Chapter 5: Gases

Question 1

Give the equation for pressure

Answer 1

Pa= force/ area = newtons/metres squared

Question 2

Who made the first barometer

Answer 2

Evangelist Torricelli

Question 3

State the pressure at sea levle

Answer 3

760 mmHg

Question 4

Give the manometer equations

Answer 4

pressure in torr

• Pgas = Patm - h (if atm is pushing in)
• Pgas = Patm + h (if gas is pushing out)

h = cm (if atmospheric pressure in atm) / 76 cm

Question 5

Define: Boyle’s Law

Answer 5

• pressure and volume are inversely proportional

• temperature and number of moles (n) are unchanged
• A plot of V vs 1/P should be a straight line with slope k and intercept of zero (y = mx + b)
• V inverse= 1/P
• V = k/P (k is a constant at a specific t)

Question 6

Define: ideal gas

- since k is constant….

Answer 6

a gas that strictly obeys Boyle’s law

- since k is constant P1V1 = k = P2V2

Question 7

Fill in the blank: for 1 mol of any gas at 298 K is exactly ____ L

Answer 7

22.41