Chemistry Unit 1 AS
Not finished, but take a look :)
- Created by: Revision Mode
- Created on: 01-01-13 16:43
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- Chemistry - Unit 1 Foundation Chemistry
- Mass Spectrometry
- 1. Vapourisation
- 2, Ionisation
- 3. Acceleration
- 4. Deflection
- 5, Detection
- Ions of increasing mass reach the detector
- accept electrons, create current proportional to the abundance
- Magnetic field deflects ions into an arc
- Depends upon strength of magnetic field and heavy/light ions
- 5, Detection
- Positive ions accelerated by electric field
- 4. Deflection
- High energy electrons fired at gas particles to knock off an electron, forming positive ion
- 3. Acceleration
- Sample is vaporised - turned into gas
- 2, Ionisation
- Can be used to finds out...
- Relative atomic mass
- Relative isotopic abundance
- Relative molecular mass
- Accurate info
- 1. Vapourisation
- Amount of Substance
- Moles = Mass /Relative atomic mass
- Ideal gas equation
- pV=nRT
- R=gas constant, 8.31Jk-1mol-1
- n=number of moles
- T=temp, K
- V=volume, m3
- p=pressue,, Pa
- pV=nRT
- Moles = concentration X Volume
- Conc=moldm-3
- Volume=dm3
- Concerntration (gdm-3) = molarity X molar mass
- molarity = modlm-3 (conc)
- molar mass = atomic mass
- Reacting volume of gases
- Moles = Volume (dm3) / 24
- Percentage Yield
- %= (Actual / Predicted) X 100
- Atom Economy
- % = (mass of desired product / totat mass of reactants) X 100
- Mass Spectrometry
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