Density Pre-Laboratory Questions

1. Which of the following units is correct when measuring density:
kg/m2; Pa; g/ml; kcal; kg/m3; J

2. If you have to work with two specimens of the same material and the volume of the first one is twice larger than the volume of the second – what can you conclude of the mass of the second sample compared to the mass of the first?

3. Mass of a given amount of water always equals its volume. What is density of water?

4. Compare densities of two samples: one is of wood and the other of plastic. Samples have different shapes. Mass and volume of wooden sample equal those of the plastic one.

5. How many significant figures contains each of following numbers: 2.39; 2.390; 0.0239; 0.2039; 2039; 4.00; 2039×10-4 ?

6. If volume of a water sample is 11.3 mL and the mass is 11.349 g, what is the exact density of the sample?

7. After four trials following densities of a metal sample were calculated:
7.62; 7.49; 7.84; 7.80
What is the average density of the metal?

Density Video

After watching the video, calculate average density of the specimens, based on the following data. Make sure you use the correct units.

Unknown 1

Mass, g Diameter (d), cm Height (h), cm Volume, cm3 Density, ?
1 7.359 1.54 1.5
2 9.430 1.54 1.9
3 12.505 1.54 2.5
4 16.017 1.54 3.2
5 22.151 1.54 4.4
6 23.880 1.54 4.7
Average Density

Unknown 2

Mass, g Diameter (d), cm Height (h), cm Volume, cm3 Density, ?
1 4.359 1.82 1.2
2 5.430 1.82 1.4
3 10.505 1.82 2.7
4 13.010 1.82 3.4
5 19.071 1.82 4.9
6 21.170 1.82 5.6
Average Density