1. How many molecules are in 78.9g of tungsten IV sulfite?

 

  1. How many grams of oxalic acid are in 492.3 mL of a 2.88 M solution?

 

  1. How many moles of oxygen will fit in a 87.04 L container at 34.8oC and 865 Torr?

 

  1. If a container holds 3.99 moles of chlorine gas at 70.42oC and 2.97 atm, what will the new pressure be if the temperature goes up to 407.7oC and 2.05 moles of the gas leak out of the container?

 

 

  1. If the valve in the picture below is opened, what will the final pressure be in the container?

 

 

 

 

 

 

 

 

 

 

  1. Chlorine and oxygen run a 2 mile race. If the oxygen takes 4 hours and 18 minutes, how long does the chlorine take and who wins the race?

 

  1. A student does the hydrate lab and obtains the data below. Determine the empirical formula of the hydrated salt.

Mass of empty crucible

14.321 g

Mass of crucible with hydrated cobaltous chloride

15.648 g

Mass after heating

15.046 g

 

 

 

 

 

  1. Why does the pressure of a gas go up when the temperature is increased?

 

  1. One of the teachers at LM is under tremendous stress and begins to suck his thumb. The more stressed he gets, the harder he sucks on his thumb. After several days of this he notices that his thumb is bruised. How did that happen? (I want to know how he created “suction” and why that resulted in a bruise.)

 

  1. Fluorine has the highest electronegativity of any element on the periodic table. Why does it have a higher electronegativity than chlorine? Why is it higher than oxygen? Why is it higher than Neon?

 

  1. Give the electron configurations for the following ions. Circle any configurations that are stable and tell me why they are stable.

Cl+5

Fe+2

Pb+2

Pb+4

 

  1. How did Schrodinger solve the quantum leaping problem (electrons going from place to place without being in between)? Be sure to explain his answer, not just label the answer.

 

  1. Neils Bohr declared that the energy of electrons is quantized, and used that idea to explain how light is produced in a gas filled tube. What was his explanation? What part (or parts) of his explanation do we still believe?

 

  1. Draw the Lewis Dot Structures for the following molecules and ions. For each central atom, tell me the structure and shape. Label the polarity on the bonds and circle any polar molecules.

C2H6

IF3

nitrite

 

  1. What part, if any, of the work of each of the following scientists do we still believe?

Thomson, Rutherford, Dalton, Millikan

 

  1. Fill out the following tables

 

Name

Formula

Oxalic acid

 

 

Gold III bichromate

 

 

Tetrarsenic decoxide

 

 

 

Formula

Name

I2F7

 

 

Fe(HSO4)2

 

 

H3P

 

 
  1. Fill out the following table.

 

Symbol

Atomic number

Mass number

charge

# of protons

# of electrons

# of neutrons

O

 

18

-2

 

 

 

 

 

 

72

 

 

 

68

106

 

 

 

 

 

38

36

50