which of the following elements is a noble gas
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HESI A2

HESI A2 Chemistry Questions

1. Which of the following elements is a noble gas?

Correct answer: C

Rationale: The correct answer is C: Argon. Argon is a noble gas, part of Group 18 in the periodic table. Noble gases are colorless, odorless, and typically non-reactive under normal conditions. Other elements in this group include helium, neon, krypton, xenon, and radon. Argon finds wide applications in welding, lighting, and scientific research. Choices A, B, and D are not noble gases. Hydrogen is a non-metal, Fluorine is a halogen, and Nitrogen is a diatomic non-metal gas.

2. Select the word that makes the following sentence grammatically correct: 'These days, you can’t ____ learning how to use a computer.'

Correct answer: D

Rationale: The correct answer is 'avoid.' The sentence requires a verb that means to stay away from something, making 'avoid' the appropriate choice. 'Evading' means avoiding or escaping something by deceit or cleverness, which is not the intended meaning here. 'Despite' is a preposition showing contrast, and 'not' is an adverb negating a verb or making it negative, so they do not fit the sentence structure.

3. A paroxysm is a sudden spasm. Another word for this might be

Correct answer: B

Rationale: The correct answer is B, 'Convulsion.' A paroxysm and a convulsion both refer to sudden, involuntary spasms. This makes 'Convulsion' the most suitable synonym. 'Symptom' (Choice A) refers to an indication of a condition but not a spasm. 'Efficacy' (Choice C) refers to the ability to produce a desired or intended result, unrelated to spasms. 'Embolism' (Choice D) refers to an obstruction in a blood vessel, not a sudden spasm.

4. If a parent changes their baby 6 times a day, how many diapers will be needed in a year?

Correct answer: A

Rationale: To calculate the number of diapers needed in a year with 6 diaper changes per day, multiply the daily diaper changes (6) by the days in a year (365): 6 x 365 = 2190 diapers required. This calculation ensures an ample supply of diapers for maintaining the infant's hygiene and comfort. The other choices are incorrect because they do not accurately account for the number of diaper changes per day multiplied by the days in a year. Choice B (2100 diapers) is too low, while choices C (2160 diapers) and D (2140 diapers) are too high based on the calculation. Understanding the frequency and quantity of diaper changes is crucial for supporting the infant's health and well-being. Therefore, the correct answer is 2190 diapers.

5. What word is best to substitute for the underlined words in the following sentence? Mr. Menotti’s wife collected Mr. Menotti’s belongings for the ride home.

Correct answer: D

Rationale: The word 'his' is the possessive form of the pronoun 'Mr. Menotti,' indicating that the belongings belong to him. Using 'her,' 'him,' or 'he' would not be grammatically correct in this context as they do not reflect the possession by Mr. Menotti. 'Her' would imply the belongings belong to his wife, 'him' is an objective pronoun, and 'he' is a subject pronoun, neither of which correctly shows possession.

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