When a substance goes through sublimation, is energy added or removed?
Energy is added
100
What is the change in temperature, if a 70.0 gram sample of nickel absorbs 1756 J of energy? Nickel has a specific heat of 0.440 J/g °C.
57 degrees celsius
100
During a storm, the power goes out at Johan’s house. His mother strikes a match to light a candle. As the match burns, it gives of light energy. What other form of energy does the burning match give off?
Thermal
100
A sample of gas is held at constant pressure. Increasing the temperature of the gas sample causes the average kinetic energy of the molecules to _____? What happens to volume?
increase, and the volume of the gas sample to increase
100
Convert 114g C to moles of C
9.5 moles C
200
What is the name of the phase change when energy goes from gas to solid?
Deposition
200
How many joules of heat is needed to heat 68.00 grams of aluminum foil from 55.00 °C to 93.00 °C if aluminum has a specific heat of 0.90 J/g °C.
2326 Joules
200
Joe just installed solar panels on the top of his house to provide electricity. What kind of energy transformation will take place?
Radiant --> Electrical --> Thermal + Radiant
200
A sample of gas in a syringe has a volume of 9.66 mL at a pressure of 64.4 kPa. The plunger is depressed until the pressure is 94.6 kPa. What is the new volume, assuming constant temperature?
6.58mL
200
Convert 13.6 mol NaCl to grams
503.2 grams
300
Which process decreases enthalpy?
Boiling of water
Condensation of Ethanol Vapor
Melting of Copper
Sublimation of Iodine
Condensation of Ethanol Vapor
300
A 126-gram sample of titanium metal is heated from 20.0°C to 45.4°C while absorbing 1.68 kJ of heat. (1kJ = 1000J) What is the specific heat of titanium?
.525 J/g C
300
A ball is sitting at the top of 300km mountain. When the ball begin to fall it exhibits ______ energy. But, when it is sitting at the top of the mountain it exhibits ________.
Kinetic Energy, Potential Energy
300
A sample of nitrogen gas goes from 21 mL to 14 mL and its pressure increases from 100 kPa to 150 kPa. The final temperature is 300 K. What was the initial temperature in Kelvins?
300K
300
Convery 950 mmHg to atm
1.25atm
400
What is the name of the point at which all phases can exist at the same time?
Triple Point
400
If 400 grams of Aluminum (Cp = .9 J/g°C) is warmed to 95°C and then added to 1,000 grams of 20°C water, what is the final temperature ?
25.95 degrees celsius
400
Solid A at 800 degrees C is immersed in liquid at B at 600 degrees C. How does heat energy change?
A releases heat, B absorbs heat
400
Find the number of moles of gas at 1.25 L, 250.0 K, and 1.06 atm
.0646mol
400
Convery 99.3 kPa to atmospheres
.98 atm
500
What is the name of the point where liquid can no longer exist?
The Critical Point
500
What is the final temperature of a metal if 2750 Joules are added to 150 grams of it at an initial temperature of 20°C ? It has a Cp of .4 J / g°C.
65.83 degrees celsius
500
24. Given the balanced equation representing a phase change: C6H4Cl1 + Energy --> C6H4Cl2
Is this an endothermic or exothermic reaction?
Endothermic because energy is being absorbed.
500
What is the pressure in atmospheres exerted by a 0.50 mol sample of nitrogen gas in a 10.0 L container at 298 K?
1.2atm
500
What pressure (in kPa) will be exerted by 0.450 mol of a gas at 25°C if it is contained in a 0.0650 L vessel