Question

density practice
determine the substance or sample given the information in the data table provided.
substance density g/cm³
germanium 5.32
iron 7.87
lead 11.3
mercury 13.6

1. a student has a sample of an element that has a volume of 6.7 cm³ and a mass of 75.71 g. based on the density, which element on the table could it be?

substance density g/cm³
gold 19.3
iron 7.87
lead 11.3
tin 7.2

1. a sample of an unknown substance has a mass of 28.8 grams and a volume of 4 cm³. based on its density, it could be which of the following substances?

sample mass volume
1 89 g 75 cm³
2 26 g 15 cm³
3 23 g 100 cm³
4 160 g 125 cm³

1. a student has a substance with a density of 1.28 g/cm³. which sample does the student have?

Explanation:

Step1: Calculate density

Density = mass / volume = $75.71\ \text{g} / 6.7\ \text{cm}^3 \approx 11.3\ \text{g/cm}^3$

Step2: Match with table

11.3 g/cm³ corresponds to Lead.

Step1: Calculate density

Density = $28.8\ \text{g} / 4\ \text{cm}^3 = 7.2\ \text{g/cm}^3$

Step2: Match with table

7.2 g/cm³ corresponds to Tin.

Step1: Calculate sample 4 density

Density = $160\ \text{g} / 125\ \text{cm}^3 = 1.28\ \text{g/cm}^3$

Step2: Identify sample

Matches the given density.

Answer:

1. Lead
2. Tin
3. Sample 4