(B)Ammonia
(C)Hydrochloric acid
(D)Carbon dioxide
(E)Acetic acid
1. An organic solid with a low melting point
2. Acts as a weak base when bubbled into pure water
3. Would be the best choice of the above to neutralize excess NaOH
For instance, if you're pretty sure that ammonia, hydrochloric acid, and acetic acid are not organic solids, just from your general knowledge of chemistry, then you can eliminate B, C, and E. This helps you narrow the answer choices down to two, and if you have to guess, you have a 50-50 chance of choosing the correct answer. Another point that may help you guess in a pinch is that you’ll rarely find the same answer choice being correct for two different questions. True, the directions for classification questions explicitly state that an answer choice “may be used once, more than once, or not at all,” but on the whole, the ETS people shy away from the “more than once” possibility. This is by no means a sure bet, but if you're trying to eliminate answers, you might want to eliminate those choices that you’ve already used on other questions in the same set. If you’re wondering, the answers to the above questions are 1 A, 2 B, and 3 C. “EXCEPT”-Type Questions “EXCEPT” questions are five-choice multiple-choice questions that contain a bunch of right answers and one wrong answer. The questions always contain an all-caps EXCEPT, LEAST, or some other similar word. Even if you aren't sure of the answer, you should be able to identify one or two of the answer choices as being true statements and eliminate them.
32. Most compounds containing primarily ionic bonds are characterized by all of the following EXCEPT:
(A)High melting points
(B)Exist mainly in the gaseous state of matter
(C)An attraction between positive and negative ions
(D)Usually composed of a metal and nonmetal or polyatomic ion
(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.
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?
I. The reaction is exothermic.
II. Energy for this reaction cannot be directly measured.
III. The specific heat must be calculated for the acid.英语作文
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