Category «10th Class Science Notes»

10th Class Science Notes

10 Class- Periodic Classification of Elements

Periodic Classification of Elements In year of 1800 about 30 elements were known but at present we know about 114 elements. All these elements have different properties. So to study about these elements easily, scientists start searching some patterns in the properties to arrange these elements. Early Attempts in the Classification of Elements                                                                    This …

10 Class- Carbon and its Compounds

Carbon and Its Compounds Allotropes of Carbon – Fulleren-Diamond-Graphite ·             Instead of gaining and loosing electrons, carbon shares its 4-electrons with another element or carbon to form molecule. ·             Covalent bonds are formed as a result of sharing of electrons. Example- H2, O2, N2. Covalent compounds have low melting point and boiling point due to …

10 Class- Metals and Non-Metals

Metals and Non-Metals Metals             Metals are the solid materials which are typically hard, malleable, ductile and conduct heat and electricity, and also posses metallic lusture. Example- Iron, Gold, Aluminium, Silver, Copper etc. Non-metals                     Nonmetals are chemical elements which lacks metallic properties. Non metals are either solids or gases except Bromine (Br2), which occurs …

10 Class- Acids, Bases and Salts

Acids Bases and Salts ·       Natural indicator of acids and bases – Litmus, Turmeric ·       Synthetic indicator of acids and bases – Methyl Orange, Phenolphthalein ·       Olfactory indicators of acids and bases – Odor of these substance changes in acids and bases. pH scale for Acid Neutral and Alkaline (or Base) & Acid Base strength …

10 Class- Chemical Reactions and Equations

Chemical Reactions and Equations ·       Every chemical change is a chemical reaction. ·       General observation to identify whether a chemical reaction take place or not- 1.    Change in state. 2.    Change in color. 3.    Evolution of gas. 4.    Change in temperature. Chemical Equations: Any equation which describes the change of reactants to products is called …

Discovery of Electron

Discovery of Electron Sir J.J.Thomson and W.Crooks did many experiments with discharge tube for the discovery of electron. Discharge tube have tube like shape made from glass with two electrodes (Cathode -ve and Anode +ve) in vacuum created by vacuum pump connected to discharge tube. High electric potential is applied between two electrodes.   Discharge …