Name methane as the main constituent of natural gas

Describe chemical tests for the presence of water using anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate

Describe tests using aqueous sodium hydroxide and aqueous ammonia to identify the aqueous cations: (a) aluminium, ( Al^{3+} ) (b) ammonium, ( NH_4^+ ) (c) calcium, ( Ca^{2+} ) (d) chromium(III), ( Cr^{3+} ) (e) copper(II), ( Cu^{2+} ) (f) iron(II), ( Fe^{2+} ) (g) iron(III), ( Fe^{3+} ) (h) zinc, ( Zn^{2+} )