Ways to Manage Our Resources The environment includes our physical surroundings like air, water, soil and all the organisms such as plants, animals, human beings and micro-organisms like bacteria and fungi (called decomposers). The system of controlling…

Need To Manage Our Resources We need to manage our resources because the resources of the earth are not unlimited and with the human population increasing at a tremendous rate due to improvement in healthcare. If the natural resources are managed proper…

Print Culture and the Modern World Class 10 MCQs Questions with Answers Question 1. Who brought hand printing technology to Japan? (a) The Arab travelers in the 8th century (b) Chinese silk merchants in the 6th century (c) The Egyptians in the AD 800 (d…

Types Of Chemical Reactions Chemical reactions involve the breaking of bonds present in reactant atoms and forming new bonds in products. Some of the important types of chemical reactions are described next: Combination Reaction (A + B → AB) Those react…

Corrosion: The process in which metals are eaten up gradually by the action of air, moisture or a chemical such as acids on their surface is called corrosion. For example, rusting of iron metal is the most common form of corrosion. 4Fe + 3CO2 + 2x H2O →…

Acids: On the basis of their chemical properties, all the chemical compounds can be classified into: Acids Bases Salts In this chapter, we will be studying the various properties of acids and bases, synthetic, natural, and olfactory indicators, behavi…

Bases: Bases are chemical substances that have a bitter taste, are soapy to touch, and turn red litmus blue. A base is a substance that dissolves in water to produce hydroxide ions (OH–) in the solution. NaOH(s) → Na+(aq) + OH–(aq) Classification of Bas…

Chemical Reactions: We come across a variety of changes that take place around us in our daily life. These changes may be physical changes or chemical changes. In this chapter we will study chemical reactions and their characteristics, balancing chemica…

Strength Of Acid And Bases The strength of acids and bases depends on the number of H+ ions and OH– ions produced, respectively. More the number of H+ ions produced in solution, stronger is the acid and more the number of OH– ions produced in solution, …

Salts: Salts are produced when an acid reacts with a base and such reactions are known as neutralization reactions. Family of Salts: Salts having the same positive or negative radicals are said to belong to the same family. Examples: NaCl and Na2SO4 be…