what is the role of a catalyst in a chemical reaction
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HESI A2

Chemistry HESI A2 Quizlet

1. What is the role of a catalyst in a chemical reaction?

Correct answer: C

Rationale: A catalyst speeds up a chemical reaction by lowering the activation energy required for the reaction to occur. It does not get consumed in the reaction and remains unchanged at the end, allowing it to facilitate multiple reaction cycles. Choice A is incorrect because a catalyst actually speeds up the reaction. Choice B is incorrect because catalysts do have an effect by accelerating the reaction. Choice D is incorrect because catalysts do not stop the reaction, but rather increase the reaction rate.

2. Which word is used incorrectly in the following sentence? For whom was that email intended?

Correct answer: B

Rationale: The word 'whom' should be used instead of 'who' in the sentence to make it grammatically correct. 'Who' is used as the subject of a sentence, while 'whom' is used as the object. Therefore, the correct form of the sentence should be: 'For whom was that email intended?' Choices A, C, and D are used correctly in the sentence and do not need any changes.

3. How many ounces are in 3 quarts?

Correct answer: D

Rationale: There are 32 ounces in a quart. Therefore, 3 quarts would be equal to 3 quarts x 32 ounces = 96 ounces. The correct answer is D. Choice A, 64 ounces, is incorrect as it miscalculates the conversion from quarts to ounces. Choice B, 32 ounces, is the conversion for 1 quart, not 3 quarts. Choice C, 48 ounces, is also an incorrect calculation, not considering the correct conversion rate.

4. Select the meaning of the word 'spurious' in the sentence: 'The researcher’s spurious argument confused even the experts.'

Correct answer: A

Rationale: The word 'spurious' in this sentence means something that is false or not genuine. In this context, the researcher's argument was misleading or deceitful, confusing even the experts. 'Bogus' means not genuine or false, which aligns closely with the intended meaning of 'spurious.' The other choices, 'obscure,' 'baffling,' and 'outrageous,' do not capture the essence of being false or deceitful, making them incorrect in this context.

5. What does the word "surf" mean as used in the fourth paragraph?

Correct answer: B

Rationale: In the context of the passage, "surf" means to look at different websites.

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