Name: ______________
Chemistry 112, Section B
Practice Hour Exam I
General Instructions: Read each question carefully and answer each question in the expected format., using proper English grammar.  Show your work on all calculation problems and include units where appropriate.
Answer Key
A. Definitions (2 points each)
1. Chemistry -
2.  ______  is an educated guess as to how or why something happens.
3. Accuracy -
4. _______  is the amount of matter in an object.
5. Element -
6. ______  is a uniform mixture of 2 or more compounds
7. Compound -
8. ______ is the mass of an object divided by its volume.
9. Precision -
10. ______ is a measure of a molecules kinetic energy.

B. Concepts
11. Complete the following table of measurements. (4 points)
                Measurement                SI unit, abbreviation
                 length                                   m
                 ______                              kg
                 _______                              g/cm3
                 temperature                      _________
                 volume                             _________

12. Complete the following table of prefixes. (7 points)
                Prefix                Abbreviation              Exponential factor
                 mega                        M                                  106
                 micro                     _____                              10-6
                 kilo                        _____                            _____
                 _____                   _____                             10-2
                 _____                      m                                 _____

13. How many significant figures are in the following measurements? (5 points)
                 2.70 g/cm3
                 113 K
                 0.0026 g
                 27,000 units
                 5.01 X 10-2 m

14. How many protons, neutrons and electrons does an atom of 40Ca have? (3 points)

15. Construct a table outlining the charge, mass and location of the subatomic particles. (6 points)

16. Write the electron configurations for the following elements. (6 points)
                 Ca
                 N
                 Ne

17. What are the major properties of the typical metals and nonmetals? (4 points)

18. Compute the mean density of the following unknown liquid. Express your answer in the correct number of significant figures. (5 points)
                               Volume, measured                 Mass, measured
    Trial 1                 9.81 mL                                  12.327 g
    Trial 2                 9.83 mL                                  12.179 g
    Trial 3                 9.92 mL                                  12.204 g

19. Give the name for each of the following elemental symbols. (4 points)
    Ne _______
    F    _______
    Ca _______
    S  ________

20. Describe the periodic trends for size and electronegativity. (4 points)

21. What oxidation state will the following atoms develop? (3 points)
                 F
                 Mg
                 S

22. Describe the difference between mass and weight. (4 points)

23. Give the symbol for each of the following elements. (5 points)
    potassium _______
    silicon _________
    actinium _________
    krypton ________
    boron ________

24. List the names of 4 groups of elements. (8 points)

25. How many periods exist in the modern periodic table of the elements? (1 point)

26. State the periodic law. (5 points)

27. How many valence electrons do the following elements have? (3 points)
                 Na
                 B
                 Ne

28. What is a valence electron anyway? (2 points)