Try to identify the metal: the cube is 2.5 on each side and has a mass of 140 grams

To identify the metal, we can calculate the density of the cube using the formula:

\[
\text{Density} = \frac{\text{Mass}}{\text{Volume}}
\]

1. **Calculate the Volume of the Cube:**
   Since the cube has sides of 2.5 cm, the volume \( V \) is given by:

   \[
   V = \text{side}^3 = 2.5^3 = 15.625 \, \text{cm}^3
   \]

2. **Calculate the Density:**
   Given the mass \( m \) is 140 grams:

   \[
   \text{Density} = \frac{140 \, \text{g}}{15.625 \, \text{cm}^3} \approx 8.96 \, \text{g/cm}^3
   \]

3. **Identify the Metal:**
   The calculated density is approximately 8.96 g/cm³. This density closely matches that of **copper**, which has a known density of about 8.96 g/cm³.

### Conclusion:
The metal of the cube is likely **copper**.

Would you like more details or have any questions? 

Here are some related questions:
1. How does temperature affect the density of a metal?
2. What are common uses for metals with a density around 9 g/cm³?
3. How do you determine the accuracy of density measurements?
4. What are other methods for identifying a metal besides density?
5. How does the atomic structure of copper contribute to its density?

**Tip:** Always compare calculated density with a reference table to identify the material accurately.

Learn how to identify a metal cube by calculating its density. Detailed step-by-step solution using the cube's dimensions and mass. Suitable for high school students studying physics or chemistry.

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