9th Class Chemistry

Chemistry 9th Model Paper Half Book for Students Practice

Chemistry 9th                                                                   Objective Type Time Allowed:  15 minutes                                      Marks:  12 Note: You have four choices for each objective type question as A/B/C/ and D. The choice which you think is correct; fill that circle in front of that question number. Cutting or filling two or more circles will result in zero mark in that question. …

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Chemistry 9th – Important Definitions

Chemistry 9th              Important Definitions    Chapter#1            Fundamentals Of Chemistry     Science: word science is derived from “scientia” means “knowledge”. The knowledge that provides understanding of this world and how it works is called science. The knowledge obtained through observations and experiments is called science. Chemistry:The branch of science that deal with the composition, structure, properties …

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Chapter#8 Chemical Reactivity – 9th Class Chemistry Notes

Question#1) Define metals? What are the different groups of metals? Answer: METALS Metals are the elements (except hydrogen) which are electropositive and form cations by losing electrons.   Classification of Metals: Metals can be categorized. Very reactive:potassium, sodium, calcium, magnesium and aluminium. Moderately reactive :zinc, iron, tin and lead. Least reactive or noble :copper, mercury, …

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Chapter#7 Electrochemistry – 9th Class Chemistry Notes

Question#1: Define electrochemistry? Also write a detailed note on oxidation reduction reactions? ELECTROCHEMISTRY: Electrochemistry is the branch of Chemistry that deals with the relationship between electricity and chemical reactions. OXIDATION AND REDUCTION REACTIONS ON THE BASIS OF ADDITION OR REMOVAL OF OXYGEN: Oxidation: Oxidation is defined as addition of oxygen during a chemical reaction. Reduction: The …

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Chapter 6 Solution – 9th Class Chemistry Notes

Question#1) Write a note on solution and its components?  Answer: SOLUTION:  A solution is a homogeneous mixture of two or more substances. Example, the air we breathe is a solution of several gases, brass is a solid solution of Zn and Cu. Sugar dissolved in water is an example of liquid solution. Components of solution:  A Solution …

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Chapter 5 PHYSICAL STATES OF MATTER – 9th Class Chemistry

Question#1) What is Matter? Write a note on different physical states of matter? Answer: Matter: Any thing that has mass and occupy space is called matter. Matter exists in three physical states. 1) Gas.  2) Liquid.  3) Solid. 1) Gas or Gaseous state: State of matter that has neither fixed shape nor fixed volume is called …

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