AQA A Level Chemistry Bonding
| Front | why do metals have high melting points |
| Back | lots of energy required to overcome strong forces of attraction between positive metal ions and delocalised electrons |
| Front | more on solubility |
| Back | - ionic (charged) and polar substances can dissolve in polar solvents e.g. water - non polar substances dissolve in non polar solvents e.g. hexane |
| Front | Van der Waals' forces |
| Back | - caused by: movement of electrons (unbalances charge distribution within the molecule)- creates instantaneous (temporary) dipole which constantly forms and disappears - this induces a dipole in neighbouring molecules, causing weak forces of attraction between molecules - VDW FORCES PRESENT IN ALL MOLECULES BECAUSE ALL MOLECULES CONTAIN ELECTRONS. they are the ONLY forces present between non-polar molecules. |