Chemcom Unit 1 Exam . . . An Introduction

Multiple Choice (Choose the best answer.)

  1. One of the safety rules is,"Never enter the chemical storage areas."


  2. One of the safety rules is, "Always be serious, responsible, and alert."


  3. Several statements are listed below. Which is/are qualitative?

    I. The candle is 3.0 inches tall.
    II.. The melted wax puddles at the base of the candle wick.
    III.. The candle has been used before.
    IV. The candle flame is yellow and blue.
    V. The candle makes no sound.

    I only

    II only

    III only

    I and V only

    II and IV only

  4. Of the statements listed in question 3, which is/are quantitative?

    I only

    II only

    III only

    I and V only

    II and IV only

  5. Of the statements listed in question 3, which is/are inferences?

    I only

    II only

    III only

    I and V only

    II and IV only

  6. Which of the numbers below is correctly expresses 0.0004050 in scientific notation?

    0.4050 x 10 -3

    4.050 x 10 -3

    4.050 x 10 -4

    4.050 x 10 3

    4.050 x 10 4

  7. Which of the numbers below correctly expresses 2.30 x 103 in regular notation?

    2300

    230

    0.00230

    23

    0.000230

  8. Read the following length measurement to the correct number of significant digits:

    12 cm

    12.3 cm

    12.4 cm

    12.33 cm

    12.03 cm

  9. How many significant figures are in the following numbers?
     I.  0.0240 g
    II.   100.5 oC
    III.  1300 s 

    I (2 Sig. Figs.), II (2 Sig. Figs.) III (3 Sig Figs.)

    I (2 Sig. Figs.), II (2 Sig. Figs.) III (2 Sig Figs.)

    I (3 Sig. Figs.), II (4 Sig. Figs.) III (4 Sig Figs.)

    I (5 Sig. Figs.), II (4 Sig. Figs.) III (4 Sig Figs.)

    I (3 Sig. Figss.), II (4 Sig. Figs.) III (2 Sig Figs.)

  10. Round the 120.450 mL to 3 significant digits.

    100 mL

    120 mL

    120. mL

    121 mL

    120.5 mL

  11. Add the following numbers using significant digits: 25.01 cm + 5.056 cm =

    30. cm

    30.1 cm

    30.06 cm

    30.07 cm

    30.066 cm

  12. Subtract the following numbers using significant digits: 300 g - 11 g =

    300 g

    280 g

    290 g

    289 g

    289.0 g

  13. Multiply the following numbers using significant digits: 20.2 m x 0.50 m =

    10 m 2

    10. m 2

    10.0 m 2

    10.1 m 2

    10.10 m 2

  14. Divide the following numbers using significant digits: 2.00 g / 5 mL

    0 g / mL

    0.0 g / mL

    0.4 g / mL

    0.40 g / mL

    0.400 g / mL

    Use the graph below to answer questions 15 - 20:

  15. What is incorrect about the graph above?

    The units for distance are incorrect.

    The units for time are incorrect.

    The X axis is scaled incorrectly.

    The title is incorrect.

    Everything about the graph is OK.

  16. How far would the marble roll in 4 seconds?

    3.2 cm

    2.6 cm

    5.0 cm

    3.6 cm

  17. How much time would it take for the marble to roll 7 meters?

    8.8 sec

    5.6 sec

    4.8 sec

    8.0 sec

  18. What is the best value for the slope of the graph?

    1.2 m/s

    0.83 m/s

    1.0 m/s

    12 m/s

  19. How long would it take the marble to roll 25 m?

    25 s

    21 s

    30 s

    It is impossible to tell.

  20. How many meters could the marble roll in 50 seconds?

    0.02 m

    42 m

    60 m

    It is impossible to tell.

  21. The piece of metal has a mass of 4.0 g and a mass of 3.5 m. What is the density of the metal?

    7.5 g / mL

    1.1 g / mL

    0.88 g / mL

    0.5 g / mL

  22. After sprouting, a plant grows 2.2 cm per day. How long would it take to reach a height of 10. cm?

    220 days

    22 days

    4.5 days

    0.22 days

  23. Which correctly lists the parts of a lab report in order?

    Purpose, Data, Procedure, Data Analysis, Conclusion

    Data, Purpose, Procedure, Data Analysis, Conclusion

    Purpose, Procedure, Data, Data Analysis, Conclusion

    Purpose, Procedure, Conclusion, Data, Data Analysis

  24. What section of a lab report summarizes the actions you are performing in the lab?

    Purpose

    Procedure

    Data Analysis

    Conclusion

  25. A conclusion in a lab report should do the following:

    Restate the purpose.

    Summarize the results.

    List experimental errors.

    All of the above.

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