HESI A2
HESI A2 Chemistry Questions
1. How can water be boiled at room temperature?
- A. By lowering the pressure
- B. By increasing the pressure
- C. By decreasing the volume
- D. By raising the boiling point
Correct answer: A
Rationale: The boiling point of water is directly affected by pressure. By lowering the pressure, water can boil at a lower temperature, even at room temperature. This occurs because at lower pressures, the molecules of water have less resistance to escaping into the vapor phase, thus enabling boiling to occur at lower temperatures. Choices B, C, and D are incorrect because increasing the pressure, decreasing the volume, or raising the boiling point would actually require higher temperatures to boil water rather than achieving boiling at room temperature.
2. Which of the following is a property of an acid?
- A. Bitter taste
- B. Slippery feel
- C. Reacts with bases
- D. Sweet taste
Correct answer: C
Rationale: The correct property of an acid is that it 'reacts with bases.' Acids are known for their ability to react with bases to form salts and water through a process called neutralization. This unique reaction distinguishes acids from other substances and is a fundamental characteristic of acids in chemistry. Choices A, B, and D are incorrect. Acids do not have a bitter taste (Choice A), a slippery feel (Choice B), or a sweet taste (Choice D). These properties are not typical of acids and may lead to confusion if associated with acids.
3. Which of the following elements is a halogen?
- A. Oxygen
- B. Fluorine
- C. Sodium
- D. Carbon
Correct answer: B
Rationale: The correct answer is 'Fluorine' (Choice B) as it is a halogen. Halogens are a group of elements that include fluorine, chlorine, bromine, iodine, and astatine. They are highly reactive nonmetals located in Group 17 of the periodic table. Oxygen (Choice A) is a nonmetal but not a halogen. Sodium (Choice C) is a metal, and Carbon (Choice D) is a nonmetal, neither of which belong to the halogen group.
4. Which gas is produced when an acid reacts with a carbonate?
- A. Carbon dioxide
- B. Oxygen
- C. Hydrogen
- D. Nitrogen
Correct answer: A
Rationale: When an acid reacts with a carbonate, the chemical reaction typically yields carbon dioxide gas. Carbon dioxide is formed due to the chemical reaction between the acid and the carbonate, releasing this gas as a product. Therefore, the correct answer is 'Carbon dioxide.' Choices B, C, and D are incorrect as oxygen, hydrogen, and nitrogen are not the gases produced in this specific acid-carbonate reaction.
5. What is the mass number of an atom with 6 protons, 6 neutrons, and 6 electrons?
- A. 12
- B. 18
- C. 6
- D. 8
Correct answer: A
Rationale: The mass number of an atom is the sum of protons and neutrons. In this case, the atom has 6 protons and 6 neutrons, thus the mass number is 6 + 6 = 12. Therefore, choice A (12) is the correct answer. Choices B (18), C (6), and D (8) are incorrect because the mass number is determined by the sum of protons and neutrons, not the number of electrons or a different combination of particles.
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