Introduction We all know that various things or living things can be classified on the basis of their properties. Even in shops, various items belonging to the same category are kept together in groups. For example, soap is kept together in one place, biscuits are kept together elsewhere. Similarly, scientists made several attempts to classify …
Class 10 Chapter 5 Periodic Classification of Elements Read More »
Introduction All living and non-living things are based on carbon. For example, food, medicines, books, clothes and many others. Carbon is an element of immense importance both in its combined form as well as in elemental form. Earth’s crust contains 0.02% of carbon in the form of carbonates, coal petroleum and the atmosphere contain only …
Introduction The taste of the food that we eat depends on the presence of acids and bases in them. Acids are sour in taste and change the colour of blue litmus to red. Bases are bitter in taste and change the colour of red litmus to blue. Litmus and turmeric are natural indicators. Some other …
Introduction Any type of change can be classified as physical change or chemical change. Physical changes can be reversed easily but chemical changes are mostly irreversible because in chemical changes new substances are formed and it is very difficult to obtain the original substances back. We can say that whenever a chemical change occurs, a …
Class 10 Chapter 1 Chemical Reactions and Equations Read More »
