Arkansas State University Department of Chemistry and Physics

CHEM1003                                                                        Name______________________
Exam 1                                                                                Spring 1996

1. Label each of the following as either a physical (P) or chemical (C) change.      (10 points)

 Salt dissolving in water   _____

 Wood burning                  _____

 Glass breaking                _____

 Ice melting                       _____

 Silver tarnishing              _____

2. Fill in the blank.    (2 points each)

 Capability to do work   __________________

 How close a value is to the true or accepted value describes   __did not cover this semester___________

 Measure of heat intensity   __did not cover this semester___________

 The force with which objects are attracted by gravity__________________

 Reproducibility of a measurement __did not cover this semester___________

 Mass/volume defines  __________________________

 Occupies space and has mass ____________________

 Energy can be classified as two types _________________
           _________________

 Combination of two or more base units __did not cover this semester___________

3. Label each of the following as either extensive (E) or  intensive (I).    (10 points)

 a)  the boiling point of water    ______

 b)  the mass of gravel      ______

 c)  the amount of heat needed to melt ice  ______

 d)  the density of a lead rod     ______

 e)  the hardness of diamond     ______

4. Using SI units, give the unit of measurement for each of the  following.    (10 points)

 mass -                                                               time -

 temperature -                                                   length -

 luminous intensity -
 

5. Give the number of significant figures in each of the  following.    (10 points)

 a)  0.0005 g   ______

 b)  0.340 mm   ______

 c)  29000 + 100 ft  ______

 d)  8.09 x 10⁵ L  ______

 e)  the number of cans in a six pack of your favorite beverage   ______

6. Determine the answer for each of the following.  Be sure to  use the correct number of significant figures and circle the  correct answer.  (10 points)
 

a)     17.34                         b)    12.4023
          6.9                                 -  1.62
  +      3.152
 
 
 
 

c)  0.32 x 14.5 x 1.20 =                                   d)  0.250 / 0.050  =
 
 
 

e)  Number of feet in 1.24 yd.  3 ft = 1 yd
 
 
 
 
 
 
 

7. Convert each of the following into correct scientific notation with 3 significant figures in your answer.  (10 points)

 17472    _________________________________
 

 0.00000984     _________________________________
 

 3200.0 x 10²  _________________________________
 

 0.02014 x 10^-3  _________________________________
 

 25000000000000000000  __________________________

8. Calculate the following.  Circle the correct answer.  Use correct significant figures.   (4 points)
 

 a)  2.34 x 10⁴⁷                       b)  9132.0
   + 9.2 x 10⁴⁶                               -    1.6 x 10³
 
 
 
 
 
 

9. Calculate the following.  Circle the correct answer.  Use correct significant figures.   (4 points)
 

 a)  (1.54 x 10⁵⁸)(3.5 x 10⁶⁰)
 
 
 

 b)    7.9 x 10³⁴
       8.32 x 10²³
 

10. Convert 17.4 cm to in.  (2 points)  Show work.                     1 in = 2.54 cm
 
 
 
 
 
 
 
 

11. Convert 2.78 x 10⁴ cm to km.  (3 points)  Show work.
 
 
 
 
 
 
 

12. The density of iron is 7.86 g/cm³.  What is the volume of 55.0  g of iron?  (3 points)  Show work.
 
 
 
 
 
 
 

14. Convert 37.5 mm³ to mL.   (4 points)  Show work.