Chemistry

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Atoms

  • All substances are made from atoms
  • Element: a substancs made from only one sort of atom
  • Groups in the periodis table contain similar properties
  • atoms have a nucleus made of protons and neutrons and around which there are electrons
  • Charges: Proton = +1. Neutron = 0. Electron = -1 
  • The number of electrons is the same as the number of protons in the nucleus
  • Atoms have no overall electric charge
  • The number of protons is its atomic number. Protons + Neutrons = the atomic mass number
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The Periodic Table

  • Elements in the same group have the same number of electrons in their highest energy level (outer electrons) and this gives them similar chemical properties.
  • The elements in Group 0 are the noble gases. they're unreactive because their atoms have stable arrangements of electrons. 
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Calcium Carbonate (Limestone)

  • Environmental. Economic. Social
  • Advantages of quarrying limestone
  • Limestone is a valuable natural resource that is used to make a number of building materials
  • Limestone quarries provide jobs for people which can boost the economy in the area
  • Quarries maintain and build new roads for transportation, making the area more accessible
  • Disadvantages of quarrying limestone
  • There is an increased level of traffic and noise pollution in areas with quarries because of the amount of lorries needed to transport the limestone
  • Quarrying limestone produces lots of dust which will affect the health of people in the area
  • Quarries scar the landscape and ruin the look of the countryside
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