Unit 16: Reaction Rates and Review of Chemical Reactions

Unit 15: RedOx and Review of Chemical Reactions

Essential questions:

·  What happens during oxidation and reduction?

·  What types of reactions are also redox reactions?

·  (Honors Extension) How can you balance redox equations?

Key vocabulary terms:

·  Redox

·  Oxidation

·  Reduction

·  Oxidizing Adent

·  Reducing Agent

Practice:

1.  What happens during oxidation? ______

2.  What happens during reduction? ______

3.  Classify each chemical equation as S, D, SR, DR, C or PHY. Then decide which reactions are oxidation reduction reactions. Circle any substance that makes it obvious the reaction is Redox.
Classifications (Honors additional: Assign Oxidation Numbers and Balance)

S = Synthesis – Chemical reaction

D = Decomposition – Chemical reaction

SR = Single replacement – Chemical reaction

DR = Double replacement – Chemical reaction

C = Combustion – Chemical reaction

Phy = Physical change

RedOx = Oxidation Reduction

______a. ___LiCl(s) + ___ H2O(l) à ___ Li+(aq) + ____Cl-(aq) + ___ H2O(l)

______b. ___K(s) + ___Cl2(g) à ___KCl(s)

______c. _____Mg(s) + _____HCl(aq) à _____MgCl2(aq) + _____H2(g)

______d. _____H2SO4(aq) + _____NaOH(aq) à _____ Na2SO4(s) + _____H2O(l)

______e. _____C3H8(g) + _____O2(g) à _____CO2(g) + _____H2O(g)

______f. _____HOOH(aq) à _____H2O(l) + _____O2(g)

______g. _____ H2O(s) à _____ H2O(g)

______h. _____HNO3(aq) + _____ H2O(l) à _____ H3O+(aq) + ______NO3-(aq)

4.  (Honors) Half reactions: Write the correct half reaction in the space provided.

Br + 1 e- à Br – Mg à Mg +2 + 2 e-

Oxidation Half reaction ______

Reduction Half reaction ______

Balance the equation. ______

5.  (Honors) Put it all together. Show the oxidation number of each element:

K(s) + Br2 (g) à KBr (s)

______

a.  Which substance is oxidized? ______

b.  Which substance is reduced? ______

c.  What is the oxidizing agent? ______

d.  What is the reducing agent? ______

e.  Balance the equation. ______