YEAR 9 CHEMISTRY RECAP

YEAR 9 CHEMISTRY RECAP

1. WHAT ARE CHEMICALS MADE OF

   • ATOMS
     • NEUTRONS
       • MASS OF APPROX. 1 AMU
       • TOGETHER WITH PROTONS, THEY CONTRIBUTE TO ATOMIC MASS
       • HAVE A NEUTRAL CHARGE
     • PROTONS
       • POSITIVE CHARGE
       • MSS OF 1 AMU
       • LOCATED IN THE NEUCLEUS
       • NUMPER OF PROTONS DETERMINES THE ATOMIC NUMBER- THIS DEFINES THE TYPE OF ELEMENT
     • ELECTRONS
       • NEGATIVELY CHARGED
       • ORBIT THE ATOM
       • REMAIN I ORBIT AROUND ATOM DUE TO ATTRACTION TO POSITIVELY CHARGED PROTONS
       • CHANGING THENUMBER OF E GIVES THE ATOM A CHARGED CALLED AN ION
       • VERY LOW MASS