Answer the following questions in about twenty words.
1. How does density of a substance change with temperature ?
2. Define density of a substance. Write its unit. You are given a piece of copper, how will you determine
its density ?
3. How is the floating/sinking tendency of a substance related to its density ?
4. Density of a solid is 3 g/cm Express it in kg/m
5. Calculate volume of 1 kg solid if its density is 0.5 g/cm
Answers
Answer:
1. if the temperature of a substance increases, then the density also increases. while the density of the substance decreases when the temperature is decreased.
2. density of a substance is the mass per unit volume of that substance. it is calculated using the formula mass/volume or m/v. density is represented as 'd'.
the unit of density in S.I. System is kilogram per cubic metre or kg/m^3 and the unit of density in C.G.S System is gram per cubic centimeter or g/cm^3.
the determine the density of a piece of copper, we need to know the mass and volume of the given piece of copper.
3. if the density of a substance is more than the density of water, then the substance will sink in water. if the density of a substance is less than the density of water, then the substance will float in water.
4. 1 g/cm^3 = 1/1000 kg/m^3.
therefore, 3 g/cm^3 = 3/1000 kg/m^3
= 0.003 kg/m^3.
5. given,
density = 0.5 g/cm^3 =0.0005 kg/m^3;
mass = 1kg.
we know,
density = mass/volume;
therefore, volume = mass/density
= volume= 1kg/0.0005 kg/m^3
= volume = 2000 m^3.