HESI A25
HESI A2 Chemistry Practice Test
1. The volume of a gas is directly proportional to its absolute temperature at constant pressure. This is a statement of:
- A. Combined Gas Law
- B. Boyle's Law
- C. Charles' Law
- D. The Ideal Gas Law
Correct answer: C
Rationale: Charles' Law states that the volume of a gas is directly proportional to its absolute temperature at constant pressure. This means that as the temperature of a gas increases, its volume also increases proportionally, and vice versa. This relationship between temperature and volume is a key feature of Charles' Law. The Combined Gas Law involves the relationships between pressure, volume, and temperature of a gas. Boyle's Law describes the inverse relationship between the pressure and volume of a gas at constant temperature. The Ideal Gas Law combines Boyle's Law, Charles' Law, and Avogadro's Law into a single expression. Therefore, the correct answer is Charles' Law, as it specifically describes the direct relationship between the temperature and volume of a gas.