REVIEW QUESTIONS

Test 2

  1. A cylinder with a moving piston expands from an initial volume of 0.250 L against an external pressure of 2.00 atm . The expansion does 288 J of work on the surroundings. What is the final volume of the cylinder?
  2. Manganese reacts with hydrochloric acid to produce manganese (II) chloride and hydrogen gas.
When 0.625 g of Mn is combined with enough HCl to make 100.0 mL of solution in a coffee-cup calorimeter, all of the Mn reacts, raising the temperature of the solution from to . Find for the reaction as written. (Assume specific heat and density of solution are the same as that of water).
3. The standard heat of reaction ( ) for the reaction shown below is -1985 kJ . Based on the given for each substance, determine the for .
  1. Find (in kJ ) for the reaction shown below:
from the following given reactions:
  1. Given the heat of reaction ( ) for the reaction shown below, what is for this reaction?
  1. Molybdenum metal has a threshold frequency of before it can emit an electron from its surface by photoelectric effect. If Mo is radiated by a light with a wavelength of , would it emit an electron? If so, what would be the maximum velocity of the electron emitted?
  2. Calculate the wavelength of golf ball travelling at . (Calculate answer to 2 significant figures)
  3. Neutron diffraction is an important technique for determining the structures of molecules. Calculate the velocity of a neutron with a wavelength of 0.088 nm . (mass of neutron )
  4. The heat of combustion of glucose is . A sample of glucose is burned in a bomb calorimeter containing 2.700 kg of water. The temperature of the calorimeter and the water increased from to . What is the heat capacity of the dry calorimeter?
  5. When 2.00 g of HF gas is bubbled through of water at , all the gas dissolves and the temperature of the solution rises to . What is the enthalpy change of solution ( ) for HF? (Assume density and specific heat of solution to be the same as pure water)
  6. The electron affinities (EA) for the elements from Al to in are :
    Al (-44)
    Si (-120)
    P (-74)
    S (-200.4)
    Cl (-348.7)
    a) What is the general trend of EA among these atoms? Explain the reason for this trend.
    b) Explain why phosphorous has a lower EA than Si .
  7. Using data from your textbook, calculate the change in energy expected for each of the following processes:
    a)
    b)
    c)

Answers:

  1. 1.67 L
  2. -195 kJ
  5. -352.5 kJ
  11. No answers provided
  12. a) 147 kJ
    b) 410 kJ
    c) 1122 kJ