Question

in a science lab, the teacher provided michael with a triple - beam balance, a ruler, and four cube - shaped samples of unknown metals. he correctly calculated the densities and compared his calculations with the data table shown.

density of metals

metal	density
aluminum	2.7 g/cm³
iron	7.8 g/cm³
lead	11.3 g/cm³

based on michael’s calculations and the table shown, which conclusion can be best made about the investigation?
○ iron has the highest density.
○ aluminum has the lowest density.
○ weight is used to determine density.
○ substances can be identified by their density.

Explanation:

• Analyze each option:
• Option 1: Iron's density (7.8 g/cm³) is less than Lead's (11.3 g/cm³), so this is false.
• Option 2: Magnesium has a lower density (1.7 g/cm³) than Aluminum (2.7 g/cm³), so this is false.
• Option 3: Density is mass/volume, weight (force) isn't used to determine density directly, so this is false.
• Option 4: Each metal has a unique density (Magnesium:1.7, Aluminum:2.7, Iron:7.8, Lead:11.3), so substances can be identified by density. This is correct.

Answer:

Substances can be identified by their density.