Structure of the Atom Notes Sub atomic particles:- Electron , proton and neutron. Electron was identified by J.J. Thomson in 1897, proton was identified by E. Goldstein in 1886 and neutron was identified by James Chadwick in 1932. The mass of proton is approximately 2000 times as that of the electron. The charges of proton […]
Atoms and Molecules Notes Laws of chemical combination:- Law of conservation of mass:- It states that mass can neither be created nor be destroyed in a chemical reaction. Or,It states that the total mass of reactants is equal to total mass of products in a chemical reaction. Law of constant proportion:- It states that in […]
Is Matter Around Us Pure Important Questions State the differences between compounds and mixtures. What are alloys? What are the constituents of brass? Differentiate between colloid, solution and suspension. a. What is Tyndall effect? Does true solution exhibit Tyndall effect?b. “Tyndall effect can be seen when sunlight passes through the canopy of forest.” Explain how […]
Is Matter Around Us Pure Notes Pure substance:- A pure substance consists of a single type of particles that cannot be separated into other kinds of matter by any physical process. Types of pure substances:- Element Compound Element:- An element is a basic form of matter that cannot be broken down into simpler substances by […]
Matter In Our Surroundings Important Questions Why do we see water droplets collected on the outer surface of a container containing ice cold water? Explain why temperature remains constant during interconversion of states of matter? Why do people sprinkle water on the roof after a hot sunny day? Why is ice at 273 K more […]
Matter In Our Surroundings Notes Physical Nature of Matter:- Matter is made up of particles. Particles of matter are very small that we can’t see by our naked eyes. Characteristics of Particles of Matter:- Particles of matter have space between them. Particles of matter are continuously moving. Particles of matter attract each other. We can […]