An interesting and memorable way of demonstrating digestion for Year 11 Human Biology. Tuna sandwich made from one piece of bread and spread. Length plastic tubing about 3.5cm x 20cm for the oesophagus Medium plastic bag for the stomach. Tubing about 7 to 10 cm in diameter, fashioned from a plastic bag, cut and taped…
Experiments
Density layers/floating demonstrations:
1. Gas jar with layers set up as follows: Pink tinted meths as the top layer Paraffin Oil Green coloured water Honey at the base Then, gently drop in a marble which will sink to the bottom. Followed by a 10c coin which sits on top of the honey. Then a piece of Perspex (cut…
Crystal growing:
Salt (sodium chloride or table salt) produces big crystals and you can colour them to make them easier to see. Try phenyl salicylate also known as Salol. This solid melts at 41 to 43 degrees C so if some is placed in a test tube and then placed in hot water it becomes a liquid.…
Convection Currents:
There are some good ideas for demonstration, on these websites: http://www.stevespanglerscience.com/experiment/00000031 This is the link to the ABC’s Surfing Scientist, great demos, etc with easy set ups. Good ideas for end of year pracs. http://www.abc.net.au/science/surfingscientist/
Coke and Mentos:
Use Home Brand diet cola, warmed, and original Mentos that have been kept in the fridge overnight. Professor Bunsen also offer a great delivery system available for purchase but you can make your own.
Chlorine and Bromine water production:
Both of the following procedures MUST BE CARRIED OUT IN A FUME HOOD CHLORINE WATER Measure out 40ml of household bleach (do not use the expensive variety of bleach that has been thickened) Add 40mL of 1M sulfuric acid and then dilute with water to 100mL BROMINE WATER Take the prepared chlorine water and add…
Bouncy Balls Recipes:
Products from all 3 recipes don’t last very long, so store the balls in a small zip-lock bag between uses. Recipe 1 (our favourite): 3 teaspoons water glass (sodium silicate). The cheapest place to buy is from pottery supply warehouses 1 teaspoon alcohol. Use alcohol based hand sanitiser as it smells less but isopropyl alcohol…
Blood model:
Ingredients: 500g glace cherries cut in half. 1 litre bottle of water uncooked rice grains 4 or 5 flat oval yellow and white lollies or similar. Clear bowl. Method: Teacher concocts the model while giving a lesson on the components of blood. Cherries are red blood cells. Water: plasma (asks How many 1 litre bottles…
Bath Bombs:
Materials: 4 tablespoons (35 g) Bicarbonate Soda 1 tablespoon (8g) Citric Acid 2 teaspoons Sweet Almond oil 2 drops food colouring 2 drops Essential oil Pop stick Plastic cup Tea strainer Water spray Method: Sieve bicarbonate soda and citric acid together into a plastic cup Add 2 teaspoon of sweet almond oil, 2 drops of…
Angry Bottles:
Basic Recipe: 8g potassium hydroxide dissolved in 300mL water. Add 10g glucose. For blue to clear: When dissolved, add 2 to3 squirts methylene blue. For blue to pink: Also add 2 to 3 squirts phenolphthalein. For blue to yellow/green: Also add lots of fluorescein. Pour into a 1 litre volumetric flask or a jar and…