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|TCode||TACtivity Name||TACtivity Description||Packs|
|CC22||Reaction – Ammonia Gas||Smell is one of the most intense of senses. It is one closely|
associated with memories of place and time. It plays strongly on our emotions. Its also natures way of warning us about what to avoid and what we are attracted to. Here, we create one of the most pungent smells around, and realise the power of chemical changes. This is also a remarkable reaction because it absorbs huge amounts of heat and is a classic endothermic reaction.
|PACK OF 4||PACK OF 10|
|BE05||Explore Binocular Vision||Ever wondered how we develop a perception of depth through our childhood, how 3D glasses work or what stereoscopic vision is? Well, here is a wonderfully simple TACtivity to demonstrate binocular vision! In pairs, play the following game: throw a tennis ball at your friend from a distance of 2-3 metres and have her/him catch the ball. Now do the same by asking your friend to do the same by closing an eye (you may use a blindfold/eye-patch for 1 eye instead of winking). What is easier: catching with both eyes open or is one enough? Now repeat the same game by changing roles|
|PM15||DIY Battery Holder||Regular electrical cells available in the market are typically 1.5V. However, several appliances need a larger voltage to work. Even LEDs need a minimum of 1.9V to light up. This requires connecting 2 or more cells in series. To do this in a robust manner, one needs battery holders.
In this TACtivity, you make your own 2-cell battery holder using a foam piece, some metal strips and electrical wire.
|PL01||Light – Colour Arithmetic||We are often told that light is made up of many colours, that white light is a mixture of all colours, etc. But when many colours are mixed together, do you always get closer and closer to white? Have you tried mixing multiple colours using paint / sketch pens / pigments? What difference do you notice?
In this eye-opening dual TACtivity, we “add” and “subtract” colours, using LEDs and sketch pen colours respectively, and see that coloured pigments and coloured light mix differently.
|BA05||DIY Stethoscope||A stethoscope is a medical instrument to listen to a patient’s heartbeat or breathing, and typically has a small disc-shaped resonator that is placed against the chest, and two tubes connected to earpieces. Here, we insert pipes in a cut ball and insert binding wire to the pipes to give them the shape of a stethoscope. Foam pieces are fixed at the other end of the rubber pipes to make the ear plugs.|
|CO01||DIY Test Tube Stand||Some experiments often require the use of a test tube holder and/or stand. Here we make a test tube holder by making a loop using binding wire to hold the test tube and by wrapping the binding wire around an ice cream stick or any other object made from a poor conductor of heat. Make a slit in a foam base and insert the ice cream stick inside it to extend the test tube holder to a test tube stand.||PACK OF 6|
|CP02||DIY Lip Balm||Substances can be mixed, without reacting chemically, to form another substance with different physical characteristics. This is often called a physical change. In this TACtivity, using purely natural materials, such as beeswax, edible oils and a fragrant essential oil, we create a lovely-smelling lip balm that should soothe your chapped lips.|
|PT04||Motion – Curvilinear||We see all kinds of motion and movement in our daily life: trains going straight, autos taking a U-turn, merry-go-rounds going …. well! In this riveting TACtivity, thin binding wire is wound around a pencil to make a wonderful “spiral”, in which small straw pieces are inserted to create wonderful curvilinear motion. Can you decipher the snake??|
|CC16||Digestion – Starch||The process of digestion begins in our mouth when we chew our food to reduce them to smaller food particles. The amylase enzyme present in our saliva helps in breaking down complex carbohydrates – such as starch present in wheat, potatoes, corn, rice and other grains – into simple sugars. Our body utilises these simple sugars to obtain the energy needed to do our daily activities.
In this TACtivity, we will perform a test to demonstrate the breakdown of starch by the amylase enzyme.
|BP16||Plant Life – Germination||Germination is the process of a seed developing into a new plant and depends on the amount of water, air, temperature and sunlight supplied to it. Water plays an important role for seeds to germinate.
In this TACtivity, we compare the germination rate of different seeds when fully submerged in water, partially submerged in water and exposed to air without water.
|CP29||Density – Shrink & Sink||The density of an object is nothing but the ratio of its mass to its volume. In a fluid, objects that are less dense than the fluid will float, whereas those denser than the fluid will sink. In this TACtivity, a balloon is partially inflated and a nut is suspended from it with a thread such that the whole assembly floats in water. This is then inserted into a plastic bottle filled to the brim with water and closed tightly shut. When you squeeze the bottle, the balloon should start to sink! How and why?|
|CP28||Density – Saline Water||The density of a liquid can be changed quite easily and dramatically by dissolving a soluble solute in the liquid. We observe this property by seeing if a lemon floats or sinks in freshwater and a saline solution.|
|CP24||Density – Mushroom Clouds||Diffusion is the tendency of two substances to mix with each other. In this TACtivity, notice how the speed of diffusion depends upon the density difference between the liquids, which leads to “mushroom clouds”. Here, we use just water, potassium permanganate crystals and sugar to conduct a series of experiments on solutions of different densities.|