Class10th Notes

(chemical reactions are the processes in which new substances with new properties are formed) --the substances which take part in a chemical reaction are called reactants --the new substances produced as a result of chemical reaction are called products when a magnesium ribbon is heated it burns in air with a dazzling white flame to form a white powder called magnesium oxide, on heating Magnesium oxide combines with oxygen present in air to form magnesium oxide,example                                       (heat) Magnesium   +  oxygen  ---> Magnesium oxide (As ribbon)       (from air)       (white powder) this is an example of chemical reaction... {characteristics of Chemical reactions} Evolution of gas. Formation of a precipitate. Change in color. Change in temperature. Change in state. Formation of new substances 1.}Evolution of ...