Level 100 Level 102
Level 101

Colligative Properties & Energy


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How many moles of ions are produced by the dissociation of NH4Br?
2 K+ + S-2
What is the equation for dissolving K2S?
What is dissociation?
When ions are formed from solute molecules by the action of the solvent
What happens when a molecular substance ionizes in water?
Charged particles are formed and the more electronegative atom becomes a negative ion
C6H6
HCl
H3O+
Cis or Trans Addition, Markovnikov (OH, H) added
Why is boiling point elevation and freezing point depression colligative properties
They both are directly proportional to the molal concentration of a solution
4.3 m
The freezing point of an aqueous solution that contains a nonelectrolyte is -8.0 C. What is the molal concentration of the solution?
0.34 C
What is the boiling-point elevation of a solution made from 10.0 g of a nonelectrolyte solute and 300.0 g of water? The molar mass of the solute is 50.0 g and the molal boiling-point cons…
-0.056 C
What is the approximate freezing-point depression of a 0.010 m aqueous CaCl2 solution?
-0.37 C
What is the approximate freezing-point depression of a 0.05 m aqueous FeCl3 solution?
ion attraction
Actual freezing-point depressions of electrolyte solutions are slightly lower than the calculated values because of...
three times as much because MgCl2 breaks apart into 3 ions
What is the freezing point depression of a 0.01 m sugar solution compared to a 0.01 m MgCl2 solution?
Why do electrolytes affect colligative properties differently than do nonelectrolytes?
electrolytes produce more moles of solute particles per mole of solute
What is temperature?
Measure of the average kinetic energy of the particles in a sample of matter
Kelvin and degree C
What units are used to measure temperature?
What is heat?
The energy transferred between samples of matter because of a difference in their temperatures
What units are used to measure heat?
kJ or J are the most common. Calories can be used as well
What is specific heat?
The heat required to raise the temperature of 1 g of a substance by 1 degree C or 1 K
J/g C
What units are used to measure specific heat?
heat/(mass * temperature change)
What is the formula for specific heat?
heat
a flow of energy due to a temperature difference
What is the delta mean in the specific heat formula?
change in something. In this formula, it means change in temperature
How is delta T calculated?
Final temperature - Initial temperature
0.4 J/g C
Find the specific heat of a material if a 6 g sample absorbs 50 J when it is heated from 30 degrees to 50 degrees Celcius?
26 J
How much energy is absorbed as heat by 20. g of gold when it is heated from 25 degrees to 35 degrees C? The specific heat of gold is 0.13 J/g C.
0.24 J/G C
A 5.0 g sample of silver is heated from 0 degrees to 35 degrees C and absorbs 42 J of energy as heat. What is the specific heat of silver?
What is the enthalpy change?
temperature change of a system at constant pressure
What is the heat of reaction?
The quantity of energy released or absorbed as heat during a chemical reaction
24.56 degree C
What is the final temperature of water when 53 grams of water at 15.0 degree C gains 2121 J of heat?
What is an endothermic reaction?
A reaction where energy is absorbed. It feels cold to the touch.
What is an exothermic reaction?
A reaction where energy is released. It feels hot to the touch.