Relative Molecular Mass and ions quiz

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Questions and Answers

What is the purpose of accelerating the positive ions towards a negatively charged detection plate in mass spectrometry?

  • To separate the ions based on their charge
  • To ionize the atoms further
  • To neutralize the ions before detection
  • To separate the ions based on their mass (correct)

In the ionisation process of mass spectrometry, what is removed from the atoms to create positive ions?

  • Protons
  • Neutrons
  • Nuclei
  • Electrons (correct)

In Time of Flight (TOF) mass spectrometry, what is measured to identify different isotopes?

  • The mass of the ions
  • The energy of the ions
  • The time it takes for ions to reach the detector (correct)
  • The charge of the ions

What type of charge do the ions have after the ionisation process in mass spectrometry?

<p>Positive charge (C)</p> Signup and view all the answers

What is produced as a result of the mass spectrometry analysis?

<p>A spectrum showing the relative abundance of each isotope (A)</p> Signup and view all the answers

What is the primary purpose of mass spectrometry?

<p>To identify different isotopes and find the relative atomic mass of an element (A)</p> Signup and view all the answers

What is the primary purpose of the magnetic field in mass spectrometry?

<p>To deflect the ions into a curved path (A)</p> Signup and view all the answers

What happens when a positive ion hits the negatively charged detection plate?

<p>It gains an electron, producing a flow of charge (A)</p> Signup and view all the answers

What is the purpose of the analysis step in mass spectrometry?

<p>To produce a spectra print-out with the relative abundance of each isotope (B)</p> Signup and view all the answers

What happens if a 2+ charged ion is produced during the ionization process?

<p>It will be deflected less by the magnetic field, resulting in a smaller radius path (B)</p> Signup and view all the answers

What is the purpose of calculating the Ar value from the mass spectrometry data?

<p>To identify the element by referring to the Periodic Table (B)</p> Signup and view all the answers

How is the Ar value calculated from the mass spectrometry data?

<p>By multiplying each m/z value by its abundance and adding them together, then dividing by the total abundance (A)</p> Signup and view all the answers

What is the main factor that determines the molecular ion peak in a mass spectrum?

<p>The relative molecular mass of the molecule (B)</p> Signup and view all the answers

What is the characteristic pattern observed in the mass spectrum of chlorine?

<p>A 3:1 ratio for Cl+ ions and a 3:6:9 ratio for Cl2+ ions (B)</p> Signup and view all the answers

What is the process of ionization energy defined as?

<p>The minimum energy required to remove one mole of electrons from one mole of atoms in a gaseous state (C)</p> Signup and view all the answers

Why do successive ionization energies typically require more energy?

<p>The electrostatic force of attraction between the positive nucleus and the negative outer electron increases (D)</p> Signup and view all the answers

What is the primary factor that influences the trends in first ionization energy within the Periodic Table?

<p>The proton-electron forces of attraction and electron shielding (C)</p> Signup and view all the answers

In mass spectrometry, what is the process of ion drift?

<p>The process of separating ions based on their mass-to-charge ratio (C)</p> Signup and view all the answers

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