Chapter 6: Chemical Reactions

 Identify redox reactions.  Identify and write equations for combustion reactions.

 A reaction can be classified as a redox reaction if it meets any one of these requirements.  A substance reacts with elemental oxygen (combustion).  A metal reacts with a nonmetal.  During single displacement reactions.  More generally, one substance transfers electrons to another substance.

 2Na(s) + Cl 2 (g)  2NaCl(s)  Na + Cl  Na + + Cl - e-e-

 Combustion reactions are a type of redox reaction.  Combustion reactions are characterized by the reaction of a substance with O 2 to form one or more oxygen-containing compounds, often including water.

 Combustion reactions are exothermic (they emit heat).  Compounds containing carbon and hydrogen always form carbon dioxide and water upon combustion.

 CH 4 (g) + O 2 (g) 

 2Mg(s) + O 2 (g)  2MgO(s)  Mg + O  Mg 2+ + O 2- e-e- e-e-

 2Al(s) + Fe 2 O 3 (s)  2Fe(s) + Al 2 O 3 (s)  Al + Fe 3+  Fe + Al 3+ e-e- e-e- e-e-

 For each reaction, show how electrons are gained and lost:  2Na (s) + Br 2 (l)  2NaBr (s)  2Ca (s) + O 2 (g)  2CaO (s)

 Predict the products for the following combustion reactions:  C 6 H 14 (l) + O 2 (g)   Cu(s) + O 2 (g) 

 Classify each of the following reactions in as many ways possible.  2K (s) + Cl 2 (g)  2KCl (s)  2Mg (s) + O 2 (g)  2MgO (s)

 Classify each of the following reactions in as many ways possible.  Fe 2 O 3 (s) + 2Al(s)  Al 2 O 3 (s) + 2Fe(s)  HNO 3 (aq) + NaOH(aq) → H 2 O(l) + NaNO 3 (aq)

 Ba(NO 3 ) 2 (aq) + (NH 4 ) 2 SO 4 (aq)   HCl(aq) + KOH(aq) 

 Na(s) + Cl 2 (g)   FeCl 3 (aq) + NaOH(aq) 

 Zn(s) + HNO 3 (aq)   C 6 H 14 (l) + O 2 (g) 

 CuSO 4 (aq) + Na 2 CO 3 (aq)   HClO 4 (aq) + NaOH(aq) 

 NI 3 (s)   ZnCl 2 (aq) + Mg(s) 

 H 2 SO 4 (aq) + Ba(OH) 2 (aq)   KNO 3 (aq) + BaCl 2 (aq) 