Category «09th Class Science Notes»

09th Class Science Notes
09th Class Chemistry Notes

9 Class- Periodic Table of Elements

Periodic Table of Elements More than 115 elements have been discovered which need to be arranged systematically, first elements were classified as metals and non metals. History of classification of elements 1.     Prout’s Hypothesis – 1815 2.     Dobereiner’s Triads – 1829 3.     Newland’s Law of Octaves – 1863 4.     Lother Meyer Curves – 1869 5.     …

9 Class- Chemical Bonding and Reactions

Chemical Bonding and Reactions Chemical Bonding                              Molecule forms by the combination of two atoms of elements, the attraction force operate between atoms is known as Chemical Bonding. Chemical bonds are formed due to presence of valence electrons in atoms which present in outermost shell of atom. Question:Why chemical bonds are formed between atoms? Answer:Chemical …

Class 9 Chemical Bonding and Reactions SCIENCE LECTURE NOTES part 3

Chemical Bonding And Reactions    Chemical Reactions Chemical Reaction is the reaction in which two or more than two substances react to form a new substance is known as Chemical Reaction. The substances which react may be ion or compound of element. Reaction: Reactant reacts with each other to give product.                Reactant   ——–>  Product …

9 Class Chemical Bonding and Reactions SCIENCE STUDY NOTES part 2

Chemical Bonding and Reactions Covalent Compound Covalent bonds are the bonds which are formed due to the equal sharing of electrons between two atoms.  These chemistry notes are provided by Chemistry Notes Info Organization www.ChemistryNotesInfo.com , This type of bonds (i.e. covalent bonds) is formed in atoms which carry four or more than four electrons …

Class 9 Chemical Bonding and Reactions CHEMISTRY LECTURE NOTES part 1

CHEMISTRY LECTURE NOTES Chemical Bonding and Reactions Chemical Bonding                              Molecule forms by the combination of two atoms of elements, the attraction force operate between atoms is known as Chemical Bonding. Chemical bonds are formed due to presence of valence electrons in atoms which present in outermost shell of atom. Question:Why chemical bonds are formed …

9 Class Science- Periodic Table of Elements Part 2

Periodic Properties of the Elements Periodic properties are the properties of the elements which depend on their electronic configuration and these properties changes on moving down in the group and on moving left to right in the period of the periodic table. Some periodic properties are atomic size, electron affinity, ionization energy, metallic and non …

9 Class Science- Periodic Table of Elements Part 1

Periodic Table of Elements More than 115 elements have been discovered which need to be arranged systematically, first elements were classified as metals and non metals. History of classification of elements 1.     Prout’s Hypothesis – 1815 2.     Dobereiner’s Triads – 1829 3.     Newland’s Law of Octaves – 1863 4.     Lother Meyer Curves – 1869 5.     …

9 Class- Atomic Structure

Atomic Structure What is an atom? Matter found around us in nature (like iron rod, glass, cup, pen, pencil etc.) is made up from very small particles, which is known as atoms. we also says that “atoms are very small particles which made matter” so atom is fundamental unit of atom. Greek Philosopher, Democritus describe …

Discovery of Electron

Discovery of Electron Sir J.J.Thomson and W.Crooks did many experiments with discharge tube for the discovery of electron. Discharge tube have tube like shape made from glass with two electrodes (Cathode -ve and Anode +ve) in vacuum created by vacuum pump connected to discharge tube. High electric potential is applied between two electrodes.   Discharge …

9 Class Science- Atomic Structure Part 3

Structure of Atom Atomic Number Number of protons present in nucleus of atom of an element is known as atomic number. It is denoted by (z) example : Carbon have 6 protons so its atomic number is 6 (z = 6) For neutral atom,  atomic number (z) = number of protons (p) = number of …

9 Class Science- Atomic Structure Part 2

Atomic Structure Structure of Atom Many atomic models are proposed from time to time to show the actual structure of atom, some of them are described below- 1. Thomson’s atomic model 2. Rutherford’s atomic model 3. Bohr’s atomic model Thomson’s Atomic Model Thomson’s Atomic Model Thomson’s atomic model is first atomic model proposed in 1898 …

9 Class Science- Atomic Structure Part 1

Atomic Structure What is an atom? Matter found around us in nature (like iron rod, glass, cup, pen, pencil etc.) is made up from very small particles, which is known as atoms. we also says that “atoms are very small particles which made matter” so atom is fundamental unit of atom. Greek Philosopher, Democritus describe …