Time of flight mass spectrometer

Last updated: 07/02/2020

WJEC A-Level Chemistry Unit 2.8 – Instrumental analysis Time of flight mass spectrometer

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Question 1 of 25

1. Question
What symbol is used to show relative atomic mass?
- Ar
- Ma
- Mr
- At
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Question 2 of 25

2. Question
What is the equation used to find relative atomic mass?
- Mean mass of an atom of the element / mass of one atom of carbon 12 x 12
- Mass of one atom of carbon 12 / mean mass of a molecule x 12
- Mean mass of a molecule / mean mass of an atom of the element x 12
- Mass of one atom of carbon 12 / mean mass of an atom of the element x 12
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Question 3 of 25

3. Question
What symbol is used to show relative molecular mass?
- Mr
- Ma
- Ar
- At
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Question 4 of 25

4. Question
What is the equation used to find the relative molecular mass?
- Mean mass of a molecule / mass of one atom of carbon 12 x 12
- Mass of one atom of carbon 12 / mean mass of a molecule x 12
- Mass of one atom of the element / mass of one atom x 12
- Mass of one atom of an isotope / mass of one atom of carbon 12 x 12
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Question 5 of 25

5. Question
What is mass spectrometry used for?
- To analyse the isotopes within a sample
- To analyse the atoms in a molecule
- To analyse the mass of a compound
- To analyse the protons within a compound
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Question 6 of 25

6. Question
What can mass spectrometry be used to measure?
- Relative molecular mass
- Mass
- Proton number
- Ionic number
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Question 7 of 25

7. Question
What is the equation used to find the relative isotopic mass?
- Mass of one atom of the isotope / mass of one atom of carbon 12 x 12
- Mean mass of an atom of the element / mass of one atom of carbon 12 x 12
- Mean mass of a molecule / mass of one atom of carbon 12 x 12
- Mass of one atom of carbon 12 / mass of one atom of the isotope x 12
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Question 8 of 25

8. Question
On a mass spectrometer graph, how is the x-axis labelled?
- Progress of reaction
- m/z
- Mass
- Relative abundance %
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Question 9 of 25

9. Question
On a mass spectrometer graph, how is the y-axis labelled?
- Relative abundance %
- m/z
- Progress of reaction
- Mass
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Question 10 of 25

10. Question
What type of solvent is the sample dissolved in?
- Volatile solvent
- Unreactive solvent
- Reactive solvent
- Dissolved solvent
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Question 11 of 25

11. Question
Describe the ionisation step within a mass spectrometer.
- The dissolved sample is forced through a hollow needle to produce positively charged drops, leading to positively charged ions
- Turns the compound into positive ions
- Turns the compound into negative ions
- The dissolved sample is forced through a hollow needle to produce positively charged drops, leading to negatively charged ions
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Question 12 of 25

12. Question
Describe the acceleration step within a mass spectrometer.
- Positive ions accelerate towards the negatively charged plate
- Negative ions accelerate towards the positive ions
- Positive ions accelerate towards the negative ions
- Negative ions accelerate towards the positively charged plate
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Question 13 of 25

13. Question
Describe the ion drift step within a mass spectrometer.
- The positive ions pass through the negatively charged plate and through a flight tube
- The negative ions pass through the positively charged plate and through a flight tube
- The negative ions travel through a flight tube
- The positive ions travel through a flight tube
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Question 14 of 25

14. Question
Describe the detection step within a mass spectrometer.
- The positive ions reach the detector and are recorded
- The compound reaches the detector and is recorded
- The negative ions reach the detector and are recorded
- The protons reach the detector and are recorded
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Question 15 of 25

15. Question
Describe the data analysis step within a mass spectrometer.
- The information is sent to a computer and a spectrum is produced
- The information is sent to a computer and a graph is produced
- The information is processed from the negative ions
- The information is gathered
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Question 16 of 25

16. Question
Name the first three stages of the mass spectrometer.
- Vacuum, ionisation, acceleration
- Vacuum, acceleration, ion drift
- Data analysis, ionisation, ion drift
- Detection, acceleration, ionisation
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Question 17 of 25

17. Question
Name the last three stages of the mass spectrometer.
- Ion drift, detection, data analysis
- Acceleration, detection, data analysis
- Ionisation, data analysis, detection
- Vacuum, ion drift, detection
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Question 18 of 25

18. Question
Within a mass spectrometer, what is the use of the vacuum?
- Creates a vacuum so no air is present
- Creates a vacuum stopping the compound from splitting
- Creates a vacuum stopping the compound from escaping
- Creates a vacuum and securing air
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Question 19 of 25

19. Question
What does a vacuum stop from colliding with air?
- The ions
- The molecules
- The water
- The compound
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Question 20 of 25

20. Question
What step within a mass spectrometer prevents ions from the sample coming into contact with air?
- Vacuum
- Ion drift
- Ionisation
- Acceleration
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Question 21 of 25

21. Question
What step within a mass spectrometer transports the dissolved sample through a hollow needle?
- Ionisation
- Ion drift
- Detection
- Acceleration
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Question 22 of 25

22. Question
What step within a mass spectrometer involves positive ions moving towards the negatively charged plate?
- Acceleration
- Vacuum
- Data analysis
- Ionisation
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Question 23 of 25

23. Question
What step within a mass spectrometer involves positive ions passing through a negative plate and through a flight tube?
- Ion drift
- Vacuum
- Ionisation
- Detection
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Question 24 of 25

24. Question
What step within a mass spectrometer involves positive ions reaching the detector and being recorded?
- Detection
- Ionisation
- Ion drift
- Data analysis
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Question 25 of 25

25. Question
What step within a mass spectrometer presents a mass spectrum?
- Data analysis
- Detection
- Acceleration
- Ion drift
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