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5 Cards in this Set
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Describe and explain the operation of a mass spectrometer.
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1.the sample is vapourised 2.the sample is ionized(by bombarding with steam of high-energy electrones), because (positive) ions are easier to manipulate than neutral molecules, 2.ACCELERATION - ions are accelerated from this region by the negative grid and pass between the poles of a magnet. 3. DEFLECTION - The beam of positively charged atoms is split by the magnetic field according to the mass-to-charge ratios. 4. DETECTION - measures the mass-to-charge ratio and relative amounts of all the ions present
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Describe how the mass spectrometer may be used to determine relative atomic mass using the 12C scale.
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The relative atomic mass is the weighted average of the isotope masses.The mass spectrometer gives lines which correspond to the mass/charge ratio of each particle (ion) and the height of each line is proportional to the abundance of the specific particle.Hence, a knowledge of mass and abundance can be used to calculate relative mass of the element.
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Calculate non-integer relative atomic masses and abundance of isotopes from given data.
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uhhh...
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Mass Spectrometer
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an instrument which can measure the masses and relative concentrations of atoms and molecules. It makes use of the basic magnetic force on a moving charged particle.
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fractional abundance
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the fraction of the total number of atoms that is composed of a particular isotope
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