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\begin{tabular}{|c|c|}
\hline Mineral & \begin{tabular}{c}
Density \\
[tex]$\left( g / cm ^3\right)$[/tex]
\end{tabular} \\
\hline Diamond & [tex]$3.50-3.55$[/tex] \\
\hline Cubic zirconia & [tex]$5.50-5.90$[/tex] \\
\hline Common glass & [tex]$2.40-2.80$[/tex] \\
\hline Ruby & [tex]$3.90-4.10$[/tex] \\
\hline
\end{tabular}

1. If a rock sample has a mass of 1.17 g and a volume of [tex]$0.33 \, cm^3$[/tex], what type of rock is it? [tex]$\square$[/tex]

2. If a rock sample has a mass of 2.7 g and a volume of [tex]$1.1 \, cm^3$[/tex], what type of rock is it? [tex]$\square$[/tex]

3. If a rock sample has a mass of 11.2 g and a volume of [tex]$1.9 \, cm^3$[/tex], what type of rock is it? [tex]$\square$[/tex]


Sagot :

Let's solve the problem step by step by calculating the density for each rock sample and then determining its type based on the given density ranges.

### Step 1: Calculate the Densities

We start by using the formula for density:
[tex]\[ \text{Density} = \frac{\text{Mass}}{\text{Volume}} \][/tex]

#### Sample 1:
Mass = 1.17 g
Volume = 0.33 cm³

[tex]\[ \text{Density}_1 = \frac{1.17 \text{ g}}{0.33 \text{ cm}^3} = 3.545454545454545 \text{ g/cm}^3 \][/tex]

#### Sample 2:
Mass = 2.7 g
Volume = 1.1 cm³

[tex]\[ \text{Density}_2 = \frac{2.7 \text{ g}}{1.1 \text{ cm}^3} = 2.4545454545454546 \text{ g/cm}^3 \][/tex]

#### Sample 3:
Mass = 11.2 g
Volume = 1.9 cm³

[tex]\[ \text{Density}_3 = \frac{11.2 \text{ g}}{1.9 \text{ cm}^3} = 5.894736842105263 \text{ g/cm}^3 \][/tex]

### Step 2: Determine the Rock Types

Next, we compare the calculated densities with the given density ranges for different minerals.

#### Sample 1:
Density = 3.545454545454545 g/cm³

According to the table:
- Diamond: 3.50-3.55 g/cm³

This density falls within the range for Diamond. Thus, Sample 1 is a Diamond.

#### Sample 2:
Density = 2.4545454545454546 g/cm³

According to the table:
- Common glass: 2.40-2.80 g/cm³

This density falls within the range for Common glass. Thus, Sample 2 is Common glass.

#### Sample 3:
Density = 5.894736842105263 g/cm³

According to the table:
- Cubic zirconia: 5.50-5.90 g/cm³

This density falls within the range for Cubic zirconia. Thus, Sample 3 is Cubic zirconia.

### Conclusion

Summarizing the findings:
1. If a rock sample has a mass of 1.17 g and a volume of 0.33 cm³, it is a Diamond.
2. If a rock sample has a mass of 2.7 g and a volume of 1.1 cm³, it is Common glass.
3. If a rock sample has a mass of 11.2 g and a volume of 1.9 cm³, it is Cubic zirconia.