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LC Chemistry
LC Chemistry

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LC Chemistry

All Chemistry Definitions to Learn for Leaving Certificate - Higher Level

The Atom

  • Dalton’s Atomic Theory: All matter is made up of indivisible atoms which cannot be created or destroyed.
  • William Crookes discovered the Electron. Cathode ray tube.
  • JJ Thomson determined that electrons were negative. Found E/M ratio.
  • Robert Millikan’s Oil drop experiment discovered size of electron’s charge.
  • Plum Pudding Model: Solid positive sphere with electrons embedded.
  • Rutherford discovered the Nucleus. Fired alpha particles at gold foil. Proton.
  • Chadwick discovered the neutron by firing alpha particles at beryllium.
  • Energy level is the fixed energy value that an electron in an atom may have.
  • Heisenberg’s Uncertainty Principle states that it is... (More)
  • H – Hydrogen
  • He – Helium
  • Li – Lithium
  • Be – Beryllium
  • B – Boron
  • C – Carbon
  • N – Nitrogen
  • O – Oxygen
  • F – Fluorine
  • Ne – Neon
  • Na – Sodium
  • Mg – Magnesium
  • Al – Aluminium
  • Si – Silicon
  • P – Phosphorus
  • S – Sulfur
  • Cl – Chlorine
  • Ar – Argon
  • K – Potassium
  • Ca – Calcium
  • Sc – Scandium
  • Ti – Titanium
  • V – Vanadium
  • Cr – Chromium
  • Mn – Manganese
  • Fe – Iron
  • Co – Cobalt
  • Ni – Nickel
  • Cu – Copper
  • Zn – Zinc
  • Ga – Gallium
  • Ge – Germanium
  • As – Arsenic
  • Se... (More)
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LC Chemistry

Organic Chemistry – Summary

General Definitions

  • Organic Chemistry is the study of compounds of Carbon.
  • Hydrocarbons are carbons consisting of carbon and hydrogen only, bonded together covalently. They are used as fuel and feedstock for the chemical industry. Main Sources: Coal, Methane, Crude Oil.
  • Structural isomers are compounds that have the same molecular formula but different structural formulas.

Homologous Series is defined as:

  1. A series of compounds of uniform chemical type.
  2. Showing gradations in physical properties.
  3. Having a general formula for its members.
  4. Each member having similar chemical properties & preparation.
  5. Each member differing from the previous by a CH2 unit.... (More)