high school chemistry set

Cement absorbs water on mixing to form a gelatinous mass. This sets to a hard mass and is very resistant to pressure. This process is called the setting of cement. This simple looking process involves a complicated set of reactions of hydration and hydrolysis, leading..

Set up the apparatus as shown in figure 6.10. Liquor ammonia is taken in the test tube and boiled. It decomposes to yield ammonia gas and water vapour. The ammonia combines with the chlorine, forming thick white fumes of ammonium chloride. (ii) Ammonia with excess chloride If the chl..

Highly Magnified Yeast Cells The dilute solution obtained as above is taken in big fermentation tanks and some yeast is added (5% by volume). The temperature is maintained at 330K and the mixture is allowed to stand for a few days. Fermentation sets in and the enzyme (organ..

Ceramics - Besides being useful, chemicals find use in artifacts as well. Ceramics, paints, varnishes, glass, cement are various other useful substances that contain various chemicals as their components. Construction industry is the major beneficiary of such substances. Of late, continuing researc..

The controlled combustion of fuel in the presence of air, gives an internal combustion engine its power. A low quality fuel does not burn smoothly and causes an occasional explosive sound, which is known as knocking. This greatly reduces the power of the engine. The quality of a fuel is indicated ..

. D m the mass defect or the mass converted into energy is given by D m = 236.127 - 235.846 = 0.281 amu 1 amu = 931.48 MeV \ Energy released = 0.281 amu = 931.48 x 0.281 = 261.75 MeV The neutrons emitted from the fission of first uranium atom hit other uranium nuclei and cause their fission resulti..

>When neither the metal atom (M), nor the metal ion Mn+ undergo any change no charge is developed on the electrode relative to the solution. If the metal has relatively high tendency to get oxidized, its atoms will lose electrons readily and form Mn + ions, which go into the solution. The..

) molecules in precise orientations and to stabilize transition states in the making and breaking of bonds. Enzymes are highly specific. An enzyme usually catalyses a single chemical reaction or a set of closely related reactions. For e.g., urease catalyses the hydrolysis of ure..

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..

Nitrogen readily combines with highly electropositive metals (Group 1), even at room temperature, to give nitrides. For example,..