One of the least abundant gases in the atmosphere is
A gas which pops when ignited in air is
carbon dioxide hydrogen nitrogen oxygen
Some substances do not change chemically when heated. An example of such a substance is
copper carbonate hydrated copper sulphate magnesium oxide potassium manganate(VII}
A solution of copper sulphate forms crystals when left on a window sill because water is lost by
boiling condensation evaporation sublimation
A substance which forms a basic oxide and which is not attracted by a magnet could be
carbon copper iron sulphur
Sand is most easily separated from water by
chromatography distillation filtration melting