Materials Large beaker 150ml graduated cylinder 50ml cups of vinegar 2 tsp baking soda 50ml water 8-10 sticks of broken spaghetti. Food colouring Procedure Fill the beaker with water Measure and pour 100 ml of vinegar into the beaker. add the food colouring - if needed Add two tablespoons of baking soda to the water and mix thoroughly. Put eight to ten pieces of broken spaghetti in the beaker and wait until the spaghetti settles to the bottom. A chemical reaction will take place, causing the spaghetti to move in the beaker. Repeat experiment with different ratios of water, vinegar, and baking soda. Whats happening The noodles will bob up and down for several minutes. This noodle “dance” is captivating to watch. Since the surface of the noodles is rough, tiny bubbles of carbon dioxide gas are attracted to it. These bubbles increase the volume of the noodle substantially, but contribute very little to its mass. As a result, the...
Box example Explosion Boxes If you love pop-ups – those playful, joyful constructions that bring books and cards to life – then you will enjoy making “ explosion boxes .” These popular 3D paper crafts take pop-ups to a whole new world. Like pop-ups, “explosion boxes” offer an engaging way to invite students into the world of math and engineering. They encourage students to explore and work with measurement, parallel and perpendicular lines, angles, triangles, symmetry, and transformational geometry, all in the context of engaging students to design and make themselves. Although the deepest learning comes when students design from scratch, The simple explosion box shown here is designed to enclose a small Valentine’s Day treat, gift, or note. It can be printed first and then cut, or cut without printing from coloured card stock or plain white paper that students decorate themselves. Box Example ...
Aim: The Aim of the experiment is to see if the colour effects the burning rate of a candle Equipment: 4 different colours of candles ( the same length and make), putty or blue/white-tac, Matches, ruler, scissors, black marker, Matches, Notebook, plate to place the candles on, stop watch Method 1. Create a table that will record the colour of the candle and the time taken to for the wick to burn to the black marker. 2. Using your scissors, cut the wicks of each candle so that they are identical in length. Use your ruler to verify that every candle wick is of equal length. 3. Use your ruler to measure one inch down from the top of the candle. Next use your marker and draw a line. You should now have 4 candles with equal wicks and all with lines one inch from the top. 4. Place some white-tac on the plate. You'll be using this surface to hold your candles still, so make sure it's thick and can support the candle. 5. Gently push each candle into the clay...
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