Study of Gas Laws
ICSE · Class 9 · Chemistry
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What happens to the volume of a gas when pressure is doubled at constant temperature?
What is the value of absolute zero?
A gas occupies 100 mL at 760 mm Hg. What volume will it occupy at 380 mm Hg at the same temperature?
Which graph represents Boyle's Law?
Sample Questions
Which of the following are characteristics of gases?
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No fixed shape, No fixed volume, Highly compressible
Gases have no fixed shape or volume, are highly compressible due to large inter-particle spaces, and have low density with particles far apart.
Convert 27°C to Kelvin scale.
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300 K
To convert Celsius to Kelvin, add 273 to the Celsius value. So, 27°C + 273 = 300 K. Kelvin values are written without the degree sign.
At constant pressure, volume of a gas is directly proportional to temperature.
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True
This is Charles's Law - at constant pressure, volume is directly proportional to absolute temperature (V ∝ T).
Standard Temperature and Pressure (STP) conditions are:
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0°C and 760 mm Hg, 273 K and 1 atm, 0°C and 76 cm Hg
Standard temperature and pressure are given in the chapter as 0°C or 273 K for temperature and 1 atmospheric unit (atm) or 760 mm Hg for pressure. Since 1 atm is also equal to 76 cm Hg, that pair is included as well. The other options do not match the standard conditions stated for STP.
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