Table of Densities of Common Metals: Use the table to identify the metal in each case: Name of Metal: Magnesium, Aluminum, Titanium, Vanadium, Zinc, Steel, Brass, Copper, Silver, Lead, Palladium, Gold, Platinum, Bismuth, Uranium, Iron Density (g/cm^3): 1.74, 2.72, 4.5, 5.494, 7.14, 7.85, 8.52, 8.94, 10.5, 11.3, 12.0, 19.3, 21.4
The Correct Answer and Explanation is:
How to Identify a Metal Using Density
Density is a characteristic physical property of a substance, defined as its mass per unit volume (g/cm³ for solids). When you are given the density of an unknown metal, you can compare it with the values in the density table to find the closest match, and thus identify the metal.
Sample Example:
Let’s say you’re given a metal with a density of 8.94 g/cm³. Looking at the table:
| Metal | Density (g/cm³) |
|---|---|
| Copper | 8.94 |
The metal that matches exactly is copper, so this is your answer.
Explanation
Identifying metals based on their density is a fundamental technique in materials science and chemistry. Density is a unique physical property for pure substances, meaning that each metal has a distinct density under standard conditions. This makes it a reliable method for identification, especially when no chemical analysis tools are available.
To identify a metal using the table, you compare the given density of the unknown sample to the list of known densities. The metal whose density matches or comes very close to the given value is the likely identity of the sample. Precision is key: small differences might occur due to measurement error or impurities, but a close match is usually sufficient.
For instance, if a sample has a measured density of 8.94 g/cm³, we can look up that value in the table. Copper is listed with a density of 8.94 g/cm³, so we conclude that the sample is copper. This method is particularly helpful in recycling and metallurgical industries where rapid identification of metal types is crucial.
However, this method is most effective for pure metals. If the sample is an alloy (a mixture of metals), its density might fall between the densities of its components, making identification less straightforward without additional information.
In conclusion, by measuring a metal’s density and comparing it with known values, we can accurately identify it using a reference table like the one provided
