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| 32. |
Most compounds containing primarily ionic bonds are by all of the following EXCEPT: |
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(A) |
High melting points |
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(B) |
Exist mainly in the gaseous state of matter |
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(C) |
An attraction between positive and negative ions |
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(D) |
Usually composed of a metal and nonmetal or polyatomic ion |
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(E) |
Most dissolve readily in water | |
Perhaps you're not sure which of the five answer choices is wrong. But you should be able to identify that choice C or D might be correct because of the word ion in the statement. See, you've already eliminated two possible answers and can make a pretty good guess from there.
If you’re interested, the answer is B: ionic compounds usually exist as crystalline solids, not gases, at room temperature.
“I, II, and III” Questions
As we discussed earlier, I, II, and III questions are multiple-choice questions that provide you with three possible answers, and the five answer choices list different combinations of those three.
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| 11. |
A student performed an experiment to determine the heat of neutralization of a strong acid with a strong base. Which of the following statements are true of this type of experiment? |
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I. The reaction is exothermic.
II. Energy for this reaction cannot be directly measured.
III. The specific heat must be calculated for the acid.
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(A) |
I only |
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(B) |
II only |
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(C) |
I and II only |
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(D) |
II and III only |
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(E) |
I, II, and III | |
There's an upside and a downside to questions of this type. Suppose, for example, that you know that in experiments involving heat of neutralization for acids and bases, you need to know the specific heat—and you suspect that you need the specific heat for the acid. This means that you can eliminate A, B, and C and significantly increase your chance of guessing the right answer. As long as you're not afraid to guess—and remember that you should never be afraid to guess if you've eliminated an answer—these questions shouldn’t be too daunting. By the way, the answer is E.
