IX Chemistry - Chapter 8 - Electro-Chemistry

Electro-Chemistry The branch of chemistry which deals with the study of chemical energy to electrical energy or electrical energy to chemical energy is called electro-chemistry. Conductors Those substances through which electric current can pass are called conductors. For example all metals are conductors. Non-Conductors Those substances through which electric current cannot pass are called non-conductors. For example plastic,...

IX Chemistry - Chapter 7 - Solution and Suspension

Solution A homogeneous mixture of different chemical substances which has uniform chemical composition through out and shows uniform physical properties is called solution. For example dissolve a small amount of copper sulphate in water the water will become blue. If this blue liquid is filtered, it will pass through the filter paper without leaving any solid. The mixture thus prepared is called a solution. Binary Solution A solution...

IX Chemistry - Chapter 6 - States of Matter

States of Matter Matter has three states: 1. Gas 2. Liquid 3. solid These are physical states of matter. The three states of one matter may have different physical properties while their chemical properties are same. Water exists in three physical states solid (ice), liquid and gas(steam) has same chemical properties. Kinetic Theory of Matter The Kinetic theory was presented to explain the properties of gases and is called kinetic...

IX Chemistry - Chapter 4 - Periodicity of Elements and Periodic Table

Definitions Periodic Table A table of elements obtained by arranging them in order of their increasing atomic number in which elements having similar properties are placed in the same group is called Periodic Table. Group The vertical column of elements in the periodic table are called Groups. Period The horizontal rows of elements in the periodic table are called Periods. Periodicity The repetition of physical and chemical...

IX Chemistry - Chapter 3 - Atomic Structure

Dalton's Atomic Theory The important postulates of Dalton's atomic theory are: 1. All elements are composed of atoms. Atom is too small so that it could not be divided into further simpler components. 2. Atom cannot be destroyed or produced. 3. Atoms of an element are similar in all respects. They have same mass and properties. 4. Atoms of different elements combine in a definite simple ratio to produce compounds. Discovery of Electron...

IX Chemistry - Chapter 2 - Chemical Combinations and Chemical Equation

Laws of Chemical Combinations There are four laws of chemical combinations these laws explained the general feature of chemical change. These laws are: 1. Law of Conservation of Mass 2. Law of Definite Proportions 3. Law of Multiple Proportions 4. Law Reciprocal Proportions Antoine Lavoiser has rejected the worn out ideas about the changes that take place during a chemical reaction. He made careful quantitative measurements in chemical...

IX Chemistry - Chapter 1 - Introduction to Chemistry

Chemistry The branch of science which deals with the composition and properties of matter, changes in matter and the laws or principles which govern these changes is called Chemistry. Branches of Chemistry Physical Chemistry The branch of chemistry which deals with the physical properties and physical behavior of material things is called physical chemistry. Inorganic Chemistry The study of all elements and their compounds except...