problems involving heat flow and temperature changes

>A chemical equation is balanced so that the numbers of atoms of each type involved in a chemical reaction are the same on the reactant and product sides of the equation Equations must always be balanced. Equations are balanced by the hit and trial method. The rate of a chemical reaction ..

) from the steam chamber to the rod is In a time t, the chamber supplies a heat As the mass of the water collected in time t is m, the heat taken by the water is ------(ii) where s is the specific heat capacity of water. As the entire rod is covered with an insulating ..

Introduction - Do we use dry cells for operating electrical appliance? It is not impossible to tap continuous supply of energy from electrochemical cells. Electrical circuits in homes, factories and offices receive such energy form local power companies. In most countries the energy is supplied via..

Assuming isothermal conditions to prevail when sound travels through air, Newton has applied Boyle's law to the changes in pressure and volume. In a region of compression, there is a slight increase in temperature and in a region of rarefaction, there is a slight decrease in ..

Question: Global Warming - Climate An Introduction According to the National Academy of Sciences, the earth's surface temperature has risen by about 1 degree Fahrenheit in the past century, with accelerated warming during the past two decades. There is new and stronger evidence ..

Chemical Equations - A chemical equation is a shorthand way of describing the events that occur in a chemical change or reaction. The method of representing a chemical reaction with the help of symbols and formulae of the substances involved in it is known as a chemical equation..

. where r , called resistivity is a property of the material and depends on temperature and pressure. Electrical resistivity of substances varies over a very wide range. Metals have low resistivity, in the range of 10 - 8 W m to 10 - 6 W m. Insulators like glass and rubber have 10 2 2 to ..

Summary - In lower organisms, there is no transport system as the cells are in touch with the surrounding medium. The transport is by the physical processes like diffusion, osmosis, etc. With the advancement in structure, the organisms have to evolve methods to transport nutrients and wastes. The a..

Reversible Reactions, Irreversible Reactions and Equilibrium - It is a common observation that most of the reactions when carried out in closed vessels do not go to completion, under a given set of conditions of temperature and pressure. Infact in all such cases, in the initial state, onl..

When two substances at different temperatures are brought together, heat energy flows from a substance at higher temperature to a substance at lower temperature. The heat flow continues till their temperatures are equal..