A major source of chlorine gas, Cl2, is from the electrolysis of brine, which is concentrated salt water, Which of the following is the balanced chemical reaction for this electrolysis reaction?
A. 2 NaCl (aq) + H2O ? 2 NaH (aq) + Cl2O (aq)
B. 2 NaCl (aq) + 2 H2O ? 2 Na (s) + O2 (g) + 2 H2 (g) + Cl2 (g)
C. 2 NaCl (aq) + H2O ? Na2O (aq) + 2 HCl (aq)
D. 2 NaCl (aq) + 2 H2O ? 2 NaOH (aq) + Cl2 (g) + 2 H2 (g)
Answer: D. 2 NaCl (aq) + 2 H2O ? 2 NaOH (aq) + Cl2 (g) + 2 H2 (g)
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Neglecting recoil of the gold nucleus, how much kinetic energy must an alpha particle (charge = 2 × 1.6 × 10^-19 C) have to approach to within 1.95 × 10^-14 m of a gold nucleus (charge = 79 × 1.6 × 10^-19 C)? (ke = 8.99 × 10^9 N×m2/C2 and 1 MeV = 1.6 × 10^-13 J)
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