Page 330 - Teacher Preview Copy

.
Topic 11: Redox and electrochemistry

7. Redox reactions: Determining which equation represents a redox reaction
1. Which is a redox reaction?
1) Zn + 2HCl --------- ZnCl2 + H2

2) Zn(OH)2 + 2HCl -------- ZnCl2 + 2H2O
+
-
3) NH4 + OH -- NH4OH
4) H3O + OH ------ H2O + H2O
+
-

2. Which equation is an oxidation – reduction reaction?
1) 2HCl + CaCO3 ---- CaCl2 + H2O + CO2
2) 2HCl + FeS -------- FeCl2 + H2S
3) 4HCl + MnO2 ------- MnCl2 + H2O + Cl2
4) HCl + KOH -------- KCl + H2O
Teacher Preview Copy
Teacher Preview Copy

3. Which of the following equations is a redox reaction?
2-
2+
1) Ca + SO4 --------- CaSO4
2) H+ + OH- ------------- H2O
3) Pb(NO3)2 + NaI ---- 2NaNO3 + PbI2
4) Cu + AgNO3 ---------- Ag + Cu(NO3)2

4. In which equation would there be a simultaneous losing and gaining of electrons?
1) NaCl + AgNO3 -------- NaNO3 + AgCl
2) HCl + Ca(OH)2 ------ CaCl2 + 2H2O
3) 2KClO3 + MgI2 --------- Mg(ClO3)2 + 2 KI
4) 2KClO3 ------------------ 2KCl + 3O2
5. Which equation represents oxidation – reduction reaction?
1) SO2 + H2O -------- H2SO3
2-
2) SO3 + 2H+ -------- H2SO4
3) O2 + 2H2 ----------- 2H2O
-
+
4) OH + H ------------ H2O

6. Which equation is a redox reaction?
1) Mg + H2SO4 ----------- MgSO4 + H2
2) Mg(OH)2 + H2SO4 ---- MgSO4 + H2O
2+
-
3) Mg + 2OH --------- Mg(OH)2
4) MgCl2 + 6H2O --------- MgCl2.6H2O

7. Given the four equations below.
I: AgNO3 + NaCl --- AgCl + NaNO3
II: Cl2 + H2O ------- HClO + HCl
III: CuO + CO ------- CO2 + Cu
IV4: LiOH + HCl ------ LiCl + H2O

Which two equations represent redox reactions?
1) I and II
2) II and III

3) III and I
4) IV and II

320 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com