Important points and formula of chemistry for class 9 chapter-Matter in our surrounding

Science Formulas

Everything in this universe is made up of matter. Matter is defined as anything which occupies space, possesses mass and the presence of which can be felt by any one or more of our five senses, i.e., sight, touch, smell, hearing and taste.

States of Matter

matter in surrounding

  • Directly proportional to the product of the masses of the objects and
  • Inversely proportional to the square of the distance between their centres

Matter around us exists in three states, i.e., solid, liquid and gas. These three states differ from one another dur to the difference in the size of spaces in between the constituent particles, their forces of attraction and kinetic energies.

Differences in the characteristics of states of matter (solids, liquids & gases)

S.No. Property Solid Liquid Gas
1. Packing The particles are most closely packed The particles are less closely

packed than solids.

Particles are at sufficient distances

from each other.

2. Shape Solids have definite shape. Liquids do not have definite shape.

They assume the shape of container.

Gases do not have a definite shape.

They assume the shape of container.

3. Volume Solid have definite volume. Liquids have definite volume. Gases do not have definite volume.

They assume the volume of container.

4. Density Solids have high density. Liquids have less density than

solids but more than gases.

Gases have the least density.
5. Diffusion Solids have no tendency to diffuse. Liquids have a tendency to diffuse slowly. Gases diffuse rapidly.
6. Rigidity Rigid. Fluid. Fluid.
7. Compressibility Negligible. Very low. High.
8. Inter-molecular forces of attraction Maximum. Less than solids. Negligible.
9. Kinetic energy of molecules Least. More than solids. Very high.

Do solve NCERT Solution with the help of NCERT Solutions for class 9 Science prepared by academic team of Physics Wallah. For additional information related to the subject you can check the Science Formula section.

 

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Important points and formula of chemistry for class 9 chapter-Matter in our surrounding

Important points and formula of chemistry for class 9 chapter-Matter in our surrounding

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