Introductory Concepts to Know in Chemistry!

  • Matter- anything that occupies space and has mass
  • Molecule- the smallest particle of matter capable of independent existence
  • Atom- the fundamental unit constituting all matter
  • 1 mole of a substance
  • 6.022 X 1023 (NA) (Avogadro‚Äôs number) atoms/ molecules/ ions of that substance
  • Atomic/ molecular/ ionic mass of that substance (grams)
  • 22.4 Litres of that substance at STP (standard temperature and pressure)
  • No of moles (n)
  • n = given mass/ molecular mass
  • n = given number of particles/ NA
  • n = given volume of substance/ 22.4
  • Metal reactivity series- the series of metals in their decreasing order of reactivity
    • potassium(K)
    • sodium (Na)
    • calcium (Ca)
    • magnesium (Mg)
    • aluminium (Al)
    • zinc (Zn)
    • Iron (Fe)
    • Copper (Cu)
    • Silver (Ag)
    • Gold (Au)
    • Platinum (Pt)