MATERIAL REQUIRED Convex Lens, Optical Bench THEORY A lens is a piece of transparent material which concentrates or disperses light rays when passes through them by refraction. According to the shape and purpose of the lens, they are classified into two types convex lens and concave lens. A lens that is thicker at its center […]
TO DETERMINE FOCAL LENGTH OF CONVEX LENS Read More »
MATERIALS REQUIRED Round bottom flask, delivery tube with cork, water trough, beehive shelf, gas jar, tripod stand with wire gauze, stand with clamp, Bunsen’s burner, sodium nitrite, ammonium chloride. THEORY Nitrogen is one of the inactive gases. However, it has a significant role to play in the life of plants and animals. It is also
TO PREPARE NITROGEN GAS IN LABORATORY Read More »
MATERIAL REQUIRED Beaker, short stem funnel, test tube, spirogyra or hydrilla plant, sodium bicarbonate. THEORY The process in which green plant prepare their food in their body by using carbon dioxide and water in presence of sunlight absorbed by chlorophyll called photosynthesis. Water + Carbondioxide ➡ Glucose + Oxygen 6H2O + 6CO2 ➡ C6H12O6 +6O2↑
TO DEMONSTRATE THAT OXYGEN IS EVOLVED DURING PHOTOSYNTHESIS. Read More »
MATERIAL REQUIREDS A glass tumbler, water, postcard THEORY The force per unit area is called pressure. The pressure exerted by atmosphere is called atmospheric pressure. The atmosphere exerts pressure about 1.013 ✖ 10 5 N/m-2 or 760 mm of Hg at Sea level. Atmospheric pressure can hold about 10 m high water column. PROCEDURE OBSERVATION
TO PROVE THAT OCCURANCE OF ATMOSPHERIC PRESSURE BY TUMBLER AND POSTCARD METHOD Read More »
MATERIAL REQUIREDS Some red hibiscus flower, mortar and pestle, beaker, glass rod, distilled water, alcohol, filter paper, funnel, test tube, Bunsen burner, tripod stand with wire gauze, acid and base solution for test THEORY The chemical substance which gives H+ ion in aqueous solution are called acid for example hydrochloric acid, sulphuric acid, acetic acid
TO PREPARE ACID BASE INDICATOR FROM PLANT EXTRACT (RED HIBISCUS CHOROLLA) Read More »
MATERIAL REQUIREDS Filter paper, beaker, beaker cover, dropper, mathematical box, distilled water, alcohol, given ink mixture THEORY Chromatography is a technique that is used for separating the components of a mixture by passing it through a column or sheet of an adsorbing material. The principle of this process depends upon the fact that “the different
TO SEPARATE DIFFERENT COLOURS FROM GIVEN INK MIXTURE BY PAPER CHROMATOGRAPHY Read More »
MATERIAL REQUIRED Distillation apparatus, Coloured Water, Bunsen Burner, Tripod Stand , Stand with clamps THEORY Distillation is a process that relies on evaporation to purify water. Mixture of water or impure water is heated to form steam. Inorganic compounds and large non volatile organic molecules do not evaporate with the water and are left behind.
TO SEPARATE PURE WATER FROM COLOURED WATER BY DISTILLATION Read More »
MATERIAL REQUIRED Wolff Bottle, thistle funnel and delivery tube fitted with cork, pneumatic trough, beehive shelf, gas jar, Dilute Sulphuric acid or Hydrochloric acid THEORY Hydrogen is a reactive element and thus does not occur much in the free state. It is found in volcanic gases and natural gases in trace amount but it occurs
TO PREPARE HYDROGEN GAS IN LABORATORY Read More »
MATERIAL REQUIRED Conical flask, thistle funnel and delivery tube fitted with cork, pneumatic trough, beehive shelf, gas jar, hydrogen peroxide, manganese dioxide THEORY Oxygen is an abundantly occurring element on the earth. It constitutes about 49% in the form of various oxides of the earth’s crust. It is occurred in a free state as well
TO PREPARE OXYGEN GAS IN LABORATORY Read More »
