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The Major Classes of Chemical Reactions

# The Major Classes of Chemical Reactions - The Major Classes...

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The Major Classes of Chemical Reactions 1. Which of the following pairs of molecules have the same oxidation number for carbon? a. CO and CO 2 b. CH 4 and CCl 4 c. C 6 H 12 O 6 and C(s) d. H 2 CO and COCl 2 e. Carbon always has an oxidation number of +4 2. What mass of CuSO 4 .5H 2 O would you need to prepare 250.0 mL of a 0.250 M solution? [MW of CuSO 4 .5H 2 O = 249.5 g/mol] 3. Calculate the concentration of a solution formed when 15.0 mL of 6.00 M HCl are diluted with 25.0 mL of water. 4. Calculate the molarity of a sodium hydroxide solution if 10.42 mL of this solution are needed to neutralize 25.00 mL of 0.2043 M oxalic acid. H 2 C 2 O 4 (aq) + 2NaOH(aq) --> Na 2 C 2 O 4 (aq) + 2H 2 O(l) 5. What is the oxidation number of Cr in potassium dichromate, K 2 Cr 2 O 7 ? a. +2 b. +4 c. +6 d. -4 e. -6 6. What is the molarity of a solution made by having 90.0 g of acetic acid, CH 3 CO 2 H, in 0.750 L of solution and given the atomic weights: C = 12.01 amu; H = 1.008 amu; O = 16.00 amu? 7. How many grams of CaO are required for complete reaction with the HCl in 275 mL of a 0.523 M HCl solution? The equation for the reaction is, CaO + 2HCl --> CaCl 2 + H 2 O and the atomic weights are Ca = 40.08 amu; O = 16.00 amu.

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8. What is the concentration of a NaOH solution made by dissolving 10.0 g NaOH in 50.0 mL of water and adjusting the volume to 250.0 mL? 9. For the redox reaction: Ca(s) + 2H 2 O(l) --> Ca 2+ (aq) + 2OH - (aq) + H 2 (g) which of the following statements is true? a. Ca is the oxidizing agent. b. H 2 is reduced. c. Ca is reduced. d. H 2 O is the oxidizing agent. e. H 2 O is oxidized. 10. Sodium thiosulfate is used with silver bromide in film developing. The formula for sodium thiosulfate is Na 2 S 2 O 3 . What is the oxidation number for S, sulfur? 11. Calculate the molarity of vinegar (acetic acid) solution if you need 34.57 mL vinegar to neutralize (use up) 25.19 mL of 0.1025 M NaOH. CH 3 COOH(aq) + NaOH(aq) --> CH 3 COO - (aq) + Na + (aq) + H 2 O 12. Students were trying to determine the identity of a substance dissolved in water. The solution was odorless and colorless. After they had narrowed the list of possible substances to five compounds they added solutions of Na 2 S, KOH, and HCl to individual samples of the unknown and recorded the results as shown in the table. Possibilities: AgNO 3 ; Na 2 CO 3 ; Na 2 S ; NaCl ; NH 3 Table 1: Observations of Unknown with Test Reagents with Na 2 S with KOH(aq) with HCl(aq) unknown colorless solution; no precipitate; no bubbling colorless solution; no precipitate; no bubbling colorless solution; no precipitate; no bubbling The dissolved "unknown" substance in the solution is:

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