1) Which of the following bonds is the most polar, that is has the greatest ionic character: H-Br, H-O, N-O, P-Cl?
2) For each of the following substances describe the importance of dispersion (London) forces, dipole-dipole interaction and hydrogen bonding. Explain briefly. HCl, Br2, IBr, HF, CH4.
3) Red brass is 85% Cu and 15% Zn by mass. What is the ratio of atoms in alloy?
4) Milk of magnesia is a suspension of Mg(OH)2 in water. It can be made by adding a base to a solution containing MgCl2. Suppose that 40 mL of 0.2 M NaOH solution is added to 25 mL of 0.3 M MgCl2 solution. What mass of Mg(OH)2 will be formed, and what will be the concentration of the ions in the solution of after the reaction complete?
MgCl2 (aq) + 2 NaOH (aq) à Mg(OH)2 (s) + 2NaCl