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C3 Quick Revision Questions
C3 for AQA GCSE examination 2018 onwards
H = Higher tier only
SS = Separate science only
Question 1
• What is the law of conservation of mass?
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C3 for AQA GCSE examination 2018 onwards
• No atoms are lost or made during a chemical reaction.
Answer 1 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 2
• What is the relative atomic mass?
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C3 for AQA GCSE examination 2018 onwards
• The mass of an atom relative to 1/12th of a carbon-12 atom.
Answer 2 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 3
• What is the formula mass of a molecule?
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C3 for AQA GCSE examination 2018 onwards
• The sum of the atomic masses of all of the atoms in a molecule.
Answer 3 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 4
• Why might a reaction like decomposing a carbonate appear to violate the law of
conservation of mass?
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C3 for AQA GCSE examination 2018 onwards
• The reaction gives off gas (carbon dioxide).
Answer 4 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 4
• Why do reactions stop?
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C3 for AQA GCSE examination 2018 onwards
• The limiting reactant is used up.
Answer 4 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 5
• What is uncertainty in a measurement?
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C3 for AQA GCSE examination 2018 onwards
• The range of values within which the true value of a measurement falls.
Answer 5 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 6
• What is the difference between range and mean?
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C3 for AQA GCSE examination 2018 onwards
Answer 6
• The range is the difference between the highest measurement and the lowest
measurement.
• The mean is the sum of the measurements divided by the number of measurements
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C3 for AQA GCSE examination 2018 onwards
Question 7
• What is precision?
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C3 for AQA GCSE examination 2018 onwards
Answer 7
• Precision refers to the closeness of two or more measurements to each other
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C3 for AQA GCSE examination 2018 onwards
Question 8
• What are numbers of molecules measured in?
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C3 for AQA GCSE examination 2018 onwards
• Moles.
Answer 8 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 9
• What is Avogadro’s number?
.... of 50 H
C3 for AQA GCSE examination 2018 onwards
• 6.02 x 1023
Answer 9 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 10
• What is a mole?
.... of 50 H
C3 for AQA GCSE examination 2018 onwards
• A standard amount of substance. One mole of any substance contains the same number of particles, atoms, molecules or ions as any other one mole.
Answer 10 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 11
• How can you work out the number of moles?
.... of 50 H
C3 for AQA GCSE examination 2018 onwards
• Moles = mass/molar mass
Answer 11 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 12
• How is molar concentration calculated?
.... of 50 H
C3 for AQA GCSE examination 2018 onwards
• Concentration = moles/volume (dm3)
Answer 12 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 13
• How is mass based concentration calculated?
.... of 50 H
C3 for AQA GCSE examination 2018 onwards
• Concentration = mass (g) /volume (dm3)
Answer 13 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 14
• What is the equation for percentage yield?
.... of 50 SS
C3 for AQA GCSE examination 2018 onwards
• %Yield = Actual Mass/Theoretical Mass
Answer 14 .... of 50 SS
C3 for AQA GCSE examination 2018 onwards
Question 15
• How is atom economy calculated?
.... of 50 SS
C3 for AQA GCSE examination 2018 onwards
Answer 15 .... of 50
C3 for AQA GCSE examination 2018 onwards
100
reactants all ofmasses formula relative of Sum
product desiredof mass formula Relative
economy Atom
Question 16
• What is the volume of one mole of gas at room temperature and pressure?
.... of 50 SS H
C3 for AQA GCSE examination 2018 onwards
• 24 dm3
Answer 16 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 17
• What is the mass of three moles of KBr?
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C3 for AQA GCSE examination 2018 onwards
• .1 mole of K is 39
• 1 mole of Br is 80
• 1 mole = 39+80 = 119
• 3 mole = 119 x 3 = 357
Answer 17 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 18
• How many particles in two moles of helium?
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C3 for AQA GCSE examination 2018 onwards
• .
Answer 18 .... of 50
C3 for AQA GCSE examination 2018 onwards
2 x 6.02 x 1023 = 1.204 x 1024
Question 19 .... of 50
C3 for AQA GCSE examination 2018 onwards
• How do you calculate concentration in terms of moles?
• .Concentration = no. moles ÷ volume
Answer 19 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 20
• What can a titration be used to be measure?
.... of 50 SS
C3 for AQA GCSE examination 2018 onwards
• .Can be used to calculate how concentrated a solution is
Answer 20 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 21
• In a titration what piece of titration equipment delivers a fixed volume?
.... of 50 SS
C3 for AQA GCSE examination 2018 onwards
• .A pipette delivers a fixed volume
Answer 21 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 22
• What piece of equipment delivers a changing volume in a titration?
.... of 50 SS
C3 for AQA GCSE examination 2018 onwards
• A burette delivers a variable volume.
Answer 22 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 23
• Explain the process for a titration?
.... of 50 SS
C3 for AQA GCSE examination 2018 onwards
• Fill a burette with acid, record start volume of acid
• Pipette 25cm3 of alkali into a conical flask
• Put a few drops of universal indicator into the flask
• Add the acid from the burette to the conical flask , swirl gently
• When the colour changes to neutral, record the volume of acid used to turn to neutral
Answer 23 .... of 50 SS
C3 for AQA GCSE examination 2018 onwards
Question 24
• How do you find the concentration of acid?
.... of 50 SS
C3 for AQA GCSE examination 2018 onwards
Answer 24 .... of 50
C3 for AQA GCSE examination 2018 onwards
Concentration of alkali x volume of alkali = concentration of acid x volume of acid
Question 25
• What is the equation to calculate percentage uncertainty for a set of measurements?
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C3 for AQA GCSE examination 2018 onwards
• .percentage uncertainty =
range of measurement x 100
mean
Answer 25 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 26
• What is the equation to calculate the range of a set of data?
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C3 for AQA GCSE examination 2018 onwards
• Range = highest measurement – lowest measurement
Answer 26 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 27
• How many moles of H2O will be made when 1 mole of C3H8 react?
C3H8 + 5O2 3CO2 + 4H2O
.... of 50 H
C3 for AQA GCSE examination 2018 onwards
• 4
Answer 27 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 28
• How many moles of H2O will be made when 3 moles of C3H8 react?
C3H8 + 5O2 3CO2 + 4H2O
.... of 50 H
C3 for AQA GCSE examination 2018 onwards
• 12
Answer 28 .... of 50
C3 for AQA GCSE examination 2018 onwards
Question 29
• What mass of H2O will be made when 44g of C3H8 react? (C=12, H=1, O=16)
C3H8 + 5O2 3CO2 + 4H2O
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C3 for AQA GCSE examination 2018 onwards
Answer 29
• 72g
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C3 for AQA GCSE examination 2018 onwards
Question 30
• What mass of H2O will be made when 220g of C3H8 react? (C=12, H=1, O=16)
C3H8 + 5O2 3CO2 + 4H2O
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C3 for AQA GCSE examination 2018 onwards
Answer 30
• 360g
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C3 for AQA GCSE examination 2018 onwards
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