HESI A2
Chemistry HESI A2 Practice Test Questions
Question 1 of 5
Radioactive isotopes are frequently used in medicine. What kind of half-life would a medical isotope probably have?
Correct Answer: B
Rationale: The correct answer is B: Days-long. Medical isotopes used in medicine typically have a short half-life to minimize radiation exposure to patients. A days-long half-life strikes a balance between decay rate and practical usability in medical procedures. Choice A (Seconds-long) would be too short for practical use. Choices C (Years-long) and D (Many years long) would result in prolonged radiation exposure, increasing health risks for patients.
Question 2 of 5
Which of the following pH values is most likely for lemon juice?
Correct Answer: A
Rationale: The correct answer is A (pH 3) for lemon juice. Lemon juice is acidic due to citric acid content, resulting in a low pH value. The pH scale ranges from 0-14, with 7 being neutral. Lemon juice with a pH of 3 is considered highly acidic. Choice B (pH 5) is less acidic than choice A. Choice C (pH 7) is neutral, which is not characteristic of lemon juice. Choice D (pH 9) is alkaline, opposite to the acidity of lemon juice. Lemon juice's low pH value contributes to its sour taste and preservation properties.
Question 3 of 5
What is an alloy in which another metal is dissolved in mercury (Hg) called?
Correct Answer: B
Rationale: The correct answer is B: Amalgam. An amalgam is an alloy where mercury (Hg) is the solvent and another metal is dissolved in it. This is a common dental material. Electrum (A) is a natural alloy of gold and silver. Solder (C) is a metal alloy used to join other metals. Bronze (D) is an alloy of copper and tin.
Question 4 of 5
Which element would you expect to be least reactive?
Correct Answer: D
Rationale: The correct answer is D: Xe. Xenon (Xe) is a noble gas, meaning it has a full outer electron shell, making it highly stable and least likely to react with other elements. Li (A) is a highly reactive alkali metal, Cr (B) is a transition metal with varying reactivities, and Nd (C) is a rare-earth metal that can exhibit reactivity. In summary, Xe is the least reactive as noble gases tend to be chemically inert due to their stable electron configuration.
Question 5 of 5
What is the normal body temperature in Fahrenheit?
Correct Answer: B
Rationale: Failed to generate a rationale after 5 retries.
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