20.2 Oxidation Numbers
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1 Name Class Date 20.2 Oxidation Numbers Essential Understanding An oxidation number is a positive or a negative number assigned to an atom to indicate how oxidized or reduced it is. Lesson Summary Assigning Oxidation Numbers Oxidation numbers are assigned according to established rules. If an atom is bonded to another atom, its oxidation number is the charge it would have if all the electrons in the bond were assigned to the more electronegative atom. The oxidation number of a monatomic ion is the same as its charge, in sign and magnitude. In binary ionic compounds, the oxidation number of each atom is its ionic charge. The oxidation number of an uncombined atom is 0. Some elements have only one oxidation number, but some elements have multiple oxidation numbers. The sum of the oxidation numbers of the atoms in a neutral compound is 0. The sum of the oxidation numbers in a polyatomic ion equals the ionic charge of the ion. Oxidation-Number Changes in Chemical Reactions Oxidation numbers change any time an atom is oxidized or reduced. If the oxidation number increases, the atom or ion is oxidized. If the oxidation number decreases, the atom or ion is reduced. After reading Lesson 20.2, answer the following questions. Assigning Oxidation Numbers 1. Is the following sentence true or false? As a general rule, a bonded atom s oxidation number is the charge that it would have if the electrons in the bond were assigned to the more electronegative element. 2. For each binary ionic compound listed in the table, write the symbols for both ions, their ionic charges, and their oxidation numbers. NaCl Compound Ions Ionic charges Oxidation numbers CaF 2 308
2 Name Class Date 3. Is the following sentence true or false? Even though water is a molecular compound, you can still obtain oxidation numbers for the bonded elements by imagining that the electrons contributed by the hydrogen atoms are completely transferred to oxygen. 4. Write the oxidation number, or the sum of the oxidation numbers, for the given atoms, ions, or compounds. a. Cu(II) ion b. Hydrogen in water c. Hydrogen in sodium hydride (NaH) d. Potassium sulfate (K 2 SO 4 ) Oxidation-Number Changes in Chemical Reactions 5. Label each change O if it describes oxidation or R if it describes reduction. a. Decrease in the oxidation number of an element b. Increase in the oxidation number of an element 20.3 Describing Redox Equations Essential Understanding As with all chemical reactions, redox reactions can be described by balanced chemical equations. Lesson Summary Identifying Redox Reactions Redox reactions are those during which an electron transfer occurs. Single-replacement, combination, decomposition, and combustion reactions are redox reactions, and double-replacement and acid-base reactions are not redox reactions. Redox reactions can be identified by a change in the oxidation number of elements during the reaction. A color change sometimes indicates a redox reaction. Balancing Redox Equations As with other chemical equations, the chemical equations that describe redox reactions must be balanced. Redox equations can be balanced using the oxidation-number-change method or the half-reaction method. In the oxidation-number-change method, an equation is balanced by comparing the increases and decreases in oxidation number. A half-reaction is an equation showing either an oxidation or reduction that takes place in a redox reaction. In the half-reaction method, the half-reactions are balanced and then combined into a balanced redox equation.
3 After reading Lesson 20.3, answer the following questions. Identifying Redox Reactions 1. Name two kinds of reactions that are not redox reactions. 2. Look at Figure 20.11b. Write the oxidation numbers of all the elements in the reactants and products. Then answer the questions about the reaction. Oxidation numbers Reactants Products Zinc Hydrochloric acid Zinc chloride Hydrogen Chemical equation Zn(s) + 2HCl(aq) ZnCl 2 (aq) + H 2 (g) a. Is this a redox reaction? b. Which element is oxidized? How do you know? c. Which element is reduced? How do you know? 3. When a solution changes color during a reaction, what can you conclude about that reaction? Balancing Redox Equations 4. Answer these questions to help you balance the following equation using the oxidationnumber-change method. H 2 (g) + O 2 (g) H 2 O(l) (unbalanced) a. What are the oxidation numbers for each atom in the equation? b. Which element is oxidized in this reaction? Which is reduced? c. Use your answers to question 4a above to balance the equation. Write the coefficients needed to make the total change in oxidation number equal to 0.
4 d. What is the final balanced equation? 5. The equations for which reactions are balanced separately when using the half-reaction method? 6. For what kind of reaction is the half-reaction method particularly useful? 7. When would you choose to use oxidation-number changes to balance an equation? 8. What method would you choose to balance an equation for a reaction that takes place in an acidic or alkaline solution? Guided Practice Problems Answer the following questions about Practice Problem 10. Determine the oxidation number of each element in the following: a. S 2 O 3 b. Na 2 O 2 c. P 2 O 5 d. NO 3 S 2 O 3 Step 2. What is the oxidation number for all of the oxygen atoms? Step 3. What is the oxidation number for all of the sulfur atoms? Step 4. What is the oxidation number for each sulfur atom? Step 5. How do you know your answers are correct? Na 2 O 2 Step 1. What is the oxidation number of oxygen? Use Rule 3. (Hint: This compound is a peroxide.) Step 2. What is the oxidation number of sodium? Step 3. How do you know your answers are correct? The oxidation number for both oxygen atoms is. The sum of the oxidation numbers for all the atoms must be. Therefore, the oxidation number for both sodium atoms must equal.
5 P 2 O 5 Step 2. What is the oxidation number for all of the oxygen atoms? 2 5 = Step 3. What is the oxidation number for all of the phosphorous atoms? Step 4. What is the oxidation number for each phosphorous atom? = Step 5. How do you know your answers are correct? NO 3 Step 2. What is the oxidation number for all of the oxygen atoms? 2 3 = Step 3. What is the oxidation number for the nitrogen atom? Step 4. How do you know your answers are correct?
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