Page 110 - Teacher Preview Copy

Worksheet 47 . Topic 11

Set C: Half-reaction equations Objective: To test your ability to determine oxidation and
reduction half-equations

Below, half-reaction equations are given. Next to each half-reaction equation:
Write “Oxidation” next to those that correctly represent oxidation reaction.
Write “Reduction” next to those that correctly represent reduction reaction.
Write “ Neither” next to those that are neither oxidation or reduction reaction.

21. Ca + 2e ------- Ca ______________________
2+
-

22. 2N ----------------- N2 + 6e - ______________________
3-
Teacher Preview Copy

23. Br2 + e -------- 2Br ______________________
-
-

24. Cu + e -------- Cu ______________________
2+
-
+

25. P ------------------ P + 2e - ______________________
3-
Need Help? Study Book : Pg 266 – 267 Set 8 - 11
26. Li ----------------- Li + e ______________________
+
-

27. Cl2 + 2e ------- 2Cl ______________________
-
-
Teacher Preview Copy
28. Mg ---------------- Mg + e ______________________
-
+2

29. S ------------------ S + 2e ______________________
2-
-

7+
-
30. Mn + 3e ------ Mn ______________________
4+

Set D: Conservation of charges Objective: To test how well you can complete half-equation by
by adding correct number of electrons

Below, incomplete half-reaction equations are given. Add the correct number of electrons to
either side of the arrow in each equation to equalize charges (show conservation of charge).
+2
3+
4+
31. Fe ----------- > Fe +3 36. Mn ------------ > Mn

+1
2+
3+
32 K ------------ > K 37. Cr ------------ > Cr Study Book Pg 274 Set 24 (sets 2 and 3)
4+ 2+
7+
+1
33. Sn ------------- > Sn 38. Cl ------------ > Cl
+3 +6 -
34. Cr ------------- > Cr 39. 3Cl2 ------------- > 6 Cl
35. O2 -------------- > 2O -
-
40. 4H ------------- > 2H2
100 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com