Recommendations+from+IGCSE+mock+examinations+2014

back to IGCSE chemistry

2014 > - "spots do not match up" or "spots have traveled up a different height" is what you observe on a chromatogram and is better than writing " have different solubility" which is an inference and not a an explanation.
 * in liquid particle model ensure that particles are touching
 * when using experimental evidence refer to what you observe (if it is qualitative) or use numbers to support a conclusion. E.g.
 * know definitions "word for word" - they should be easy to remember and should be guaranteed marks.
 * follow any instructions e.g "to two decimal places" i.e. write your answer in 2 decimals
 * when possible add more detail e.g. such as numbers of electrons transferred between calcium and fluorine or the number of shells in an atom or the number of electrons on it.
 * think across sections; this means that in some questions that starts of in one section needs an answer from another section e.g to explain how a displacement reaction between metals can be speeded up
 * a clear solution is a solution that you can see through; colourless means the solution has no colour!
 * solubility rules of salts
 * Appendix A in your book.