12.2 Ideal Gas Basics and Boyle's Law

Question 1

What 4 variables do we have to consider when looking at behaviour of gases?

Answer 1

mass
pressure
volume
temperature

Question 2

How can we investigate how these quantities are related?

Answer 2

By keeping 2 constant while we see how others will vary?

Question 3

What is an ideal gas?

Answer 3

One which has internal energy depending only on the kinetic energy of the molecules - there is no potential energy?

Question 4

Is an ideal gas theoretical?

Answer 4

Yes

Question 5

What does an ideal gas obey?

Answer 5

The 3 gas laws - Boyles,Charles and Pressure

Question 6

What equation does an ideal gas obey? Under what conditions?

Answer 6

pV = NkT
or
pV = nRT
under all conditions of temperature and pressure

Question 7

What are the 3 laws we have to be aware of?

Answer 7

Boyle’s
Charles’
Pressure

Question 8

What relationship does Boyle’s Law describe?

Answer 8

Relationship between pressure and volume.

Question 9

What is kept the same in Boyle’s Law?

Answer 9

Mass and Temperature

Question 10

What does Boyle’s Law state?

Answer 10

That the pressure for a fixed mass of a gas is inversely proportional to volume provided that temperature is kept constant.

Question 11

Boyle’s Law numerically?

Answer 11

p = 1(k)/v

Question 12

What is the equation for Boyle’s Law when the gas undergoes changes?

Answer 12

p1v1 = p2v2

Question 13

Why does this equation exist?

Answer 13

As pv = constant, as p and v are inversely proportional.

Question 14

What does a a p against V graph look like?

Answer 14

http://www.schoolphysics.co.uk/age16-19/Thermal%20physics/Gas%20laws/text/Gas_laws/index.html

Question 15

What does a p against 1/v look like?

Answer 15

A straight line going through the origin

Question 16

What does a graph of pV against p or v look like?

Answer 16

Horizontal line from pV

Question 17

Why is it just a horizontal line?

Answer 17

As pV = constant and constant stays the same throughout

Question 18

If temperature was higher what would happen to a p against V graph?

Answer 18

It would move further away from the origin.

Question 19

If temperature was higher what would happen to a p against 1/V graph?

Answer 19

Would get steeper

Question 20

If temperature was higher what would happen to a p against 1/V graph?

Answer 20

The line would be higher. pV would be greater

Question 21

Why does pressure increase as volume decreses?

Answer 21

As molecules which are closer together are more likely to collide

Question 22

What do we assume when working with Boyle’s Law?

Answer 22

Density of fluid is uniform

mass and temperature are constant

Question 23

What is the meaning of isothermal

Answer 23

An isothermal process is a change of a system, in which the temperature remains constant: ΔT =0.

Question 24

Is boyle’s law isothermal?

Answer 24

Yes

Question 25

What is the setup for a practical investigating boyle’s law?

Answer 25

We have a bourdon gauge,oil reservoir, pump, a scale wit oil and air.

Question 26

Describe how this practical works?

Answer 26

The oil traps the air in the scale with a tube of fixed dimenstion.A tyre pump is used to increase the pressure as oil is pumped into the tube compressing the air, reducing the volume occupied by the air. Measuring the volume at 1atm , then graduallyu increasing pressure while keeping temperature and mass the same.Record