Lesson 3.1.2.1
3.1.2.1 Relative atomic mass and relative molecular mass Quiz: AQA Chemistry, Unit 1
20 questions
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Lesson 3.1.2.1, Relative atomic mass and relative molecular mass: 20 multiple choice questions for the AQA Chemistry (7405), Unit 1: Physical chemistry, written with Revision Ninja.
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The 20 questions
-
Relative atomic mass is measured relative to one twelfth of the mass of which isotope?
- Carbon-12
- Carbon-13
- Hydrogen-1
- Carbon-14
-
Relative molecular mass compares the average mass of a molecule to one twelfth the mass of what?
- Carbon-12 atom
- Oxygen-16 atom
- Helium-4 atom
- Hydrogen-1 atom
-
Which term is used instead of relative molecular mass for ionic compounds?
- Relative formula mass
- Molar enthalpy
- Empirical mass
- Relative atomic mass
-
What is the relative molecular mass of CO2? (Ar: C = 12, O = 16)
- 60
- 28
- 44
- 32
-
What is the relative formula mass of CaCO3? (Ar: Ca = 40, C = 12, O = 16)
- 72
- 100
- 120
- 84
-
What standard isotope is used to define relative atomic mass?
- Oxygen-16
- Hydrogen-1
- Carbon-12
- Carbon-14
-
What is the relative molecular mass of H2SO4? (Ar: H = 1, S = 32, O = 16)
- 98
- 114
- 66
- 82
-
What is the relative formula mass of Na2CO3? (Ar: Na = 23, C = 12, O = 16)
- 94
- 118
- 82
- 106
-
What is the relative formula mass of Ca(OH)2? (Ar: Ca = 40, O = 16, H = 1)
- 90
- 58
- 64
- 74
-
What is the relative formula mass of hydrated copper(II) sulfate, CuSO4.5H2O? (Ar: Cu = 63.5, S = 32, O = 16, H = 1)
- 264.5
- 159.5
- 180.5
- 249.5
-
A compound has an empirical formula CH2O (Mr = 30) and a relative molecular mass of 180. What is its molecular formula?
- C6H12O6
- C2H4O2
- C3H6O3
- C12H24O12
-
A gas has Mr = 44. What is the mass of 0.5 mol of this gas?
- 44 g
- 88 g
- 11 g
- 22 g
-
What is the relative molecular mass of ethanoic acid, CH3COOH? (Ar: C = 12, H = 1, O = 16)
- 74
- 30
- 45
- 60
-
What is the relative formula mass of Al2(SO4)3? (Ar: Al = 27, S = 32, O = 16)
- 315
- 369
- 342
- 406
-
A mass spectrum of a substance shows a molecular ion peak at m/z = 46. Which substance is consistent with this?
- Ethanal, CH3CHO
- Ethanol, C2H5OH
- Methane, CH4
- Propane, C3H8
-
Why is the relative atomic mass of chlorine given as a non-integer, 35.5?
- Nuclear mass defect
- Variable electron count
- Inaccurate measurement
- Weighted isotopic mean
-
A mass spectrum of a gas shows a molecular ion peak at m/z = 92. Which formula is consistent with a relative molecular mass of 92?
- N2O
- CO2
- N2O4
- NO2
-
A compound has an empirical formula mass of 15 and a relative molecular mass of 90. How many empirical units are in one molecule?
- 3
- 5
- 9
- 6
-
Which mass term is used for giant ionic compounds like sodium chloride?
- Relative atomic mass
- Relative molecular mass
- Relative isotopic mass
- Relative formula mass
-
Which row correctly lists the relative molecular masses of CH4, C2H6 and C3H8?
- 20, 30, 44
- 16, 30, 44
- 16, 32, 48
- 12, 24, 36
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