Class 10th

ELECTRICITY CLASS 10 Q.) What is electricity?  Ans:- Electricity is the form of energy.  Or ➡️Electricity is the flow of electrons.  ➡️Electricity is the flow of electrical power or charge.  Q.) What is charge?  Ans:- That property of matter due to which they exert electrical forces on each other, called charge.  ➡️It is an intrinsic property.  ➡️Intrinsic :- It can't be removed.  ➡️ Charge at rest :- produces only electrical effect.  ➡️Charge in motion :- produces both (i) Electrical and (ii) Magnetic effects.  Q) What is an electric charge? Is it a scalar or vector quantity? Give S.I . unit.  Ans:- Electric charge is a physical quantity which causes electric force in matter.  ➡️Charge is denoted by Q/q.  ➡️The electric charges at rest are known as static charge.  ➡️Charge is a scalar* quantity. ➡️SI unit of charge is coulomb (C).  ➡️Dimensional formula of charge is [AT].  Types of charge 

  EFFECT OF OXIDATION IN OUR DAILY LIFE Q. What is rusting?  Ans - The process of rust formation in presence of oxygen and water or water vapour is called rusting.  🔑Keys points 🗝️ ➡️Moisture  ➡️Acid: higher pH inhibits the Corrosion of iron.  ➡️Salt: Iron tends to rust faster in the sea, due to presence of various salts.  ➡️Impurity : Pure iron tends to rust more  slowly when compared to iron containing a mixture of metals.  These are affecting the rust.  What is Corrosion?  Ans - Chemical action on the surface of metals by moisture, air or chemicals is called Corrosion.  Ex- black layer on silver, green layer on copper etc.  ➡️Rusting of iron is a redox reaction. What is Rancidity?  Ans :- The process of Oxidation of fats and oils that can be easily noticed by the change in taste and smell is called Rancidity.  Ex- the taste and smell of butter changes when kept for long.  Q. How can be reduced Rancidity?...

  Type of chemical reactions 1.) Combination Reaction :- When two or more substances (elements or compounds) combine to form a single product. Whose properties are entirely different from the original substance.  Ex -                 A  +   B    ->    C i. When coal burns in presence of air it produce carbon dioxide gas .  C (g) + O2(g) -> CO2 (g)  ii. When hydrogen combines with oxygen it forms water.  H2 (g) + O2(g) -> H2O(l)  Note :- In this reaction heat is produced.  ➡️Exothermic reactions :- The reactions, in which heat is generated in course of formation of product, are Exothermic reaction.  Ex-  a.) CH4 (g) + 2O2(g)  -> CO2 (g) +2H2O (g) +        energy  2) Decomposition Reactions :-  In this reaction, a substance is broken down into two or more new substances whose properties are different from the original s...

  CHEMICAL REACTIONS AND EQUATIONS Course Content I) Introduction II) Types of changes III) Chemical Reactions IV) Chemical Equations V) Different types of chemical reactions VI) Oxidation and reduction reaction VII) Oxidising and reducing agents VIII) Balancing of chemical equations IX) Corrosion and Rusting (prevention of rusting ) X) Rancidity >Write the difference between physical and chemical change. 1)Physical change :- ➡️It is a temporary change.  ➡️It affects only physical properties i. e shape, size etc.  ➡️It involves very little to absorption* of energy.  ➡️For example - freezing of water, melting of wax, boiling of water etc.  ➡️It do not involve the production of energy.  ➡️No, new substance is formed.  ➡️It is easily reversible i. e original substance can be reformed.  Chemical changes :- ➡️It is a permanent change.  ➡️It has both physical as well as chemical properties of the substance including its composition.  ➡️In t...

CHEMISTRY CLASS - XTH ALL CHAPTERS NOTES ➡️Chapter - 01  I) Chemical Reactions and Equations click below 👇

 Question 1: What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration? Answer Terrestrial organisms take up oxygen from the atmosphere whereas aquatic animals need to utilize oxygen present in the water. Air contains more O2 as compared to water. Since the content of O2 in air is high, the terrestrial animals do not have to breathe faster to get more oxygen. Therefore, unlike aquatic animals, terrestrial animals do not have to show various adaptations for better gaseous exchange. Question 2: What are the different ways in which glucose is oxidized to provide energy in various organisms? Answer Glucose is first broken down in the cell cytoplasm into a three carbon molecule called pyruvate. Pyruvate is further broken down by different ways to provide energy. The breakdown of glucose by different pathways can be illustrated as follows. In yeast and human muscle cells, the breakdown of pyruvate occurs in the ...