Chemistry

Chemistry

1. Page 39

   • Compounds are chemically bonded. They are formed when two or more elements are chemically bonded together.
   • Isotopes
     • Isotopes are different atomic forms of the same element, which have the SAME number of PROTONS but a DIFFERENT amount of ELECTRONS
       • Isotopes must have the same atomic number but different mass numbers
     • eg...
       • Carbon-12 has:
         • 6 PROTONS
         • 6 ELECTRONS
         • 6 NEUTRONS
       • Carbon-14 has:
         • 6 PROTONS
         • 6 ELECTRONS
         • 8 NEUTRONS

2. Page 61

   • Energy transferred in Reactions
     • EXOTHERMIC
       • An exothermic reaction is one which transfers energy to the surroundings, usually in the form of heat and usually shown by a rise in temperature
     • ENDOTHERMIC
       • An endothermic reaction is one which takes in energy from the surroundings, usually in the form of heat and is shown by a fall in temperature.