6. What species are produced at the positive and negative electrodes during the electrolysis of molten sodium chloride? Negative electrode Positive electrode Cl2(g) Na+(l) A. Na+(l) Cl–(l) B. Cl2(g) Na(l) C. Na(l) Cl2(g) D. (Total 1 mark) 7. Consider the following reaction. H2SO3(aq) + Sn4+(aq) + H2O(l) Sn2+(aq) + HSO4–(aq) + 3H+(aq) Which statement is correct? A. H2SO3 is the reducing agent because it undergoes reduction. B. H2SO3 is the reducing agent because it undergoes oxidation. C. Sn4+ is the oxidizing agent because it undergoes oxidation. D. Sn4+ is the reducing agent because it undergoes oxidation. (Total 1 mark) 8. In which change does oxidation occur? A. CH3CHO CH3CH2OH → B. CrO42–→ Cr2O72– C. SO42–→ SO32– D. NO2– NO3– → 9. A voltaic cell is made from copper and zinc half-cells. The equation for the reaction occurring in the cell is Zn(s) + Cu2+(aq) Zn2+(aq) + Cu(s) → Which statement is correct when the cell produces electricity? A. Electrons are lost from zinc atoms. B. The mass of the copper electrode decreases. C. Electrons flow from the copper half-cell to the zinc half-cell. D. Negative ions flow through the salt bridge from the zinc half-cell to the copper half-cell. 10. What are the oxidation numbers of the elements in the compound phosphoric acid, H3PO4?
6. What species are produced at the positive and negative electrodes during the electrolysis of molten sodium chloride? Positive electrode Negative electrode A. Na+(l) Cl2(g) B. Cl–(l) Na+(l) C. Na(l) Cl2(g) D. Cl2(g) Na(l) (Total 1 mark) 7. Consider the following reaction. H2SO3(aq) + Sn4+(aq) + H2O(l) Sn2+(aq) + HSO4–(aq) + 3H+(aq) Which statement is correct? A. H2SO3 is the reducing agent because it undergoes reduction. B. H2SO3 is the reducing agent because it undergoes oxidation. C. Sn4+ is the oxidizing agent because it undergoes oxidation. D. Sn4+ is the reducing agent because it undergoes oxidation. (Total 1 mark) 8. In which change does oxidation occur? A. CH3CHO → CH3CH2OH B. CrO42–→ Cr2O72– C. SO42–→ SO32– D. NO2– → NO3– 9. A voltaic cell is made from copper and zinc half-cells. The equation for the reaction occurring in the cell is Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s) Which statement is correct when the cell produces electricity? A. Electrons are lost from zinc atoms. B. The mass of the copper electrode decreases. C. Electrons flow from the copper half-cell to the zinc half-cell. D. Negative ions flow through the salt bridge from the zinc half-cell to the copper half-cell. 10. What are the oxidation numbers of the elements in the compound phosphoric acid, H3PO4?
ib_chemistry_1st_year_review_summer_assign_yr_1___yr_2summer_2018.docx