Ch. 20 Chemistry Exam Review
Ch. 20 Chemistry Exam Review
Ch. 20 Chemistry Exam Review
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<strong>Ch</strong>. <strong>20</strong> <strong>Ch</strong>emistry <strong>Exam</strong> <strong>Review</strong><br />
1. When zinc oxide becomes zinc, what type of reaction occurs?<br />
2. Define oxidation.<br />
3. In the reaction of lithium with oxygen, which atom is reduced?<br />
4. In the reaction of calcium with bromine, which atom is the reducing agent?<br />
5. What is the oxidizing agent in the following reaction?<br />
2Na + 2H O → 2NaOH + H<br />
6. What is the reducing agent in the following reaction?<br />
CH + 2O CO + H O<br />
7. What is oxidized and what is reduced in the following equation?<br />
S + Cl SCl<br />
8. Why is oxygen reduced in the reaction of hydrogen with oxygen to make water?<br />
9. The oxidation number of sodium in sodium chloride is ____.<br />
10. The oxidation number of nitrogen in nitrogen gas is ____.<br />
11. What is the oxidation number for each atom in NH4Cl?<br />
12. What is the oxidation number of sulfur in each of the following?<br />
a. SO b. Na SO c. SO d. S O<br />
13. What is the oxidation number of nitrogen in each of the following?<br />
a. NO b. N O c. NH Cl d. Ca(NO )<br />
14. Identify the atom that decreases in oxidation number in the following redox reaction.<br />
2MnO + 2K CO + O 2KMnO + 2CO<br />
15. In the following unbalanced reaction, which atom is oxidized?<br />
H O + Cl + SO HCl + H SO
16. In the following unbalanced reaction, which atom is reduced?<br />
HNO + HBr → NO + Br + H O<br />
17. Which element increases its oxidation number in the following reaction?<br />
BiCl + Na SO → 2NaCl + BiSO<br />
18. Which types of reactions are not redox reactions?<br />
19. Balance the following half-reaction.<br />
MnO → Mn<br />
<strong>20</strong>. What is the oxidation half-reaction for the following unbalanced redox equation?<br />
Cr O + NH → Cr O + N<br />
21. What is the reduction half-reaction for the following unbalanced redox equation?<br />
Cr O + Fe → Cr + Fe<br />
22. What is shown by a half-reaction?<br />
23. How can you identify if a half-reaction represents oxidation or reduction?<br />
24. When the half-reactions Br + 2e → 2Br and Na → Na + e are combined, what will the balanced redox<br />
equation be?<br />
25. Which type of reaction does Pb → Pb represent?
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