SOLVED

1) Which statement does NOT explain the polarity of water? A) Oxygen is more electronegative than hydrogen. B) Water molecules have a bent geometry (V-shaped). C) The oxygen in water has sp2 hybrid orbitals. D) In water the hydrogen carries a partial positive charge (δ+). 2) The polarity of small molecules is a result of A) the presence of oxygen. B) the geometry of the bonds in the molecule. C) the polar covalent bonds. D) All of the above. E) B and C. 3) Which substance do you expect to be most soluble in water? A) Ammonia, NH3. B) Methane, CH4. C) Carbon dioxide, CO2. D) Nitrogen, N2. 4) Which is NOT a proper way to form a hydrogen bond? (The symbol “R” represents a general organic group. The hydrogen bonding is represented by dashed lines.) A) I B) II C) III D) IV 5) What is the maximum number of hydrogen bonds that one water molecule can have with neighboring water molecules? A) 1 B) 2 C) 3 D) 4 6) Which statement is true about hydrogen bonds between water molecules? A) They are about as strong as the covalent bonds in a water molecule. B) They arise because of the linear geometry of water. C) They cause water to have an unusually low freezing point for its molecular weight. D) They involve the unequal sharing of a proton between water molecules. E) In liquid water the same molecules attract to each other over long time periods. 7) The abundance of water in the cells and tissues helps to minimize temperature fluctuations. This is due to what property of water? A) Density. B) Viscosity. C) Specific heat. D) Boiling point. 8) Compounds that ionize when dissolved in water are called ________. A) electrolytes B) polar compounds C) hydrophobic compounds D) amphipathic compounds 9) Poorly soluble molecules such as lipids and nucleoside bases can be made more soluble in cells by attaching ________ to them. A) water B) oxygen C) carbohydrates D) salt ions 10) Electrolytes dissolve readily in water because A) they are held together by electrostatic forces. B) they are hydrophobic. C) water molecules can cluster about cations. D) water molecules can cluster about anions. E) water molecules can cluster about cations and anions. 1