Structure 1.5.1 : the ideal gas model

Question 1

Define the properties of an ideal gas

Answer 1

-consists of moving particles with negligible volume and no intermolecular (or attractive) forces
-all collisions are elastic (particles bounce w/o losing speed/energy)

real gases (non ideal) will deviate from this model; particularly at low temp + high P (low temp, high p = reduced volume =forcing the molecules closer tgt, causing an increase in intermolecular forces)

Question 2

Pressure + KMT(p & V, P & kinetic energy)

Answer 2

pressure increases, volume decreases (more collisions)

Temp increases, kinetic energy of particles increases (more frequent collisions with the walls of the container, hence increases pressure)

Question 3

Limitations of idea gas model

Answer 3

-V of gas particles is not negligible (the p is actually greater than predicted, and as a result the gas travels shorter distances)

-there are attractive forces b/w particles, making collisions less energetic +reducing pressure

Question 4

Define avogadro’s law/constant

Answer 4

the molar volume of a gas is constant at a particular pressure and temp

STP : 1 mol = 22.7 dm3

Question 5

Combined gas law formula

Answer 5

p1 v1 / t1 = p2 v2 / t2

Question 6

ideal gas law

Answer 6

Pv = n Rt

Question 7

units of pressure

Answer 7

Pa (goes with m3 for v), and kPa (goes w dm3 or L)

Question 8

celcius to Kelvin

Answer 8

k = C + 273.15