Question

Which statements describe density? Check all that apply. Density is a chemical property of an object. The density of an object is constant. Density is a derived unit of measure. Density is the sum of the mass and volume of an object. The density of an object determines whether it will sink or float.

Answer 1

The only statement on the options that says true about density is:
> The density of an object determines whether it will sink or float.

Why?
Density is a physical property of an object.
Density is not derived as a unit of measure. It is derived from 2 fundamental units: kg and m.
The Density of an object is not constant.
Density is calculated by dividing the mass by the volume of an object.

Answer 2

The correct answer to the question is - the density of an object determines whether it will sink or float.

EXPLANATION:

The density of a substance is defined as mass per unit volume.

Let us consider a body whose mass is m and volume v.

Hence, density of a substance is written as -

                               density $d=\frac{m}{v}$.

Hence, density is a derived quantity as it is obtained from mass and volume. But, it is not a derived unit. So, it is not a derived unit of measure.

Density of a substance is a physical intensive property. It can not be considered as an chemical property.We can measure the density of a  substance without changing of its chemical composition or identities.

The density of a substance is independent of mass and size of the object. But, it is not a constant quantity. For solids, the density of a substance may be constant as atoms are closely bound to each other. But for gases and liquids, the density is not constant. It is dependent on temperature and other parametres.

Density of a substance gives the idea whether the substance will sink or float. If the density of a substance is more as compared to the liquid, then it will sink. Otherwise it will float.