Atomic Coatings - The Size Of An Atom Lab (Page 2 of 2) in pdf

9. If time permits, repeat steps 1-8 with a second piece of galvanized iron.

10. Return the used metal pieces to the instructor for disposal.

Data and Calculations:

Data and Results Table

Trial 1

Trial 2

Mass of galvanized iron, initial

Length of galvanized iron

Width of galvanized iron

Mass of galvanized iron, final

Temperature change of solution during the

reaction (temp ↑, ↓ or no apparent change)

Refer to Conclusion Questions to complete

Trial 1

Trial 2

the following:

1. Mass of zinc coating

2. Moles of zinc coating

3. Atoms of zinc coating

4. Volume of zinc coating

5. Volume of zinc coating per side

6. Thickness of zinc coating per side

7. Number of layers of zinc atoms per side

Conclusion Questions: Show all work. Enter the results of the calculations in the Data and Results Table.

1. Calculate the mass of zinc coating on the metal.

2. Convert the mass of zinc (determined in question 1) to moles of zinc using the molar mass of zinc.

3. Convert moles of zinc (determined in question 2) to atoms of zinc using Avogadro’s number.

4. To determine the volume of the zinc coating on the galvanized iron use the density of zinc (7.13 g/cm

) and the mass of zinc

from question 1.

5. The zinc coating was present on both sides of the piece of galvanized iron. Divide the total volume of zinc coating,

determined in question 4, by two to determine the volume of the zinc coating per side of the galvanized iron.

6. The formula for the volume of a rectangular solid is V=lwh. Rearrange this formula to solve for the unknown height

(thickness) and substitute in the known volume per side (determined in question 5) and the length and width of the galvanized

iron.

-8

2.66x10

7. The diameter of a single zinc atom is

. Divide the thickness of the zinc coating per side (determined in question

6) of the galvanized iron by the diameter of a singe zinc atom to calculate the number of layers of atoms in the zinc coating.

Number of layers of zinc atoms = Thickness of zinc coating per side (cm)

Diameter of zinc atom (cm)

8. Determine the mass of hydrogen gas generated in trial #1.

9. Was this reaction endothermic or exothermic? What indicates this result and how would you change the experiment to be able

to get a significant temperature change (one great enough to register on a thermometer)?

9. Detail two errors which may have occurred in your lab and clearly explain the effects of these errors on the number of zinc

atoms. [SEE BELOW]



CLAIM

EVIDENCE

REASONING

You will state a claim (detail a potential error committed in the lab procedure), then you will provide evidence for the claim

(involving a change in the data from where it should have been to what it was recorded as), and finally you will reason out the

effect the error had on the outcome of the lab (use the reasoning that links the evidence to the claim)!

Atomic Coatings - The Size Of An Atom Lab Page 2

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