# Density of solids and liquids

Please show all work.

1-When calculating the density of your regularly shaped object, which measurement will limit your final result?

2-If when calculating the density of an object using Archimedes' Principle, you splash a few milliliters of water out of the graduated cylinder upon putting the object in the cylinder, how would that affect your density calculation (be specific)?

3-Explain why an object whose density you are trying to measure using Archimedes' Principle must have a density greater than 1 g/mL.

4-What is the density of an object that displaces 38.6 mL of water and has a mass of 55.362 g?

5-If an object made from the same material as that in question 5) were to have a mass of 100 g, how much volume (mL) would that object occupy? Use dimensional analysis and show your work!

6-Write the name and molecular formula of the organic compound you will use during this lab experiment.

(1) Write the chemical formula for sodium chloride.

(1) Write the chemical formula for magnesium chloride.

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#### Solution Preview

When calculating the density of a regularly shaped object, we need two measurements. Density is mass divided by volume, and the latter can be calculated by multiplying the length, width and height of the object. Of the two (mass and volume), the volume can be difficult to calculate accurately. Consider measuring the length, width and height of a cube of wood. It's very likely that each of those three measurements will be off by a little bit due to human error (e.g. the ruler wasn't held straight for the measurement), and the problem is tripled across all three measurements. Contrast this to the mass, which is ...

#### Solution Summary

The solution discusses the density of solids and liquids.

Density: To find Density of solid using graduated cylinder.

Problem:

A piece of solid metal weighing 322 grams is placed into a graduated cylinder, which is then filled with liquid mercury. The metal does not float. After weighing the cylinder and its contents the solid metal is removed and the cylinder is then filled with more liquid mercury to the same level as before. Now the cylinder and its contents weigh 110 grams LESS than before. If the density of mercury is 13.6 grams per cubic centimeter, determine the density of the solid metal.

I know that the Density of Mercury is 13.6 grams per cubic cm = mass/volume. And that the 110 grams less comes into this somewhere.

I also know that the Density of the Solid Metal = a mass of 322 grams/volume, and I think that the 110 grams less will also come into this.

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