Balance the following reactions and classify them as either ENDOTHERMIC or EXOTHERMIC

1. Balance the following reactions and classify them as either ENDOTHERMIC or EXOTHERMIC thermal energy + MgO (s)  Mg (s) + O2 (g) ENDOTHERMIC b) C3H8 (g) + O2 (g)  thermal energy + H2O (l) + CO2 (g) EXOTHERMIC c) NH4NO3(s)+ H2O (l)+thermal energy N2 (g) + H2(g) + O2(g) ENDOTHERMIC d) C(s) + O2 (g)  CO2 (g) + thermal energy EXOTHERMIC 3 2 2 4 5 2 3

2. The following reactions are examples of synthesis reactions. Complete the reactions by writing the formulas of the IONIC products, then balance the equations. • (remember : find the charges, crossover and eliminate the ones) • a) Ca + N2 • b) Al + Br2 • c) Li + O2 • d) Fe + I2 • Thus, 3 Ca + N2 Ca3N2; 2 Al + 3 Br2 2 AlBr3; • 4 Li + O2 2 Li2O; 2 Fe + 3 I2 2 FeI3 Ca+2 N-3 Ca3N2 Al+3 Br-1 AlBr3 Li2O Li +1 O-2 FeI3 Fe+3 I-1

3. Complete the following decomposition reactions, then balance the equations. • (each element in the compound will end up by itself – remember HOBr FINCl) • a) HCl  H2 + Cl2 • b) H2O  H2 + O2 • c) MgCO3 Mg + C + O2 2 2 2 2 2 2 3

4. In each of the following reactions balance the equation and indcate if they are synthesis, decomposition, single displacement or double displacement. • a) H2O + SO3 H2SO4 synthesis • b) Mg(OH)2 + 2 HNO3 Mg(NO3)2 + 2 H(OH) double displacement • c) FeCl3 + 3 NaOH  Fe(OH)3 + 3 NaCl double displacement • d) Cl2 + ZnI2 ZnCl2 + I2 single displacement • e) H2SO4 + Mg  MgSO4 + H2 single displacement • f) K2O + H2O 2 KOH synthesis • g) 2 NaClO32 NaCl + 3 O2 decomposition • h) 2 BCl3 + 3 H2S  B2S3 + 6 HCl double displacement • i) Pb(NO3)2 PbO + 2 NO2 + ½ O2 decomposition • j) 3 NaOH + H3PO4 Na3PO4 + 3 H(OH) double displacement