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HESI A2 chemistry practice questions, set 11

HESI A2 · chemistry

HESI A2 chemistry practice questions set 11

You work the formulas, bonds, and reactions that show up on HESI science modules. Five of the 15 questions include the correct answer and rationale. The other ten keep answers in the study hub. Continue with the HESI A2 exam guide or more HESI A2 practice questions.

Five chemistry questions with answers

Cover the key. Write the first action. Then open the rationale and name why the other choices fail.

Question 1

What is the typical oxidation state of oxygen in most compounds?

  1. A. -1
  2. B. -2
  3. C. 0
  4. D. -3
Show answer and rationale

Correct answer: B — -2

The correct answer is B: "-2". Oxygen usually exhibits an oxidation state of -2 in most compounds. This is due to oxygen's high electronegativity, which causes it to attract electrons, leading to the gain of two electrons in chemical reactions. Choice A (-1) is incorrect because oxygen rarely has an oxidation state of -1 in compounds. Choice C (0) is incorrect as oxygen does not usually have an oxidation state of zero in compounds. Choice D (-3) is incorrect as oxygen does not commonly have an oxidation state of -3 in compounds.

Question 2

The three important allotropic forms of phosphorus are red, white, and ___________.

  1. A. green
  2. B. gray
  3. C. black
  4. D. silver
Show answer and rationale

Correct answer: C — black

The three important allotropic forms of phosphorus are red, white, and black. These forms indicate the different physical properties and reactivity of phosphorus under various conditions. Red phosphorus is more stable and less reactive than white phosphorus, while black phosphorus is the least reactive form. Choice C, 'black,' is the correct answer as it completes the sequence of allotropic forms of phosphorus. Choices A, 'green,' B, 'gray,' and D, 'silver,' are incorrect as they do not represent recognized forms of phosphorus.

Question 3

What number represents the number of protons an element has?

  1. A. Atomic mass
  2. B. Mass number
  3. C. Atomic number
  4. D. Neutron number
Show answer and rationale

Correct answer: C — Atomic number

The correct answer is C, atomic number. The atomic number corresponds to the number of protons in an element. This number is unique to each element and determines its placement on the periodic table. It is equal to the number of protons found in the nucleus of an atom of that element. Choice A, atomic mass, represents the average mass of an element's isotopes. Choice B, mass number, is the sum of protons and neutrons in an atom. Choice D, neutron number, specifically refers to the count of neutrons in an atom and not protons.

Question 4

Beta radiation is the product of the decomposition of which particle?

  1. A. Proton
  2. B. Neutron
  3. C. Electron
  4. D. Photon
Show answer and rationale

Correct answer: B — Neutron

Beta radiation is the result of the decomposition of a neutron. During beta decay, a neutron in an atom's nucleus is transformed into a proton, an electron (beta particle), and an antineutrino. Therefore, the correct answer is 'Neutron.' Choice A, 'Proton,' is incorrect because beta decay does not involve the decomposition of a proton. Choice C, 'Electron,' is incorrect because electrons are actually produced during beta decay. Choice D, 'Photon,' is incorrect as beta radiation does not involve the decomposition of photons.

Question 5

Why does fluorine have a higher ionization energy than oxygen?

  1. A. Fluorine has a smaller number of neutrons.
  2. B. Fluorine has a larger number of neutrons.
  3. C. Fluorine has a smaller nuclear charge.
  4. D. Fluorine has a larger nuclear charge.
Show answer and rationale

Correct answer: D — Fluorine has a larger nuclear charge.

Fluorine has a higher ionization energy than oxygen because fluorine has a larger nuclear charge. The greater number of protons in the nucleus of fluorine attracts its electrons more strongly, making it harder to remove an electron from a fluorine atom compared to an oxygen atom. Choice A is incorrect as the number of neutrons does not directly affect ionization energy. Choice B is also incorrect for the same reason. Choice C is incorrect because a smaller nuclear charge would result in lower ionization energy, not higher.

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Question 6

Carbon-12 and carbon-14 are isotopes. What do they have in common?

  1. A. Number of nuclear particles
  2. B. Number of protons
  3. C. Number of neutrons
  4. D. Mass number
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Question 7

What is the correct formula for potassium chloride?

  1. A. NaCl
  2. B. KCl
  3. C. KCl
  4. D. ClK
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Question 8

What is the net charge of an ionic compound?

  1. A. 0
  2. B. -1
  3. C. +1
  4. D. Variable
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Question 9

What is the name of the process by which a gas turns into a liquid?

  1. A. Sublimation
  2. B. Condensation
  3. C. Evaporation
  4. D. Deposition
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Question 10

Which substance forms hydroxide ions when placed in water?

  1. A. Lemon juice
  2. B. Battery acid
  3. C. Vinegar
  4. D. Lye
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Question 11

What is the correct formula for iron III oxide?

  1. A. IO
  2. B. FeS
  3. C. Fe₂O₃
  4. D. OFe₂₃
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Question 12

How many electron pairs are shared to form a triple covalent bond?

  1. A. 1
  2. B. 2
  3. C. 3
  4. D. 4
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Question 13

How many electrons are in a neutral atom of neon?

  1. A. 9
  2. B. 10
  3. C. 11
  4. D. 12
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Question 14

Radioactive isotopes are frequently used in medicine. What kind of half-life would a medical isotope probably have?

  1. A. Seconds-long
  2. B. Days-long
  3. C. Years-long
  4. D. Many years long
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Question 15

What is the name of the phase change from liquid to gas?

  1. A. Condensation
  2. B. Sublimation
  3. C. Evaporation
  4. D. Melting
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About these HESI A2 chemistry questions

HESI A2 chemistry practice questions, set 11 for nursing students in the United States. Fifteen items. Five include answers and rationales in American English.

No. Nursier is independent practice. Register through the official path named on the HESI A2 exam guide.

The first five questions already include the rationale. Start full practice to unlock the remaining keys, missed-question review, and the rest of the bank.

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Missed-question review, longer banks, and the rest of 20,000+ nursing practice questions open when you start studying.

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