Particulate Nature of Matter - Gaseous state

Grade 8CBSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

•

In the gaseous state, particles are far apart from each other, meaning there are large intermolecular spaces between them.

•

The force of attraction between the particles is negligible, allowing them to move freely in all directions.

•

KE

•

Gases have neither a definite shape nor a definite volume; they acquire the shape and volume of the container they are kept in.

•

CNG

•

The rate of diffusion is highest in gases because of the high speed of particles and large spaces between them. This is why the smell of hot food reaches us even from a distance.

•

Gaseous particles exert pressure on the walls of the container due to the continuous bombardment of particles against the surface.

📐Formulae

\text{Density } (\rho) = \frac{\text{Mass } (m)}{\text{Volume } (V)}

T(K) = T(^\circ C) + 273.15

\text{Pressure } (P) = \frac{\text{Force } (F)}{\text{Area } (A)}

KE = \frac{1}{2}mv^2

💡Examples

Problem 1:

35^\circ C

Solution:

T(K) = 35 + 273.15 = 308.15 K

Explanation:

273.15

Problem 2:

0.5 kg

Solution:

\rho = \frac{0.5}{2} = 0.25 kg/m^3

Explanation:

\rho = \frac{m}{V}

Problem 3:

500 N

Solution:

P = \frac{500}{2} = 250 N/m^2 \text{ (or Pascal)}

Explanation:

P = \frac{F}{A}