HESI A2
HESI A2 Chemistry Questions
Question 1 of 5
What is the correct formula for potassium chloride?
Correct Answer: B
Rationale: The correct formula for potassium chloride is KCl. "K" represents potassium and "Cl" represents chloride. Potassium is a metal with a +1 charge, while chloride is a non-metal with a -1 charge. When these two ions combine, they form a neutral compound with a 1:1 ratio, resulting in the formula KCl. Choice A (NaCl) is incorrect because "Na" represents sodium, not potassium. Choice C (KCl) is also incorrect because it is the same as the correct answer. Choice D (ClK) is incorrect as the order of elements in a chemical formula matters, and in this case, it should be KCl to represent potassium chloride accurately.
Question 2 of 5
Which of these elements has the greatest atomic mass?
Correct Answer: D
Rationale: The correct answer is D: W (tungsten). Tungsten has the greatest atomic mass among the elements listed. Tungsten has an atomic number of 74, which corresponds to an atomic mass of approximately 183.84 g/mol. Gold (Au) has an atomic number of 79, with an atomic mass of around 196.97 g/mol, making it heavier than barium (Ba) and iodine (I). Barium has an atomic number of 56, with an atomic mass of about 137.33 g/mol, and iodine has an atomic number of 53, with an atomic mass of roughly 126.90 g/mol. Therefore, tungsten (W) has the greatest atomic mass compared to the other elements listed.
Question 3 of 5
What is the correct name of ZnSO₄?
Correct Answer: A
Rationale: The correct answer is A: Zinc sulfate. ZnSO₄ consists of zinc (Zn) and sulfate (SO₄) ions. The name of an ionic compound follows the pattern of cation name + anion name with appropriate suffixes. In this case, "sulfate" is the correct name for the polyatomic ion SO₄, so the compound is named zinc sulfate. Incorrect choices: B: Zinc sulfide - Sulfide is a different anion (S²⁻) than sulfate. C: Zinc sulfur - Incorrect as it doesn't specify the anion involved. D: Zinc oxide - Oxide is a different anion (O²⁻) than sulfate.
Question 4 of 5
What is the correct electron configuration for magnesium?
Correct Answer: C
Rationale: Failed to generate a rationale after 5 retries.
Question 5 of 5
What is the correct formula for potassium chloride?
Correct Answer: B
Rationale: The correct formula for potassium chloride is KCl. "K" represents potassium and "Cl" represents chloride. Potassium is a metal with a +1 charge, while chloride is a non-metal with a -1 charge. When these two ions combine, they form a neutral compound with a 1:1 ratio, resulting in the formula KCl. Choice A (NaCl) is incorrect because "Na" represents sodium, not potassium. Choice C (KCl) is also incorrect because it is the same as the correct answer. Choice D (ClK) is incorrect as the order of elements in a chemical formula matters, and in this case, it should be KCl to represent potassium chloride accurately.
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