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Which of these best explains why the hydrogen atoms in a water molecule are attracted to Cl− ions in sodium chloride (NaCl)?
The hydrogen atoms have +1 charges.
The hydrogen atoms share electrons equally with the oxygen atom.
The hydrogen atoms have partial positive charges.
The hydrogen atoms form covalent bonds with the chloride ions.
Points earned on this question: 2
Question 2 (Worth 2 points)
Which of the following would most likely happen if water did not form hydrogen bonds?
Water would exist only as a solid.
Water would be able to dissolve all ionic compounds.
Water would not expand when it freezes.
Water would not exist on Earth.
Points earned on this question: 2
Question 3 (Worth 2 points)
Areas near oceans or large lakes tend to have more moderate climates than do areas far from large bodies of water. Which of these statements best explains this observation?
Hydrogen and oxygen atoms share electrons in a water molecule.
Lakes and oceans contain dissolved solids.
Water has a very high specific heat.
Water produces buoyant forces.
Points earned on this question: 2
Question 4 (Worth 2 points)
Which of these best explains why a paper clip can float on water?
Water has a very high specific heat.
Water molecules at the surface experience fewer hydrogen bonds than water molecules within the liquid.
The metal in the paper clip has a lower mass than the water.
Water molecules near the surface produce more buoyant force than water molecules within the liquid.
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