Classify as to type of reaction
	• 2Al(OH)3(s) g Al2O3(s) + 3H2O(g) • Fe2S3(s) g 2Fe(s)  + 3S(s) • Na2CO3(aq) + BaCl2(aq) g BaCO3(s) + NaCl(aq) • C(s) + O2(g) g CO2(g)