Essay on Lab 2: Microscopy and the Metric System

2344 Words Apr 6th, 2013 10 Pages
Microscopy and the Metric System

Margaret E. Vorndam, M.S. Version 42-0090-00-01

Lab Report Assistant

This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.

Exercise 1: Measuring Length, Weight, Volume, and
Temperature

Try the following conversions for practice.

240,000 ng =0.24 mg =0.00024 g 50 cm
…show more content…
E. Outline the steps necessary to accurately weigh 3.5 g of starch. This depends on the scale used, but with the pen scale included in the labpaq, tare a bag or other container that can be used. Then add in the starch until the weight on the scale reads the weight of the container plus 3.5 g.

F. Outline the steps necessary to accurately pipet 5 mL of distilled water. Pour an aliquot of distilled water into a clean beaker. Put a little more than 5mL of distilled water in a beaker. Pipet 5mL from the beaker, and check to see if the bottom of the meniscus lines up with the 5mL line.

Exercise 2: Microscopy

The compound light microscope effectively magnifies in the range of 40x to 2000x. If an object under view is 10 nm in length without any magnification, what will be its viewing size at 40x? 400nm

at 2000x? 20 μm

What is the equivalent size at these magnifications, in inches? Show your calculations. 400nm*(1cm/10^7nm)*(1in/2.54cm)= 1.57*10^-5 in.
20μm*(1cm/10^4μm)*(1in/2.54cm)= 7.87*10^-4 in.

The scanning electron microscope (SEM) employs electron bombardment to image very small specimens. Electron microscopes are used to image specimens that range from 1 nm to 100 µm in size. What is the equivalent in inches? . Show your calculations. 1nm*(1cm/10^7nm)*(1in/2.54cm)= 3.94*10^-8 in.
100 μm*(1cm/10^4μm)*(1in/2.54cm)= 0.0039 in.

Procedure

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