Define the terms density and relative density. Give their units.

Solution

Density of a substance is defined as its mass per unit volume.

Mathematically, we can write,

$D e n s i t y = \frac{Mass}{Volume}$

The SI unit of density is kilogram per cubic metre (kg m^–3).

Relative density of a substance is the ratio of the density of the substance to the density of water.

Therefore,

$Relative density = \frac{Density of a substance}{density of water}$

Since the relative density is a ratio of two similar quantities, it has no units.

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Atoms And Molecules

Define the terms density and relative density. Give their units.

Some More Questions From Atoms And Molecules Chapter

What is the mass of?

(a) 0.2 mole oxygen atoms.

(b) 0.5 mole of water molecules.

Calculate the number of molecules of sulphur (S₈) present in 16 gm of solid sulphur.

Calculate the number of aluminium ions present in 0.56 gm of aluminium oxide.

Explain law of conservation of mass.

50 g of 10% lead nitrate is mixed with 50 g of 10% sodium chloride in a closed vessel. After the reaction has taken place, it was found that 6.83 g of lead chloride was precipitated. Besides, the reaction mixture contained 90 g water and sodium nitrate. Calculate the amount of sodium nitrate formed.

Name and explain two important laws of chemical combination ?

What are the postulates of Dalton’s atomic theory of matter?

Hydrogen and oxygen combine in two different ways to produce water and hydrogen peroxide. Which of Dalton’s law does this observation confirm? Explain.

State drawbacks of Dalton’s atomic theory of matter.

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For Daily Free Study Material Join wiredfaculty

Atoms And Molecules

Define the terms density and relative density. Give their units.

Some More Questions From Atoms And Molecules Chapter

What is the mass of? (a) 0.2 mole oxygen atoms. (b) 0.5 mole of water molecules.

Calculate the number of molecules of sulphur (S8) present in 16 gm of solid sulphur.

Calculate the number of aluminium ions present in 0.56 gm of aluminium oxide.

Explain law of conservation of mass.

Name and explain two important laws of chemical combination ?

What are the postulates of Dalton’s atomic theory of matter?

Hydrogen and oxygen combine in two different ways to produce water and hydrogen peroxide. Which of Dalton’s law does this observation confirm? Explain.

State drawbacks of Dalton’s atomic theory of matter.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

What is the mass of?

(a) 0.2 mole oxygen atoms.

(b) 0.5 mole of water molecules.

Calculate the number of molecules of sulphur (S₈) present in 16 gm of solid sulphur.