- Physical Sciences
the elimination of a hydrogen halide, such as hydrogen bromide, from a halo-alkane.
an ion that has both a positive and a negative charge on the same group of atoms.
this consists of three separate layers of the Earth â the crust, the mantle and the core.
four shared electrons, or two shared pairs of electrons (or two covalent bonds) between the same...
the use of an electric current to cause chemical change in a liquid.