short note on chapter 1 chemistry class 9

chapter-1

Matter in our surrounding

Matter- The substance that occupies the volume and mass is called matter.

States of matter-

1. Solid

2. Liquid

3. Gas

4. Plasma

5. Bose Einstein condensate

Charactersitcs of perticles of matter-

1. Particles of matter are in the state of continoues moment.

2. Particles of matter are attract each other.

etc.

Change of states of matter-

Solid to liquid- Fusion

Liquid to solid- Freezing

Liquid to gas – vapourisation

Gas to liquid- condensation

Gas to solid- solidification

Solid to gas- sublimation

Conversion of temperature-)

Comments

Periodic table

Periodic table ELEMENTS- Elements are pure from of matter that are made up of one type of atom. · DOBEREINER- Grouped all elements in three (triads). · NEWLAND- Observed that when elements are arranging in increasing order of their atomic mass. Every eighteen element beginning from any element resemble the first element in its physical and chemical properties. · DMITRI MENDLEVE- He is a Russian chemist gave the first periodic table of elements based on his law which states that “The properties of elements are the periodic functions of their atomic mass.” · Modern periodic table was given by HENERY MOSELEY. Periodic table- A tabular form of elements in group and periods highlighting the regular trends in...

J.J Thomson

J.J. THOMSON J.J. Thomson was born on December 18, 1856, in Cheetham Hill, England, and went on to attend Trinity College at Cambridge, where he would come to head the Cavendish Laboratory. His research in cathode rays led to the discovery of the electron, and he pursued further innovations in atomic structure exploration. Thomson won the 1906 Nobel Prize in Physics, among many accolades. He died on August 30, 1940. In 1906, Thomson began studying positively charged ions, or positive rays. This led to one of his other famous discoveries in 1912, when he channeled a stream of ionized neon through a magnetic and an electric field and used deflection techniques to measure the charge to mass ratio. In doing so, he discovered that neon was composed of two different kinds of atoms, and proved the existence of isotopes in a stable element. This was the first use of mass spectrometry. Personal Life and Later Years Thomson married Rose Paget, one of his students, in 1890. They ...

Robots

Robots A robot is a machine—especially one programmable by a computer— capable of carrying out a complex series of actions automatically. Robots can be guided by an external control device or the control may be embedded within. Robots may be constructed on the lines of human form, but most robots are machines designed to perform a task with no regard to their aesthetics. Robots can be autonomous or semi-autonomous and range from humanoids such as Honda's Advanced Step in Innovative Mobility (ASIMO) and TOSY's TOSY Ping Pong Playing Robot (TOPIO) to industrial robots, medical operating robots, patient assist robots, dog therapy robots, collectively programmed swarm robots, UAV drones...

Ragita Academy

Search This Blog