1. Chapter 6: Chemical Reactions

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

3.  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.

4.  2Na(s) + Cl 2 (g)  2NaCl(s)  Na + Cl  Na + + Cl - e-e-

5.  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.

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

7.  CH 4 (g) + O 2 (g) 

8.  2Mg(s) + O 2 (g)  2MgO(s)  Mg + O  Mg 2+ + O 2- e-e- e-e-

9.  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-

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

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

13.  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)

14.  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)

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

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

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

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

19.  NI 3 (s)   ZnCl 2 (aq) + Mg(s) 

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