Gas laws

Question 1

absolute 0

Answer 1

• 0K
• minimum KE

Question 2

boyle law

Answer 2

• pV = constant
• e.g. if you reduce volume its particles will be closer together and collide with each other and the container more often

Question 3

charles’ law

Answer 3

V / T = constant

Question 4

pressure law

Answer 4

p / T = constant

Question 5

investigate boyles law

Answer 5

• oil traps pocket of air in sealed tube of fixed dimension
• tyre pump used to increase pressure
• Bourdon gauge records pressure
• as pressure increases more oil pushed into the tube
  
  • oil level rise and air will compressed
  • volume occupied by air reduced
• measure volume of air at atmospheric pressure, and slowly increase pressure, note both pressure and volume as it changes
• product of these should be constant
• plot a graph of p again 1 / V, should be straight line

Question 6

consideration investigating boyles law?

Answer 6

• changes in pressure should be made slowly , and time allowed for thermal equilibrium to be reached
• important to avoid excessive pressure and ensure connection are secure to prevent high pressure oil spray

Question 7

investigate Charles’s Law?

Answer 7

• capillary tube sealed at the bottom
  
  • contains drop of conc sulfirc acid half way up tube
  • traps a column of air between the bottom of the tube and the acid drop
• the beaker is filled with boiling water
• as water cools length of the column decreases
• record temp regularly and column length
• repeat twice
• plot length against temp, straight line
  
  • volume proprotional to length