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# Size of things Essay

Chemistry – Unit 1 – Worksheet 5
Size of Things
For this worksheet, you will need to go to the site – http://www.vendian.org/howbig/ to answer the following questions. Part 1 – Real World
Click on the link to Real World; make sure that you are looking at the sheet of graph paper. Each of the tiny squares on the paper is 1 mm (10-3 m) on a side. Examine the objects whose approximate size is given (~ 100 mm means the object is approximately 100 millimeters wide).

1.Using the graph paper as a measuring tool, estimate the diameter of the following in mm: quarter golf ball ping pong ball

2.Use the ruler below the objects to estimate the diameter of each in inches. quarter golf ball ping pong ball

3.How long is the 5 Euro bill in mm in cm in inches ?

Part 2 – Micro World
Go to the top of the page and click on the micro link. Each of the tiny squares on the graph paper is 1 m (10-6 m) on a side. Examine the objects whose approximate size is given (~ 10m means the object is approximately 10 micrometers wide).

1.Estimate the length of the paramecium in m. You might have to use the Pythagorean Theorem to find this. Use the conversion factor 1m = 106m to change this length to m.

Why is it more convenient to express this value in m?

2. Lower on the page are some drops from an inkjet printer with a resolution
of 1200 dpi. Estimate the diameter (in m) of such a drop

3. Estimate the length of the left-most human chromosome.

4.The author shows the thickness of a sheet of aluminum foil. What is this in m? Use the conversion factor 1m = 106m to change this thickness to m
Now, convert this thickness to cm. (1m = 100 cm) How does this compare to the value you obtained? Part 3 – Nano World
Go back to the top of the page and click on the nano link. Each of the tiny squares on the graph paper is 1 nm (10-9 m) on a side. Examine the objects whose approximate size is given (~ 10nm means the object is approximately 10 nanometers wide).

1.Scroll down to find the circle that approximates a globular protein. Estimate the size of a globular protein in nm. Use the conversion factor 1m = 109nm to convert this value to meters. It would be more convenient to express this value in scientific notation. Do so. .

2.Estimate the length (in nm) of a single wall nanotube, an engineered molecule containing carbon atoms

3.Roughly how many times larger is the smallest virus than a buckyball?

Part 4 – Kilo World
Go back to the top of the page and click on the kilo link. Each of the tiny squares on the graph paper is 1 kilometer (103 m) on a side. Examine the map of a portion of Massachusetts.

1.Estimate the distance (in km) between Boston and Cambridge.

2.Scroll down to find the ruler. Use the ruler on the sheet to determine a conversion factor between miles and kilometers.
km = miles

3.Scroll down to the next map. Estimate the length (in km) of Nantucket Is. . Use the conversion factor from above to change this length to miles

If you could walk a mile in 30 minutes, how long would it take you to walk the length of this island? Show work.

4.Lower on the page is a satellite photo of a portion of the Rodeo-Chediski fire, the second worst forest fire in Arizona history (2002). Over 460,000 acres of forest burned. The green square next to the image of the fire shows 1 million, or 106 acres. Convert this area to km2, then determine the area scorched by the fire in km2. Show your work.

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