HESI A2
HESI A2 Chemistry Questions
1. What is the name of the device that separates gaseous ions by their mass-to-charge ratio?
- A. mass spectrometer
- B. interferometer
- C. magnetometer
- D. capacitance meter
Correct answer: A
Rationale: A mass spectrometer is a device specifically designed to separate gaseous ions based on their mass-to-charge ratio. This separation process involves ionization, acceleration of the sample, and the deflection of ions in a magnetic field according to their mass-to-charge ratio. The other options, 'interferometer,' 'magnetometer,' and 'capacitance meter,' do not perform the specific function of separating gaseous ions based on their mass-to-charge ratio, making them incorrect choices.
2. Which element has the chemical symbol 'Fe'?
- A. Lead
- B. Iron
- C. Silver
- D. Copper
Correct answer: B
Rationale: The correct answer is 'Iron' as it has the chemical symbol 'Fe'. Chemical symbols are used to represent elements in the periodic table, and 'Fe' specifically refers to Iron. Choice A, Lead, is incorrect as the chemical symbol for Lead is 'Pb'. Choice C, Silver, is incorrect as the chemical symbol for Silver is 'Ag'. Choice D, Copper, is incorrect as the chemical symbol for Copper is 'Cu'. Therefore, 'Iron' is the only element among the choices with the chemical symbol 'Fe'.
3. Which of the following is a characteristic of a chemical change?
- A. Change in shape
- B. Production of gas
- C. Melting
- D. Freezing
Correct answer: B
Rationale: The production of gas is a characteristic of a chemical change. During a chemical change, new substances are formed, often with the release or absorption of energy. The production of gas is a significant indicator of a chemical change because it indicates the formation of new compounds through chemical reactions. Choices A, C, and D are not characteristics of chemical changes. Changes in shape, melting, and freezing are physical changes where the substance's identity remains the same, unlike in chemical changes where new substances with different properties are formed.
4. 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.
5. Which material has the smallest specific heat capacity?
- A. water
- B. wood
- C. aluminum
- D. glass
Correct answer: C
Rationale: Specific heat capacity is the amount of heat required to raise the temperature of a unit mass of a substance by one degree Celsius. Among the options provided, aluminum has the smallest specific heat capacity. This means that it requires the least amount of heat to raise its temperature compared to water, wood, and glass. Water has a high specific heat capacity, making it resistant to temperature changes, while wood and glass have higher specific heat capacities compared to aluminum.
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