Solid Investigation Question: What is the identity of an unknown solid piece of

Question

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? (you are provided metal pieces of various lengths).

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?

Explanation / Answer

1) mass, volume, temperature

2) By comparison between the value obtained for the density of the problem sample and the reported value in tables. Each metal has an specific value of density.

i) Using a graduated cylinder. Put water in it, see the mark, put the metal piece and measure the new volume, then substract the Final Volume - initial volume.

ii) mass of sample (Y axis) vs volume of sample. (x axis)

iii) the slope of the curve is the density.

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