HESI A2
HESI A2 Chemistry Practice Test
1. At what temperature does water boil in °F?
- A. 210°F
- B. 212°F
- C. 215°F
- D. 220°F
Correct answer: B
Rationale: Water boils at 212°F under standard atmospheric pressure. This is the point at which water changes from a liquid to a gas phase. Choice A (210°F) is incorrect as it is below the boiling point of water. Choice C (215°F) and Choice D (220°F) are also incorrect as they are above the boiling point of water.
2. What is the typical oxidation state of oxygen in most compounds?
- A. -1
- B. -2
- C. 0
- D. -3
Correct answer: B
Rationale: 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.
3. Which of the following is defined as the number of cycles of a wave that move past a fixed observation point per second?
- A. Wave
- B. Wavelength
- C. Frequency
- D. Wavefunction
Correct answer: C
Rationale: Frequency is defined as the number of cycles of a wave that pass a fixed observation point per second. It is a fundamental characteristic of a wave and is measured in Hertz (Hz). The frequency of a wave determines its pitch in the case of sound waves and its color in the case of light waves. Choice A, 'Wave,' is incorrect because a wave refers to the disturbance or oscillation that travels through a medium. Choice B, 'Wavelength,' is incorrect as it represents the distance between two corresponding points on a wave (e.g., crest to crest). Choice D, 'Wavefunction,' is not the correct answer as it is a mathematical function used in quantum mechanics to describe the behavior of particles and systems.
4. What type of starch is glycogen?
- A. Plant starch
- B. Animal starch
- C. Glucose
- D. Cellulose
Correct answer: B
Rationale: Glycogen is classified as animal starch, not plant starch. It is the storage form of glucose in animals, primarily found in the liver and muscles. Choice A (Plant starch) is incorrect because glycogen is not derived from plants. Choice C (Glucose) is incorrect as glucose is a monosaccharide and not a type of starch. Choice D (Cellulose) is incorrect as cellulose is a structural polysaccharide found in plant cell walls, not the same as glycogen.
5. How are elements arranged in the periodic table?
- A. Order of increasing atomic number
- B. Alphabetical order
- C. Order of increasing metallic properties
- D. Order of increasing neutron content
Correct answer: A
Rationale: In the periodic table, the elements are arranged in order of increasing atomic number. This organization is based on the number of protons in the nucleus of each element. It provides a systematic way to classify elements and predict their properties. Knowing the atomic number of an element helps determine its placement in the periodic table and its characteristics. Therefore, the correct answer is the order of increasing atomic number as it is fundamental to the structure and properties of the elements. Choices B, C, and D are incorrect. Alphabetical order does not reflect any underlying property of the elements, metallic properties vary across the table, and neutron content alone is not the basis for the arrangement in the periodic table.
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