Explain why we can easily move our hand in air but to do the same through a plank of wood, we need a karate expert.
why does the temp. remains constant during the melting of ice even thoug heat is supplied contiously?
Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy, and density. Also, please compare these properties with solids, liquids and gases.
Define latent heat of fusion
A sponge can change its shape by pressing but it is a solid. How is it possible ?
how can show that particles matter have spaces between them?
When 3.2 g of Sulphur is vaporized at 450oC and 723 mm pressure, the vapors occupy a volume of 780 ml. What is the molecular formula of sulphur vapours under these conditions? Calculate the vapor density also.
(a)air is used to make inflate tyres.
(b)steel is used to make railway lines.
A wet khus khus screen hung at the door keeps the room cool. why? THis is the question in my unit test . I have written answer as " A wet khus khus keeps the room cool if hung at the door because the water particles in khus khus gains energy from the surrounding to evoporate and thus leaves the surrounding cool." I got 50% marks for the answer. What should be the answer so that i get full marks.
why does the temperature of a substance remain constant during its melting point or boiling point ?
Describe the process of sublimation and its applications.
activity to show that gases are highly compressible than solids and liquids ?
why do we need pressure cooker to cook rice at hill stations
examples of application of evaporation used in our daily life
do an activity to show that particles of matter are very small beyond our imagination
the particles of "X" are observed to undergo Brownian motion. what kind of substance is "X" ?
a) aqueous solution b) true solution
c) suspension d) collloidal solution
why do trees acquire more leaves during summer?
Boiling water can extinguish fire more quickly then ice or cold water. Why?
1. Why should curd and sour substances not be kept in brass and coppervessels?
give reason water at room temperature is a liquid
Explain the interconversion of 3 states of matter in terms of force of attraction and kinetic energy of molecules.
what is the meaning of fixed volume
how can we seperate mixture of iodine and ammonium chloride
Copyright © 2019 Applect Learning Systems Pvt. Ltd. All rights reserved.