Test #5 Example

Directions:  Use Scantron 882-E only.  Mark all answers using a #2 pencil and erase all errors completely.  LUCK!!!

1.        Calculate the number of joules of heat needed to increase the temperature of a 25.0 g piece of aluminum metal from 35.0^oC to 57.0^oC.  The specific heat of aluminum is 0.908 J/g^oC.

a.       500 J

b.       499 J

c.       250 J

d.       5.0 x 10² J

e.       None of the above

2.       Solutions of sodium hypochlorite are sold as laundry bleach.  This bleaching agent can be produced by the reaction:  sodium hydroxide and chlorine gas forms sodium chloride + sodium hypochlorite and water.  If 75.0 g of sodium hydroxide and 50.0 g of chlorine gas are reacted, what is the percent yield of sodium hypochlorite if the actual yield is 43.2 g?

a.       78.0 %

b.       52.9 %

c.       82.3 %

d.       95.6 %

e.       None of the above

3.       Iodine occurs naturally in seawater and seaweed, from which it can be commercially extracted.  The chemical equation for the reaction of with hydrogen sulfide gas is:  iodine reacts with hydrogen sulfide gas to form sulfur (S) and solid hydrogen iodide.  For this reaction, how many grams of iodine are needed to produce 25.00 g of sulfur (S)?

a.       98.95 g

b.       131.9 g

c.       395.8 g

d.       197.9 g

e.       None of the above

4.       Which of the following molecules exhibit molecular polarity?

a.       Methane

b.       Nitrogen

c.       Phosphorus trichloride

d.       Carbon dioxide

e.       All exhibit molecular polarity

5.       Consider the following set of elements:  calcium, bromine, germanium, potassium, gallium.  Which element from this list has the lowest electronegativity?

a.       Calcium

b.       Bromine

c.       Germanium

d.       Potassium

e.       Gallium

6.      An atom with an electron configuration of 1s² 2s² 2p³ has how many valence electrons?

a.       2

b.      3

c.       4

d.      5

e.       7

7.      Which one of the following is NOT an assumption of the kinetic-molecular theory?

a.       Gas particles move in random, straight-line paths.

b.      Most of a gas sample is empty space.

c.       Gas particles have strong intermolecular attractive forces.

d.      Gas particles undergo elastic collisions.

e.       Gases at the same T and P have the same average kinetic energies.

8.      A pressure of 0.896 atm is equal to

a.       681 torr

b.      848 torr

c.       245 torr

d.      305 torr

e.       896 torr

9.      The _________  sublevel of an atom has a total of five orbitals.

a.       s

b.      p

c.       d

d.      f

e.       g

10.  Under what conditions would a sample of gas be said to be STP?

a.       P = 740 torr, T = 273 K

b.      P = 760 torr, T = 0^oF

c.       P = 1 atm, T = 0^oC

d.      P = 750 torr, T = 0^oC

e.       P = 1.00 atm, T = -273 K

11.  You give a child a balloon, and he goes outside with it to play in the snow.  Soon, he returns crying.  What happened?

a.       The balloon expanded and burst.

b.      The balloon froze solid.

c.       The balloon shrank.

d.      The balloon dissolved.

e.       The child forgot Charles’ Law.