Flashcards
Isotopes and Mass spec
Cards in this deck (11)
- 1Define Relative Atomic Mass (Ar):The average mass of an atom relative to 1/12 of a carbon 12 atom.
- 2Define Relative Molecular Mass (Mr):The average mass of a molecule relative to 1/12 of a carbon 12 atom.
- 3Define an Isotope:Atoms of the same element with different numbers of neutrons and different masses
- 4Define abundanceHow common an isotope is.
- 5How does a Time Of Flight Mass Spectrometer work?-Positive ions are formed from the gaseous isotopes through high energy electron bombardment.
-An electrical field propels the ionic molecules/ atoms down the drift chamber(vacuum) towards the detector.
-The weight of the atom/ molecule affects the flight time, the detector uses this to determine how many isotopes are in the sample and their abundance - 6What does m/z mean?Mass - to - charge ratio.
- 7What is the formula for relative atomic mass when using a mass spec?(isotopic masse X Relative abundance) +...
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Total abundance - 8Give 2 uses of mass spec:-Drug detection
-Creation of the periodic table - 9Why do diatomic molecules show different results to single atoms during mass spec?During High energy electron bombardment, the diatomic molecule can fragment back into single isotopes of the atom. When this happens, all isotopes of the atom including the molecules are detected.
- 10What is the first ionization energy?The magnitude of energy required to remove 1 electron from each atom in 1 mol of gaseous atoms.
- 11What does the molecular ion peak of a mass spec show?The molecular mass of the molecule
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- A-level Chemistry (Atomic structure and the periodic table) Flashcards on Isotopes and Mass spec, created by Jack Rowe on 13/09/2019.
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- Jack Rowe
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