Lesson 1.1.2
1.1.2 Relative masses and mass spectrometry Quiz: Pearson Edexcel Chemistry, Unit 1
20 questions
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Lesson 1.1.2, Relative masses and mass spectrometry: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 1: Atomic Structure and the Periodic Table, written with Revision Ninja.
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The 20 questions
-
What is measured by a mass spectrometer?
- Absolute atomic mass
- Mass-to-charge ratio
- Ionisation energy
- Electronegativity
-
What value is plotted on the horizontal axis of a mass spectrum?
- Atomic number
- m/z
- Percentage
- Relative abundance
-
What term describes the weighted mean mass of an element's atoms?
- Relative atomic mass
- Relative formula mass
- Relative isotopic mass
- Relative molecular mass
-
Which peak on an organic mass spectrum gives the relative molecular mass?
- Isotope peak
- Fragment peak
- Molecular ion peak
- Base peak
-
Which term is used for the mass of compounds with giant structures?
- Relative formula mass
- Relative isotopic mass
- Relative atomic mass
- Relative molecular mass
-
An element has isotopes 10 (abundance 20%) and 11 (abundance 80%). What is its relative atomic mass?
- 10.8
- 11.0
- 10.2
- 10.5
-
Element Y has isotopes of mass 63 (69%) and 65 (31%). What is its relative atomic mass to one decimal place?
- 63.3
- 64.0
- 63.6
- 63.1
-
Chlorine has isotopes 35Cl (75%) and 37Cl (25%). What is its relative atomic mass to two decimal places?
- 35.75
- 35.50
- 36.00
- 35.25
-
An element has relative atomic mass 24.3 and two isotopes, 24 and 25 only. What percentage of the sample is the 25 isotope?
- 25%
- 10%
- 30%
- 70%
-
What is the relative molecular mass of ethanol, CH3CH2OH? (Use C = 12, H = 1, O = 16.)
- 45
- 46
- 42
- 44
-
What is the relative formula mass of calcium nitrate, Ca(NO3)2? (Use Ca = 40, N = 14, O = 16.)
- 148
- 172
- 150
- 164
-
Chlorine molecules, Cl2, contain isotopes 35 and 37. At which m/z values do molecular ion peaks appear?
- 70, 74 and 76
- 35, 37 and 74
- 70, 72 and 74
- 68, 70 and 72
-
In the mass spectrum of Cl2, what is the expected ratio of peak heights at m/z 70 : 72 : 74?
- 1 : 2 : 1
- 9 : 6 : 1
- 3 : 2 : 1
- 9 : 3 : 1
-
Which sub-atomic particle has a negligible mass compared to protons and neutrons?
- Neutron
- Proton
- Electron
- Nucleon
-
A mass spectrum of benzene shows its M+ peak at m/z 78. What is the relative molecular mass of benzene?
- 79
- 78
- 77
- 6
-
What is the m/z value of a singly charged ion equal to?
- Its mass
- Its velocity
- Its radius
- Its charge
-
Boron has isotopes 10B and 11B with a relative atomic mass of 10.8. Which isotope is more abundant?
- Cannot tell
- 10B
- 11B
- Equal amounts
-
Why is the relative atomic mass of most elements not a whole number?
- Presence of isotopes
- Unstable neutrons
- Nuclear binding energy
- Electron mass loss
-
What is the mass of 2.0 mol of carbon dioxide, CO2? (Use C = 12, O = 16.)
- 44 g
- 88 g
- 66 g
- 22 g
-
A compound shows M and M+2 peaks of almost equal height. Which halogen is present?
- Iodine
- Fluorine
- Bromine
- Chlorine
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