Different types of bonds form different types of structures – lattices and molecules ... A salt is formed when an acid is neutralised by an alkali. Chemical analysis - (CCEA) Most elements ...

This structure has two helical chains each coiled round the same axis (see diagram). We have made the usual chemical assumptions, namely, that each chain consists of phosphate di-ester groups ...

Symbols, formulae and equations Learn how symbols, formulae and equations help chemists to explain chemical reactions in detail. The periodic table Revise the history, patterns and structure of ...