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Atal Tinkering Labs ATL

25 Nov
0

Sonometer

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The sonometer itself consists of a wire stretched between two supports or bridges on a wooden sounding box. The tension of the string may be varied either by a screw or by hanging weights on one end of it. The length of the vibrating wire can be changed using a small wooden support that can be moved along under the wire.   The purpose of the sounding box is to make a larger mass of air vibrate and so amplify the very small sounds produced by the vibrating string itself. If a string which is stretched between two fixed points…

25 Nov
0

Chemical Tests for Chloride

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Chlorides are salts of chlorine gas containing chloride ion. Chloride ion is formed when the element chlorine gains an electron. The most commonly known chloride salt is sodium chloride which is used to preserve food. Another important example of chloride is calcium chloride, used as a desiccant in laboratory desiccators to maintain a dry environment.   This video explains how to test the presence of chloride ion in a given salt.  

25 Nov
9

Preparation of Lassaigne’s Extract

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In order to detect the elements in organic compounds, they have to be converted into their ionic forms. This is done by fusing the organic compound with sodium metal. The ionic compounds formed during the fusion are extracted in aqueous solution and can be detected by simple chemical tests. The extract is called sodium fusion extract or Lassaigne’s extract.   This video explains how to prepare Lassaigne’s extract of the given organic compound.  

25 Nov
3

Heating of Copper Sulphate

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Copper sulphate pentahydrate contain 5 moles of water per one mole of copper (II) sulphate. Its formula is written as CuSO4.5H2O and has blue colour due to water of hydration. It can be converted into anhydrous copper sulphate when heated strongly. When heated, it loses two water molecules at ~63°C followed by two more at ~109°C and the final water molecule at ~200°C and turns to white coloured anhydrous copper sulphate. This above process can be reversed. When water is added to white coloured anhydrous copper sulphate, its colour changes to blue, indicating that the blue coloured copper sulphate pentahydrate…

25 Nov
0

Detection of Albumin in Urine

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Albumin is normally found in the blood and filtered by the kidneys. When the kidneys work normal, there may be a very small amount of albumin in the urine. But when the kidneys are damaged, abnormal amounts of albumin leak into the urine. This is called albuminuria.   This video explains how to detect the presence of albumin in urine.  

25 Nov
0

Separation of Pigments from the Extract of Spinach Leaves by Paper Chromatography

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Paper chromatography is an analytical method, used to separate coloured substances, especially pigments. In paper chromatography, the sample is distributed between a stationary phase and a mobile phase. The stationary phase is usually a piece of high quality filter paper. The mobile phase is a developing solution that travels up the stationary phase, carrying the samples with it. When mobile phase is moved over the sample on the stationary phase, the components of the sample gets gradually separated from one another.   This video explains how to separate the pigments from the extract of spinach leaves by paper chromatography.  

25 Nov
0

Fractional Distillation

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Fractional distillation is used for the separation of a mixture of two or more miscible liquids for which the difference in boiling points is less than 25 K. The apparatus for fractional distillation is similar to that of simple distillation, except that a fractionating column is fitted in between the distillation flask and the condenser.   This video explains how to separate a mixture of ethanol and water by fractional distillation.  

25 Nov
0

Young’s Modulus

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Young’s modulus, also known as the elastic modulus, is a measure of the stiffness of a solid material. It is a mechanical property of linear elastic solid materials. It defines the relationship between stress (force per unit area) and strain (proportional deformation) in a material. Young’s modulus is named after the 19th-century British scientist Thomas Young. A solid material will deform when a load is applied to it. If it returns to its original shape after the load is removed, this is called elastic deformation. In the range where the ratio between load and deformation remains constant, the stress-strain curve…

25 Nov
14

Purification of Copper Sulphate by Crystallization

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Crude copper sulfate is a mixture of copper sulfate with various impurities that may include copper carbonate, copper oxides, and other copper compounds. To crystallise copper sulphate, dissolve it in water and add a small quantity of dilute sulphuric acid to prevent the hydrolysis of copper sulphte. The impurities left behind in the solution are removed by filtration. The filtrate is concentrated to the crystallisation point and then cooled. On cooling, transparent blue crystals of copper sulphate separate. The copper sulphate crystal formed has triclinic shape.   This video explains how to prepare the crystals of pure copper sulphate form…

25 Nov
0

Characteristics of Dicot and Monocot Stem and Root

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Dicot stems have a circular arrangement of vascular tissues, whereas the stems of monocots have vascular-tissue bundles scattered throughout. In monocots the vascular bundles also tend to be toward the outside of the stem. Dicot vascular tissue forms a cylinder near the center of the stem. Monocot roots, interestingly, have their vascular bundles arranged in a ring. Dicot roots have their xylem in the center of the root and phloem outside the xylem. A carrot is an example of a dicot root.   This video explains how to prepare temporary stained glycerine mounts of transverse sections of the stem and…

25 Nov
0

Friction

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When one body makes an attempt to slide over another body, an opposing force called the force of friction arises as a reaction to the applied force, and acts in the opposite direction. Static friction is the type of friction that exists when two objects touch each other at rest. It has a limiting value called limiting friction, which is equal to the least force required to move the body from rest. When the external force F is increased, a stage comes when the body is just at the verge of moving. At this stage, the force of friction is…

25 Nov
0

Monocot and Dicot Plants

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Flowering plants, also known as Angiosperms, are the most diverse group of land plants in the world, with at least 2,60,000 living species classified into 453 families. The flowering plants were divided onto eight major groups, the largest number of species belonging to monocots and dicots. Monocot and dicot plants have specific characteristics. We identify plants by looking at their external characteristics such as seeds, roots, leaves, flowers, pollen, stems and vascular bundles. Based on the differences, they are placed in one of these two groups.   This video explains how to study the external features of Monocot and Dicot…

25 Nov
0

Demonstration of Stomata on a Leaf Peel

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Stoma is a pore found in the epidermis of leaves, stems and all other plant parts found above the ground. Stomata are thus named because they permit the exchange of gases between the atmosphere and the inside of the leaf. Stomata are found on either both sides or on just one side of the leaf. The distribution of stomata varies in different plants. There are more stomata on plant surfaces in conditions like lower atmospheric carbon dioxide concentrations, moist environments and higher light. In dicot plants the number of stomata is greater on the lower surface than on the upper…

25 Nov
0

Parallelogram Law of Vectors

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If two vectors acting simultaneously on a particle are represented in magnitude and direction by the two adjacent sides of a parallelogram drawn from a point, then their resultant is completely represented in magnitude and direction by the diagonal of that parallelogram drawn from that point.   This video explains how to find the weight of a given body using the Parallelogram Law of Vectors.  

25 Nov
1

Study of Stomatal Distribution on Leaves

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Stomata are minute pores found on the epidermis of leaves and young shoots of plants that are used to control exchange of gases. The pore is surrounded by a pair of specialised cells called the guard cells that are responsible in regulating the size of the opening. Distribution of stomata varies between monocots and dicots, between plant species, and between the underside and top side of the leaves on a plant. Stomata are found more on plant surfaces thriving under higher light, lower atmospheric carbon dioxide concentrations and in moist environments. Usually the lower surface of a dicot leaf has…

25 Nov
0

Screw Gauge

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The screw gauge is an instrument used for measuring accurately the diameter of a thin wire or the thickness of a sheet of metal. It consists of a U-shaped frame fitted with a screwed spindle which is attached to a thimble. The pitch of the screw is the distance moved by the spindle per revolution. To find this, the distance advanced by the head scale over the pitch scale for a definite number of complete rotation of the screw is determined.   This video explains how to find the volume of a wire and an irregular lamina along with the…

25 Nov
0

Metre bridge-Resistance of a wire

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The metre bridge is operates under Wheatstone’s principle. Here, four resistors P, Q, R, and S are connected to form the network ABCD. The terminals A and C are connected to a battery, and the terminals C and D are connected to a galvanometer through keys K1 and K2 respectively. In the balancing condition, there is no deflection on the galvanometer. Then, P/Q = R/S.   This video explains how to find the resistance of a given wire using a metre bridge and hence determine the specific resistance of its materials.  

25 Nov
0

Determination of Concentration of KMnO4 Solution Using Oxalic Acid

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The oxidation and reduction reactions in aqueous solutions involve the transfer of electrons from one species to another. In the oxidation of a substance electron(s) is (are) transferred from the species and in reduction, electron(s) is (are) gained by the species. Oxidation and reduction reactions occur simultaneously. A reaction, which involves simultaneous oxidation and reduction, is called a redox reaction. The titrations involving redox reaction are called redox titrations. In Redox titrations involving potassium permanganate, it acts as a powerful oxidising agent.   This video explains how to determine the strength of potassium permanganate solution by titrating it against a…

25 Nov
3

Asexual Reproduction in Amoeba and Yeast

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The type of reproduction that takes place without the process of gamete (sex cell) formation is called asexual reproduction. Asexual reproduction is the primary form of reproduction for single-celled organisms such as the archaea, bacteria, and protists. Many plants and fungi reproduce asexually as well. Asexual reproduction is a mode of reproduction by which offspring arise from a single parent, and inherit the genes of that parent only. The offspring will be the exact genetic copies of the parent. Binary fission and budding are two common method of asexual reproduction. Binary fission is found in unicellular organisms like Amoeba, Paramaecium…

25 Nov
1

Onion and Cheek Cells

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The cell is possibly the most important concept in biology since it is the basic unit of life. Every living organism is made up of cells (or just one in the case of bacteria). All the animals, trees and plants are made up of cells that share many similar characteristics.   An onion is a multicellular (consisting of many cells) plant organism.As in all plant cells, the cell of an onion peel consists of a cell wall, cell membrane, cytoplasm, nucleus and a large vacuole. The presence of a cell wall and a large vacuole are indicators that help identify…

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