Concept explainers
Assign oxidation numbers to all the elements in each of the following reactions, and identify the reactant that is oxidized, the reactant that is reduced, the oxidizing agent, and the reducing agent: (15.1)
a.
b.
c.
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- (7.12) A technician plates a faucet with 0.86 g Cr metal by electrolysis of aqueous Cr2(SO4)3. If 12.5 min is allowed for the plating, what current is needed? Molar mass of Cr: 51.996 g/mol Analysis/Strategy: mass of Cr ® mol Cr mol e¯ (or Faraday) ® coulombs ® amperes Reduction half-reaction of chromium solution to chromium metal: Cr* ,+3, (aq) e¯ ® Cr(s) + chromium solution, Cr2(SO4)3, has the ions: [Cr*3 s04-²] Answer: The current needed is ampere. (2 sig fig)arrow_forwardFill in the blanks: (7.13) Using a current of 4.75 A, how many minutes does it take to plate a sculpture with 1.50 g of Cu from a CuS04 solution? (Cu 63.546 g/mol) Analysis/Strategy: mass of Cu ® mol Cu ® mol e" (or Faraday) ® coulombs ® time in minutes (given current in amperes) Reduction half-reaction of copper solution to copper metal: Cu*2(aq) · + e¯ ® Cu(s) copper solution, CUSO4, has the ions: [Cu*2_SOq] Answer: The time needed to plate out a sculpture is minutes. (3 sig fig)arrow_forwardFill in the blanks: (7.14) In the electrolysis of CUSO4, how much copper is plated out on the cathode by a current of a 0.75A in 10 minutes? (Cu 63.546 g/mol) Analysis/Strategy: ampere & time coulombs ® mol e¯ (or Faraday) ® mol Cu (R mass of Cu Reduction half-reaction of copper solution to copper metal: Cu*²(aq) + e¯ ® Cu(s) copper solution, CUSO4, has the ions: [Cu*2 SOq] Answer: The mass of copper plated out is g Cu. (3 sig fig)arrow_forward
- (5.9: Similar to Example 5.14) Use oxidation states to identify the element that is oxidized and the element that is reduced in the reaction below. 2 Li(s) + Cl₂(g) --> 2 LiCl(s) oxidized element [Choose ] [Choose] Li reduced element CI No oxidized element exists. No reduced element exists.arrow_forwardThis is possible because of the following reactions that take place rapidly as long as reactants are available: (11.3) Equation : 51-(aq) + IO-3(aq) + 6H+(aq) ----> 3I2(aq) +3H2O(I)arrow_forwardFor cach of the following compounds, give the oxidation state of each element in the compound. 1. CoO b. HCIO NACIO C. Fe(10.) d. H,SO For the balanced chemical equation shown below, calculate the oxidation states of all the reactants and products. Identify the elements that are oxidized and reduced, and identify the oxidizers and reducers. How many electrons were transferred during the course of the reaction? CO:(g) 2F:(g) → CF(g) Ox(g)arrow_forward
- Complete the following equations by writing the formula(s) of the product(s) and balancing the equation with coefficients. Use the type of reaction to aid in determining the products. 6. 7. 8. 9. Balanced Equation 10. Zn + FeCl3 + 12. C3H8 + HgO→ 13. Al + H₂SO4 → AgNO3 → 0₂ Cl₂ → Balanced Equation 11. Iron and oxygen react to form iron (III) oxide. afe +302 afe 203 Type of Reaction Single Replacement Write the balanced chemical equation for the following chemical reactions. Include the correct formulas for all reactants and products and balance with coefficients. Identify the type of reaction in the right column. Double Replacement Combustions Decomposition Combination Silver nitrate and magnesium chloride react to form magnesium nitrate and silver chloride. 2Aguo3 + MgCl₂ → 2 Agcl + ing [Nosta double displacement Type of Reaction Compustion Aluminum reacts with copper (II) sulfate to form aluminum sulfate and copper solid. 3 cu 50₂ +2A1-3 Cu +3504 +2A¹a (564)3 single displacment 10arrow_forwardComplete the following equations by writing the formula(s) of the product(s) and balancing the equation with coefficients. Use the type of reaction to aid in determining the products. 6. 7. 8. 9. 10. Balanced Equation Zn + FeCl3 + C3H8 + HgO → Al + H₂SO4 → AgNO3 → 0₂ → 27 Type of Reaction Single Replacement Double Replacement Combustions Decomposition Write the balanced chemical equation for the following chemical reactions. Include the correct formulas for all reactants and products and balance with coefficients. Identify the type of reaction in the right column. Balanced Equation Combination Type of Reaction PDF ||| Oarrow_forward3. What does the sum of oxidation numbers need to equal for a charged compound? The charge on the compound Zero The largest oxidation number The smallest oxidation number GET IT NOW New version available! (3.0.220)arrow_forward
- (5.4) Which aqueous solution conducts electricity? O 1.0 M CH3CH₂OH O 2.0 M C12H22O11 O 1.5 M NH4CI O None of thesearrow_forward(5.7: Similar to For practice 5.11)The titration of a 20.0 mL sample of an H₂SO4 solution of unknown concentration requires 18.88 mL of a 0.203 M KOH to reach the equivalence point. What is the concentration (in M) of the unknown H₂SO4 solution? (Hint: Write the balanced reaction equation first.) O 0.0958 M O 0.383 M O 0.767 M O 0.192 Marrow_forward5.82 Consider the following two reactions:arrow_forward
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