2.5: Ideal Gasses

Question 1

Real vs ideal gas

Answer 1

Ideal is only theoretical, does not exist in reality

Question 2

When does a gas convert from ideal to real

Answer 2

When conditions vary from STP/SATP

Question 3

Characteristics of ideal gases (7)

Answer 3

• Gases made of molecules in constant random motion, traveling in straight lines
• Molecules behave as rigid spheres
• Pressure due to collisions between container walls and molecules
• All collisions are perfectly elastic (no less of Ek)
• Temp and avg Ek are proportional
• No intermolecular forces between molecules
• Volume occupied is negligible relative to volume of container, as particles are extremely small

Question 4

Ideal gas constant

Answer 4

8.31 kPa x vol in L / mol x temp in K

Question 5

Ideal gas formula

Answer 5

PV = nrT

Question 6

Real gases characteristics

Answer 6

• High pressure gets particles closer together, size becoming more important in relation to container size
• Collisions between particles are not entirely elastic
• Particles slow down and begin to attract at lower temps, possibly eventually turning from gas to liquid