Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

1. Matter and Measurements

Density

GOB Chemistry

1. Matter and Measurements

Density

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2:26 minutes

Problem 75

Textbook Question

In an old trunk, you find a piece of metal that you think may be aluminum, silver, or lead. You take it to a lab, where you find it has a mass of 217 g and a volume of 19.2 cm³. Using TABLE 2.8, what is the metal you found?

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Step 1: Recall the formula for density, which is given by \( \text{Density} = \frac{\text{Mass}}{\text{Volume}} \). This formula will help us calculate the density of the metal using the given mass and volume.

Step 2: Substitute the given values into the formula. The mass is 217 g, and the volume is 19.2 cm³. The equation becomes \( \text{Density} = \frac{217}{19.2} \).

Step 3: Perform the division to calculate the density of the metal. This will give you the density in units of g/cm³.

Step 4: Compare the calculated density to the densities of aluminum, silver, and lead provided in TABLE 2.8. Each metal has a characteristic density, so the closest match will identify the metal.

Step 5: Based on the comparison, determine which metal (aluminum, silver, or lead) has a density that matches the calculated value. This will allow you to identify the metal found in the trunk.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Density

Density is defined as the mass of an object divided by its volume, typically expressed in grams per cubic centimeter (g/cm³). It is a fundamental property that helps identify materials, as different substances have unique densities. In this case, calculating the density of the metal found will allow for comparison with known densities of aluminum, silver, and lead.

Material Properties

Material properties refer to the characteristics that define how a material behaves under various conditions. For metals, properties such as density, melting point, and conductivity are crucial for identification. Understanding these properties helps in distinguishing between metals like aluminum, silver, and lead, each of which has distinct physical and chemical attributes.

Reference Tables

Reference tables, such as TABLE 2.8 mentioned in the question, provide standardized data for various materials, including their densities. These tables are essential tools in scientific analysis, allowing for quick comparisons and identifications based on measured values. By consulting such a table, one can determine which metal corresponds to the calculated density of the found object.

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