Exam-style question
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If the volume of a gas is reduced to half its original value while the temperature remains constant, what happens to the pressure?.
- A.Pressure remains the same
- B.Pressure doubles
- C.Pressure halves
- D.Pressure quadruples
Model answer
What a good answer should say
- Pressure doubles.
Explanation
Why this works
Formula/rule: P1V1 = P2V2. Substitution: V2 = V1/2.
Working: P2 = P1V1/(V1/2) = 2P1. Answer: Pressure doubles.
Units/Conclusion: The pressure increases by a factor of two (e.g., from 1.0 atm to 2.0 atm).
Common mistake
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