1. In an oxidation-reduction reaction, the number of electrons lost is(1) less than the number of electrons gained(2) less than the number of protons gained(3) equal to the number of electrons gained(4) equal to the number of protons gained2. The chemical process in which electrons are gained by an atom or an ion is called(1) addition(2) oxidation(3) reduction(4) substitution3. Which process occurs in an operating voltaic cell?(1) Electrical energy is converted to chemical energy.(2) Chemical energy is converted to electrical energy.(3) Oxidation takes place at the cathode.(4) Reduction takes place at the anode.4. Which energy conversion must occur in an operating electrolytic cell?(1) electrical energy to chemical energy(2) electrical energy to nuclear energy(3) chemical energy to electrical energy(4) chemical energy to nuclear energy5. Which term identifies the half-reaction that occurs at the anode of an operating electrochemical cell?(1) neutralization(2) transmutation(3) oxidation(4) reduction6. Half-reactions can be written to represent all(1) double-replacement reactions(2) neutralization reactions(3) fission and fusion reactions(4) oxidation and reduction reactions7. Which reaction occurs at the cathode in an electrochemical cell?(1) combustion(2) neutralization(3) oxidation(4) reduction8. When a voltaic cell operates, ions move through the(1) anode(2) cathode(3) salt bridge(4) external circuit9. Which statement is true about oxidation and reduction in an electrochemical cell?(1) Both occur at the anode.(2) Both occur at the cathode.(3) Oxidation occurs at the anode and reduction occurs at the cathode.(4) Oxidation occurs at the cathode and reduction occurs at the anode.10. What occurs when an electrolytic cell is used for silver-plating a spoon?(1) A chemical reaction produces an electric current.(2) An electric current produces a chemical reaction.(3) An oxidation reaction takes place at the cathode.(4) A reduction reaction takes place at the anode.11. Reduction occurs at the cathode in(1) electrolytic cells, only(2) voltaic cells, only(3) both electrolytic cells and voltaic cells(4) neither electrolytic cells nor voltaic cells12. What occurs when a magnesium atom becomes a magnesium ion?(1) Electrons are gained and the oxidation number increases.(2) Electrons are gained and the oxidation number decreases.(3) Electrons are lost and the oxidation number increases.(4) Electrons are lost and the oxidation number decreases.13. Which component of an electrochemical cell is correctly paired with its function?(1) external conductor – allows ions to flow(2) external conductor – permits electrons to flow(3) salt bridge – allows the solutions to mix(4) salt bridge – permits electrons to flow2Cr(s) + 3Cu²⁺(aq) → 2Cr³⁺(aq) + 3Cu(s)14. Given the balanced equation representing areaction: Which particles are transferred in this reaction?(1) electrons(2) neutrons(3) positrons(4) protons2 H₂O + electricity → 2 H₂ + O₂15. In which type of cell would this reaction most likely occur?(1) a chemical cell, because it is exothermic(2) an electrolytic cell, because it is exothermic(3) a chemical cell, because it is endothermic(4) an electrolytic cell, because it is endothermic16. What is the oxidation number of manganese in KMnO₄?(1) +7(2) +2(3) +3(4) +417. What is the oxidation number of chromium in the chromate ion, CrO₄²¯?(1) +2(2) +3(3) +6(4) +82Al(s) + 3Cu²⁺(aq) → 2Al³⁺(aq) + 3Cu(s)18. Given the balanced ionic equation below: Which half-reaction represents the reduction that occurs?(1) Al → Al³⁺ + 3e¯(2) Al³⁺ + 3e¯ → Al(3) Cu → Cu²⁺+ 2e¯(4) Cu²⁺ + 2e¯ → Cu19. Which metal will spontaneously react with Zn²⁺(aq), but will not spontaneously react with Mg²⁺(aq)?(1) Mn(s)(2) Cu(s)(3) Ni(s)(4) Ba(s)20. Which half-reaction correctly represents oxidation?(1) Mn⁴⁺ → Mn³⁺ + e¯(2) Mn⁴⁺ → Mn⁷⁺ + 3e¯(3) Mn⁴⁺ + e¯ → Mn⁷⁺(4) Mn⁴⁺ + 3e¯ → Mn⁷⁺21. Which equation shows conservation of charge?(1) Fe → Fe²⁺ + e¯(2) Fe → Fe²⁺ + 2e¯(3) Fe + e¯ → Fe²⁺(4) Fe + 2e¯ → Fe²⁺22. According to Reference Table J, which metal will react with Zn²⁺ but will not react with Mg²⁺?(1) Al(s)(2) Cu(s)(3) Ni(s)(4) Ba(s)23. Which is a redox reaction?(1) H²⁺ + Cl¯ → HCl(2) NaOH + HCl → NaCl + H₂O(3) Fe + 2HCl → FeCl₂ + H₂(4) MgO + H₂SO₄ → MgSO₄ + H₂O24. Which statement is true of electrode B when the switch is closed in this cell diagram?Captionless Image(1) B is the cathode, where oxidation is occurring(2) B is the cathode, where reduction is occurring(3) B is the anode, where oxidation is occurring(4) B is the anode, where reduction is occurring