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

a) 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 energyEXOTHERMIC

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• 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

Li +1 O-2 Li2O

Fe+3 I-1 FeI3

• 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