Essay on Chm 130 Lab 7

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Lab 7

Determining the Formula of a Compound

A. Data Table (show completed data table here) (12 points)

|Measurements |Mass (in grams) |
|Mass of empty 100 mL beaker |55.45 g |
|Mass of zinc metal |1.80 g |
|Mass of beaker containing zinc chloride |58.16 g |

B. Follow-Up Questions
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Not only would spattering have been dangerous, it would have reduced the amount of the mixture left in the beaker for measuring. Another possible source for error is when heating in the final stages if all the liquid did not evaporate that would cause the reading on the scale to be too high, thus throwing off the data.

8. Is zinc chloride an ionic compound or a molecular compound? Explain. (8 points)

Zinc chloride is an ionic compound. An ionic compound is made up of two elements, a metal and non-metal. They also consist of positive and negative ions. When an ionic compound is formed the ions bond to make a zero charge. The second element (the non-metal) is named by adding –ide to the end of it, providing it is a monatomic ion. The mixture of zinc chloride contains a metal (zinc) and a non-metal (chloride). Zinc has a charge of +2 and Chlorine has a charge of -1, so it consists of a positive and negative ion. Thus when zinc and chlorine combine, it actually takes 2 chlorine ions to bond with 1 zinc ion. This would give the formula a zero charge, and also make it an ionic compound. Finally, the name of the non-metal ion is chlorine, in this experiment it becomes chloride, adding –ide to the end also is proof it is an ionic compound since this is a bond between a metal and non-metal, and since there is no prefix in the name.

9. List at

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