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Grossmont College Name _____________________________
Spring 2011 Lab Day___________ Date ____________
Part I: Multiple Choice (2 points each)
Directions: Please circle the best answer for each of the following questions.
Question 1. An element that has four valence
electrons could form
Question 2. Eighteen valence electrons are present in the Lewis structure of
Question 3. Which ion pairing is the chemical formula given not consistent with the ionic charges?
Question 4. Which of the following sets of information about a sample of a compound is sufficient to calculate the compound’s molar mass?
Question 5. What is the empirical formula for a compound whose molecular formula is C2H2O4?
Question 6. Which of the following concept pairings relating to element classifications in incorrect?
Question 7. Which of the following is true about x?
Question 8. One mole of dichlorine monoxide contains
Question 9. Which of the following are incorrectly written electron configurations?
Question 10. Which parts of the body are at-risk for exposure to chemicals?
Part II: Short Answer
Directions: Answer each of the following questions. Be sure to use complete sentences where appropriate. For full credit be sure to show all of your work.
Question 1. Technetium forms three monoatomic ions, Tc4+, Tc6+, Tc7+. From this sublevel do you expect electrons are lost in forming these ions? (Hint: It is possible for electrons other than those in the s and p sublevels to be involved in forming ions.) (7 points)
Question 2. If a 1.00 g sample of a carbon-containing compound is burned in air, 0.75 g of carbon dioxide (the only carbon-containing product) is produced. What is the mass percent carbon in the compound (6 points)?
Question 3. Draw electron orbital diagrams to show the distribution of electrons among orbitals in each of the following electron subshells (4 points):
Question 4. Identify the bond of greatest polarity in each of the following set of bonds (4 points):
Question 5. Based on periodic trends, indicate which member of each pair of elements is (5 points):
Question 6. Given the correct IUPAC name for the following compounds (10 points):
Question 7. Write the correct formula for the following compounds (10 points):
Question 8. For each molecule: a) draw the Lewis structure; b) give the electron pair geometry; c) give the molecular shape; d) give the bond angle; e) identify the molecule as polar or nonpolar (14 points).
a. dichloromethane, CH2Cl2 b. carbon disulfide, CS2 c. nitryl chloride, ClNO2
Question 9. If 1.550 g of mercury oxide decomposes to give 1.435 g of liquid mercury and oxygen gas (12 points).
Question 10. Specify the reason each of the following electron dot structures is incorrect. Draw correct structures (8 points).
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