unLab - Grade 7

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TCodeTACtivity NameTACtivity DescriptionPacks
CM11Plant Life – PigmentsChlorophyll and other leaf pigments like anthocyanins are extracted from leaves using acetone, and then capillaried up on a piece of filter paper, which then separates the various pigments (through a natural and spontaneous process called chromatography), based on their colour, leaving you wonderful bands of colours on the filter paper to enjoy and analysePACK OF 4PACK OF 10
CC28Digestion – ProteinpH plays a significant role in digestion. While the mouth is alkaline to digest carbohydrates, the stomach is highly acidic to activate Pepsin, the enzyme that digests protein. In this TACtivity, we create an artificial stomach where we use citric acid and pepsin to help digest milk.
BA17DIY SilkEver wondered how your clothes are made, or woven, and from what fibres they are sourced? Here, we draw multiple strands from silk cocoons submerged in warm water, to create your own silk yarn. You may dye the yarn using natural colours, such as turmeric or vermilion.
CH06DIY ThermometerGenerally, matter of all forms expand and contract, on heating and cooling, respectively. This principle is used in thermometers, where the expansion of liquid mercury helps in determining the temperature. In this TACtivity, we will make and explore a non-mercury-based thermometer, using a test tube filled with propanol and a straw acting as the capillary tube.
PT12DIY SundialA sundial is a device that tells the time of day when there is sunlight, by the apparent position of the Sun in the sky. Using a beautiful template created by the University of Cape Town, we make a sundial using a piece of cardboard and a skewer. This wonderfully designed portable sundial can be used at locations all around the world as it has an adjustable dial to fix the latitude you are located at!
CO02DIY Multiple Test Tube StandSome experiments often require the use of a multiple test tube holder, useful for making comparisons and holding multiple test tubes side by side. 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. Add more slits and more test tube holders to make multiple test tubes stand next to each other.PACK OF 6
CC27Acids & Bases – Hibiscus IndicatorHibiscus or Chinese Rose is an excellent Acid / Base Indicator. Create an indicator using dried Hibiscus petals and test everyday objects for their pH. Explore other natural indicators like Red Cabbage, Rose and Onions, most of which contain a pigment known as Anthocyanin.
CC34Acids & Bases – NeutralisationAn Acid is a substance that donates protons (i.e. hydrogen ions) and a Base is a substance that accepts protons. When an acid and base react, it results in the formation of salt and water. When the reactions results in a neutral solution, this process is called neutralisation.

This TACtivity demonstrates the quantity of acid required to neutralise a particular amount of base and vice versa, indicated by the colour-changing Bromothymol Blue indicator.
CP08DIY Copper Sulphate CrystalsOne of the most classic, and also fascinating, ways to grow a crystal. The dazzling blue colour of copper sulphate makes it visually one of the most appealing crystals. A saturated solution of copper sulphate is allowed to cool in a container. Over time (several hours to days) crystals start forming at the bottom of the container. By routinely filtering out the solution and re-introducing the filtered solution to the growing crystal(s), one should be able to grow large, blue crystals of copper sulphate
BO03Blubber ModelBlubber is a thick lipid layer present under the skin of mammals that live under water and in cold regions. Here, we use two plastic covers – one filled with fat – to simulate a blubber glove.
BA05DIY StethoscopeA 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.
PM06DC Motor ModelThis amazingly simple model of a DC Motor allows you to experience various facets of electromagnetism first-hand. The simple design and materials allow you to play with, experiment and tinker with this model and discover the properties of electricity and magnetism yourself. Current from the battery flowing through the copper coil makes it an electromagnet (OerstedÂ’s Law), which in turn interacts with permanent magnets, providing a thrust for the copper coil to rotate. All electric motors in the world work on the same principle. Here you make, play with, tinker and experiment with a brilliantly simple model first-hand.
PL20DIY MicroscopeA microscope is an instrument used to observe very minute/small objects that are not visible to the naked eye. It consists of a diverging (convex/biconvex) lens, which enlarges the small objects to make it visible to the human eye.

In this TACtivity, we will make a microscope using glass beads (which act as the biconvex lens) and explore it by adjusting its focus to get a clear image and viewing some interesting objects.