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) d) C(s) + O2 (g)  CO2 (g) + thermal energy 3 2 4 5

a) Ca + N2  b) Al + Br2  c) Li + O2  d) Fe + I2  Ca+2 N-3 Ca3N2 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

a) HCl  H2 + Cl2 b) H2O  H2 + O2 c) MgCO3  Mg + C + O2 2 2 2 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

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