Measuring and Introduction to Microscopy Lab by 1E6CH1

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									Name ____________________________________                 Period_______    Date__________

                  Measuring and Introduction to Microscopy Lab
Note: take all measurements in SI (metric) UNITS!!



Station #1 Electronic Scale (be sure to include units):
       a. Mass of the scissors = _______________________

       b. Mass of the penny= ______________________

       c. Using the “Common Metric Units” chart on your table, complete the following
       conversions:

           1.   5 m = _________ cm.
           2.   10 mm= _________ m.
           3.   452 cm = __________ mm.
           4.   37.6 km = ___________ m


Station #2 Triple Beam Balance (be sure to include units):
       a. Mass of the paperclip = _______________________
       b. Mass of the microscope slide = _________________



Station #3 Measurements of a block (be sure to include units):
       a. Mass of Block = ___________________________
       b. Length = ________________________
       c. Width = ______________________
       d. Height= ____________________
       e. Volume = _____________________
       f. *Density = ______________________
*Density = mass/volume



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Station #4 The Meniscus and the Graduated Cylinder (be sure to include units):
       a. The meniscus is defined as the curved surface of a liquid which is contained in a
          measuring device such as a graduated cylinder.
       b. Examine the diagram of the meniscus below. When measuring volumes of a liquid
          always measure to the bottom of the meniscus.




                                                                In the figure above,
                                                                     the correct
                                                                measurement is 73.0
                                                                         ml.

       c. Examine Graduated Cylinder A. Using proper technique, record the volume of water
          in the graduated cylinder to the nearest tenth of a milliliter (ml) (ex 8.4mL). Repeat
          for B.

          Volume of A = _____________________
          Volume of B = _____________________
Station #5 Temperature (be sure to include units):                         Be careful with the
       a. Temperature of the classroom= __________________                  thermometers!
       b. Temperature of liquid in beaker = _______________
       c. 20oC is about equal to _________ (in Fahrenheit)


Fahrenheit to Celsius:




Celsius to Fahrenheit:



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Station #6 Microscope Focusing Practice
       a. The microscope should be under low power (the shortest objective). Use the
          coarse adjustment (larger wheel) first to focus, then use the fine adjustment
          (smaller wheel) to refine the image. Draw what you see in the circle below.

Compound light microscopes have two lenses – one in the
eyepiece and another in the objective. To calculate the total
magnification of an image you must multiply the
magnification power of the eyepiece with the
magnification power of the objective. Your microscope’s
eyepiece lens has a power of 10x. What is the total
magnification of the image you drew to the
right?_________________________


       b. Now focus in on the sample using your medium power objective. Is the field
       of vision larger under low power or medium power? In other words, are you
       seeing more or less of the entire sample?

               1. I am seeing more less (circle one) of the entire sample under medium
                   power.
               2. Therefore, my field of vision increased decreased (circle one) when
                   I switched to medium power.
       c. Now focus in on the sample under high power. Draw what you see below.



                                                                The total magnification of this image
                                                                is _________________.




Station #7 Graduated Cylinder Practice (Worksheet)
Use the worksheet. Measure the volume, estimating the last digit.




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Station #8: Short Answer

1. The SI system of measurement is a revised version of the original metric system. What
does the abbreviation SI stand for?

____________________________________________________________

2. List the seven SI base units.

        1. ______________________                    5. _______________________
        2. ______________________                    6. _______________________
        3. _______________________                   7. _______________________
        4. _______________________

3. If SI measurement is no more accurate than the English system, why do scientists
throughout the world use it?
______________________________________________________________________
______________________________________________________________________
______________________________________________________________________
4. Why is it useful that all scientists use a common system of measurement?
______________________________________________________________________
______________________________________________________________________


Metric Practice
Circle the greatest metric measurement in each series.


   1.   500cm,         5000mm,       4m


   2.   0.2L           240mL         50cL


   3.   3000mg,        250cg,        3kg




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