Some Practice for Exam 2 CHEM 2090.  Note the actual exam will not have this many multiple choice questions. It may have no multiple choice questions.   Be prepared to explain concepts in detail.
  1. What is the formula mass of CaSO4?
  2. What is Avogadro's number?
  3. Baking soda is sodium hydrogen carbonate. What is the formula for baking soda?
  4. Balance the equation for the combustion of octane (C8H18 ). C8H18 + O2 ---------------> CO2 + H2O
  5. Aspirin has a formula C9H8O4. What is the molar mass of aspirin?
  6. If 7.0 grams of propane (C3H8)are burned, how many grams of water are produced? Use the balanced equation shown below.
    7. C3H8 + 5 O2 ----------> 3 CO2 + 4 H2O,
  7. In the following reaction, what is the oxidizing agent? Fe2O3 + 3CO -------------> 2 Fe + 3 CO2
  8. Glucose is combusted in the presence of oxygen. Which of the following statements is correct? C6H12O6 + 6 O2 --------> 6CO2 + 6 H a.  Glucose is oxidized and oxygen is the reducing agent
    b.  Oxygen is reduced and glucose is the oxidizing agent 
    c.  Glucose is oxidized and oxygen is the oxidizing agent 
    d.  Carbon dioxide is oxidized and oxygen is the oxidizing agent 
    e.  None of these
  9. Fermentation of fructose (C6H12O6) produces ethanol (C2H5OH) according to the following balanced equation:
    C6H12O6 ------>2 C2H5OH + 2 CO2.   What mass of fructose is needed to produce 1.5 g of ethanol?
  10.  How many moles of water are in a drop of water that weighs 5.0 mg? 
  11. How many molecules of ethanol are in a 46 gram sample of ethanol (C2H5OH)? 
  12. What are the products when hexanol, C6H13OH, burns in oxygen?
  13.  How much oxygen gas is produced if 10.0 g of potassium chlorate (KClO3) decomposes? 
  14. The following reaction is balanced: 2KClO3 ----> 2KCl + 3O2
  15. Balance the following chemical equation: HBr + NaOH ------> NaBr + H2O
  16. How many grams of product can be made from 5.0 grams of butene (C4H8) in the following balanced reaction:
    C4H8 + Br2 --------> C4H8Br2  
  17. If a balloon is filled with 4.0 L of helium at 25C and the balloon is heated to 37C, what is the new volume? 
  18. Breathing illustrates which of the following laws?
    a. Volume and pressure are directly proportional.
    b.  Volume and temperature are indirectly proportional.
    c.  Pressure and volume are indirectly proportional.
    d.  Pressure and temperature are directly proportional.
    e.  None of these
  19. Autoclave sterilization illustrates which of the following laws?
    a.  Pressure is directly proportional to temperature.
    b.  Pressure is indirectly proportional to temperature.
    c.  Volume and pressure are indirectly proportional.
    d.  Temperature and volume are indirectly proportional.
    e.  None of these
  20. Which of the following gases are very soluble in water?
    I. Oxygen, O2 II. Nitrogen, N2 III. Carbon dioxide, CO2 IV. Ammonia, NH3
    a. I and III b. II and IV c. I, II and III d. IV only e. none of these
  21. If the partial pressure of a gas increases, what will happen to the gas that is dissolved in water?
    a.  The pressure of the water will increase.
    b.  The volume of water will decrease.
    c.  The amount of gas that is dissolved in water will increase.
    d.  The amount of gas that is dissolved in water will decrease.
    e.  None of these is correct.
  22. Caisson's disease occurs when a person abruptly leaves a high pressure environment. Explain why the ill effects of this disease occur.
  23. Which of the following molecules are polar?

    I. H2O          II. CF4            III. CH3OH                IV. CH4

    a. I and III b. II and IV c. I, II and III d. IV only e. none of these
  24. Which of the following pure substances can have hydrogen bonds?

    I. H2O                  II. CF4               III. CH3OH                 IV. CH4

    a. I and III b. II and IV c. I, II and III d. IV only e. none of these
  25. Put the following compounds in order of decreasing intermolecular forces:
    H2O > CF4 > CH3OH >CH4
    H2O >CH3OH > CF4 > CH4
    CH4> CF4 > CH3OH > H2O
    H2O > CH3OH > CH4 > CF4
    None of these
  26. Which of the following statements is correct:
    I. Liquids have no intermolecular forces
    II. Solids have the maximum number of intermolecular forces
    III. Solids and Liquids have the same number of intermolecular forces
    IV. Gases have no intermolecular forces

    a. I and III b. II and IV c. I, II and III d. IV only e. none of these
  27. In which of the following states of matter are molecules extremely far apart and disordered? 
  28. What is the name of the transformation directly from solid to gas?
  29. The melting point of a substance is also called_________________.
  30. Which attraction between molecules is the strongest?
  31.  Which of the following compounds has the highest boiling point?
    C8H17OH           C5H11OH                    C4H9OH                 C2H5OH                   None of these