr Dabour Hub Academy - figure 2
The antacid made the stomach contents neutral within 20 minutes
The antacid raised the pH, but the contents stayed acidic the whole time
The antacid made the stomach contents alkaline after 40 minutes
The antacid added acid, because the pH went down after 40 minutes
12.
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 3
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
13.
Which term is described as: something noticed using the senses or instruments during a reaction?
observation
effervescence
precipitate
colour change
14.
Match the term to its correct meaning: observation
something noticed using the senses or instruments during a reaction
the solution used to test for carbon dioxide, which turns it milky
the test for oxygen, which relights a glowing splint
an insoluble solid that appears when two solutions react
15.
Which term is described as: an insoluble solid that appears when two solutions react?
precipitate
damp litmus test
temperature change
colour change
16.
Match the term to its correct meaning: precipitate
the test for oxygen, which relights a glowing splint
an insoluble solid that appears when two solutions react
fizzing caused by a gas being given off
a rise or fall in temperature showing energy has been transferred
17.
Which term is described as: fizzing caused by a gas being given off?
effervescence
observation
limewater
precipitate
18.
Match the term to its correct meaning: product
a change such as melting in which no new substance is made
a new substance made in a chemical reaction
the reaction of a substance with oxygen, giving out energy
not able to be changed back easily, as most chemical reactions are
19.
Match the term to its correct meaning: effervescence
the test for oxygen, which relights a glowing splint
fizzing caused by a gas being given off
a rise or fall in temperature showing energy has been transferred
the test in which a gas bleaches damp litmus paper
20.
Which term is described as: a substance that neutralises an acid, such as a metal oxide, hydroxide or carbonate?
base
excess
end point
neutralisation
21.
Which term is described as: the solution used to test for carbon dioxide, which turns it milky?
observation
temperature change
limewater
glowing splint test
22.
Match the term to its correct meaning: word equation
the reaction of a substance with oxygen, giving out energy
the compound formed when an element reacts with oxygen
a change in which new substances are formed
a way of writing a reaction with the reactants on the left and the products on the right
23.
Match the term to its correct meaning: variable
a factor that can change in an investigation
getting similar results when the same person repeats the measurement
a reading that does not fit the pattern of the others
the spread of values chosen for the independent variable
24.
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
25.
Which term is described as: the step-by-step instructions for carrying out an investigation?
method
control variable
conclusion
evidence
26.
An insoluble solid formed when two solutions react is a _____.
solvent
suspension
solution
precipitate
27.
Carbon dioxide turns limewater _____.
blue
clear
milky
red
28.
An acid plus a base gives a salt and _____.
oxygen
carbon dioxide
hydrogen
water
29.
Oxygen _____ a glowing splint.
extinguishes
melts
colours
relights
30.
Repeating readings makes results more _____.
difficult
unusual
reliable
colourful
31.
A change in which new substances form is a chemical _____.
property
mixture
state
reaction
32.
Hydrogen gives a squeaky _____ with a lit splint.
flash
glow
pop
hiss
33.
A colour change can be a sign that a chemical reaction has happened. - True or false?
True
False
34.
A colour change always means only a physical change. - True or false?
True
False
35.
Bubbles of gas can be a sign that a chemical reaction has happened. - True or false?
True
False
36.
The independent variable is the one you measure. - True or false?
True
False
37.
Antacids work by adding more acid to the stomach. - True or false?
True
False
38.
Control variables are changed to speed the test up. - True or false?
True
False
39.
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
40.
Burning magnesium in air produces magnesium only. - True or false?
True
False
41.
The total mass of the products is always less than that of the reactants. - True or false?
True
False
42.
Hydrochloric acid neutralised by sodium hydroxide gives sodium chloride and water. - True or false?
True
False
43.
A temperature change proves that no reaction has happened. - True or false?
True
False
44.
In a combustion reaction the fuel is oxidised. - True or false?
True
False
45.
An alkali is a base that does not dissolve in water. - True or false?
True
False
46.
Repeating readings makes the results less reliable. - True or false?
True
False
47.
Bubbles of gas never indicate a chemical reaction. - True or false?
True
False
48.
Oxidation is the gain of oxygen. - True or false?
True
False
49.
A base is a substance that makes an acid stronger. - True or false?
True
False
50.
A temperature change suggests energy has been transferred in a reaction. - True or false?
True
False
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Part of Unit 8: Chemical reactions — see every lesson and quiz in this unit.
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