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Note: Different colored exams will have the me questions in different order sa
Solid Investigation Question: What is the identity of an unknown solid piece of metal?
Specific questions:
1. What are the observable physical properties of your sample?
2. If provided with a table of densities of metals, how might you use this information to identify your piece of metal?
a. Given that calculating a physical constant is more reliable using a graph with multiple measurements
from multiple samples than using measurements from a single sample, how could you use a graph to
determine density if you are provided metal pieces of various lengths. Please note that you are required to
submit a graph for your micro-project. Your graph will need to have a title, axes labels and a trend-line as
well as trend-line equation.
i. How would you determine volume?
ii. What would you plot in order to get a slope that gives you density?
iii. What is the density of your sample?
Solution Investigation Question What are some of the key characteristics of unknown :
sample of an aqueous solution containing an ionic compound?
Specific questions:
1. Given that the cation is from Group 1A, what is the identity of the group 1A metal ion in your solution?
2. Given that the ionic compound contains either chloride or hydroxide, how can you determine which? (Two pieces
of evidence are required and one must be related to solubility rules)
3. What is the concentration of your solution? (Your unknown sample is known to be about 1 M, but you need to
determine the concentration to 3 significant figures using titration. You should plan ahead so that you know
approximately what volume of your sample you will need in order to use approximately 25 mL of 0.100 M
sulfuric acid for the titration).
