1.Vocab
2.Vocab
3.Vocab
4. Describe what happens to the boiling point of a substance as you ascend a mountain. Use the words atmospheric pressure, vapor pressure and boiling point in your response.
As you climb a mountain the atmospheric pressure decreases. The boiling point is the temperature when the vapor pressure of the liquid is equal to the atmospheric pressure. The boiling point will decrease as you climb higher because it takes less energy for the vapor pressure to be equal to the new, lower atmospheric pressure.
5. Draw the particle diagrams for a solid, liquid and gas. Use circles to represent the particles and your diagrams must contain at least 6 particles.
Physical Constant Conversions.
1. Convert 36.5 kilojoules (kJ) to joules (J)
36.5 kJ x (1000 J / 1 kJ) = 36,500 J
2. Convert 37° Celsius (C) to Kelvin (K).
K = OC + 273 K = 37 + 273 = 310 k
3. Convert 3.6 atmospheres (atm) to kilopascals (kPa) and to torr.
3.6 atm X ( 101.3 kPa/1 atm) = 365 kPa
3.6 atm X (760 torr/ 1 atm) = 2736 torr
____2___ 1. As the temperature of a sample of H2O(l) decreases, the average kinetic energy of its molecules will
(1) Increase (2) Decrease (3) Remain the same
_____1____ 2. As ice melts, its temperature remains the same at 0°C until it has completely melted. Its potential
energy:
(1) Increases (2) Decreases (3) Remains the same
_____2____ 3. Which change of phase is exothermic?
(1) Solid to liquid (2) liquid to solid (3) solid to gas (4) liquid to gas
_____1____ 4. Which substance has vibrating particles in regular fixed positions?
(1) Ca(s) (2) Hg (l) (3) Cl2 (g)
_____1____ 5. Which temperature is equal to +20K?
(1) -253°C (2) +253°C (3) -293°C (4) -303°C
_____1____ 6. The temperature of a sample of water is changed from 10°C to 30°C. The same change in Kelvin
degrees would be:
(1) 20 (2) 100 (3) 273 (4) 303
_____2____ 7. When the vapor pressure of a liquid is equal to the atmospheric pressure, the liquid will
(1) Freeze (2) Boil (3) Melt (4) Condense
_____3____ 8. When the vapor pressure of water is 30 kPa, the temperature of the water is
(1) 20°C (2) 40°C (3) 70°C (4) 100°C
_____2____ 9. As the temperature of a liquid increases, its vapor pressure
(1) Decreases (2) Increases (3) Remains the same
_____3____ 10. Which substance has the weakest intermolecular forces
(1) Ethanoic acid (2) Ethanol (3) Propanone (4) Water
______1___ 11. As water in a sealed container is cooled from 20°C to 10°C, its vapor pressure
(1) Decreases (2) Increases (3) Remains the same
______2___ 12. As the atmospheric pressure increases, the temperature at which water will boil in an open
container:
(1) Decreases (2) Increases (3) Remains the same
_____3____ 13. The amount of heat required to change 1 gram of solid to 1 gram of liquid at a constant
temperature is called its heat of:
(1) vaporization (2) sublimation (3) fusion
_____1____ 14. The phase change represented by the equation I2(s) ----> I2(g) is called
(1) sublimation (2) condensation (3) melting (4) boiling
_____4____ 15. Under the same conditions of temperature and pressure, a liquid differs from a gas because the particles of the liquid
(1) are in constant straight-line motion
(2) take the shape of the container they occupy
(3) have no regular arrangement
(4) have stronger forces of attraction between them
Calculate the pressure of the gas in each of the following mercury manometers.
Show all of your work.
1. An ice fisher wants to eat steamed fish for lunch. He puts 112g of ice at -30 OC in a pot and puts it over a fire. The fire delivers 1000 kJ of heat per minute. How much energy must be added until all of the ice is converted into steam?
(ΔHfus = 334 J/g; ΔHvap = 2260 J/g; cice = 2.06 J/g°C; cvapor = 1.97 J/g°C)
q 1= m cice ∆T q 1 = 112 g ● 2.06 J/g°C ● 30 OC q 1 = 6,921.6 J
q 2 = m ∆Hf q 2 = 112 g ● 334 J/g q 2 = 37,408 J
q 3 = m cwater ∆T q 3 = 112 g ● 4.18 J/g°C ● 100 OC q 3 = 46,816 J
q 4 = m ∆Hv q 4 = 112 g ● 2260 J/g q 4 = 253,120 J
q total = q1 + q2 + q3 + q4
q total = 6921.6 J + 37408 J + 46816 J + 253120 J = 344,000 J