Which option correctly defines density and its calculation?

QUESTION 12:
To find the volume of the stone, subtract the initial volume of the liquid from the final volume of the liquid with the stone.
Volume of stone = Final volume - Original volume

$$V_{\text{stone}} = 35 \text{ mL} - 25 \text{ mL} = 10 \text{ mL}$$

The correct option is C.

$$\boxed{\text{C. } 10 \text{ mL}}$$

QUESTION 13:
The mass of one cubic metre of a substance is the definition of density. Density is mass per unit volume.
The correct option is D.

$$\boxed{\text{D. density}}$$

QUESTION 14:
Density is calculated by dividing mass by volume.
Given:
Mass ($m$) = 50 g
Volume ($V$) = 5.8 cm³
Density ($\rho$) = $\frac{m}{V}$

$$\rho = \frac{50 \text{ g}}{5.8 \text{ cm}^3}$$ $$\rho \approx 8.62 \text{ g/cm}^3$$

Rounding to one decimal place, the density is approximately 8.6 g/cm³.
The correct option is D.

$$\boxed{\text{D. } 8.6 \text{ g/cm}^3}$$

QUESTION 15:
The gravitational force of the Earth, also known as the gravitational field strength ($g$), is approximately 9.8 N/kg. A common approximation used is 10 N/kg.
The correct option is C.

$$\boxed{\text{C. } 10 \text{ newtons per kilogram.}}$$