Mr Ellis

• Formula of nitrate

  NO3-
• Formula of carbonate

  CO32-
• Formula of sulfate

  SO42-
• Formula of hydroxide

  OH-
• Formula of Ammonium

  NH4+
• Define stoichiometry

  A balanced chemical equation shows the quantitive relationship between each chemical
• Define relative atomic mass, Ar

  The weighted mean mass of an atom of an element compared with 1/12 of carbon - 12
• Mass spectrometer process

  1. A sample is bombarded with electrons to produce an Ion
  2. the ion is accelerated by an electric field
  3. the ion passes through a magnetic field to deflect it higher mass = more deflection
  4. a sensor then detects and records the ions reaching it
• What is required for a mass spectrometer to work

  A vacuum
• Define relative molecular mass (Mr)

  the weighted mean mass of a molecule compared with 1/12 of an atom of carbon-12
• Define relative formula mass

  The weighted mean mass of a formula compared with 1/12 of an atom of Carbon-12
• Ideal gasses are gasses that have:

  Molecules in random motion

  No intermolecular forces present

  Elastic collisions with no exchange of kinetic energy

  Particles of zero volumes
• Ideal gas equation

  PV=nRT

  P= Pressure V= volume n= Moles R= Gas constant T= temperature
• How to calculate temperature in K

  273.16 + Temperature in degrees Celsius
• How to calculate dilution factor

  Dilution factor = Original conc / Diluted conc
• How to calculate original stock volume required

  Original stock volume required = Total volume needed / Dilution factor
• How to make a standard solution

  Dissolve an exact mass of a solution in a small amount of distilled water

  Transfer to volumetric flask

  Rinse the beaker with more distilled water and add to flask to minimise residue left behind

  Fill volumetric flask will distilled water till the meniscus reaches the etch mark on the flasks neck