66953_Prof CHEM INS_Cover(6L) - Imaginarium
66953_Prof CHEM INS_Cover(6L) - Imaginarium
66953_Prof CHEM INS_Cover(6L) - Imaginarium
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What happens when you mix an acid and a base?<br />
When two or more different substances (an acid and a base) are mixed, a chemical reaction occurs and a<br />
completely new substance is formed.<br />
You will only need the following material:<br />
• Vinegar<br />
• Sodium bicarbonate (baking powder)<br />
• A beaker<br />
• A cup<br />
• A dropper<br />
• A measuring cup<br />
• A measuring spoon<br />
Measure 5cc of baking powder with the measuring spoon and place it in an empty cup. Measure 30cc of water in<br />
the beaker, add the baking powder and stir well. That's it. Add 15 drops of vinegar to the beaker.<br />
Add 15 drops of baking powder solution to the beaker and stir to mix the two solutions. What happens? Add more<br />
vinegar, drop by drop, until it stops bubbling.<br />
Stir the beaker after each drop. It's time to check the pH of the solution. Take note of the result in the chart.<br />
The bubbling stops once the chemical reaction is complete. Choose one or more substances - an acid and a<br />
base - and repeat the experiment.<br />
Building a self-propelled speedboat<br />
Prepare the following material:<br />
• Sodium bicarbonate (baking powder)<br />
• Vinegar<br />
• A plastic bottle<br />
• Paper tissue<br />
• A plastic straw<br />
• Plasticine<br />
• Scissors<br />
• A measuring cup<br />
Make a small hole on the bottom of the bottle, close to the edge (use scissors).<br />
Insert the plastic straw through the hole until only 1cm sticks out. Fix it with<br />
plasticine and then pour a whole measuring cup of sodium bicarbonate into a<br />
paper tissue. Wrap the powder inside the tissue as if it were a sweet. Pour a<br />
whole measuring cup of vinegar into the bottle, place the paper tissue inside and<br />
screw the top on as quickly as possible.<br />
To finish, place the bottle in a bucket full of water. What happens? The vinegar<br />
reacts with the sodium bicarbonate to produce gas which escapes through the<br />
straw and propels the speedboat.<br />
Make a volcano<br />
Make a volcano with lava pouring out, using:<br />
• Plasticine<br />
• Red food colouring<br />
• Vinegar<br />
• Sodium bicarbonate (baking powder)<br />
• A measuring spoon<br />
• A dropper<br />
• A large plate<br />
First, mould the plasticine in the shape of a volcano and place it on the<br />
plate. Make a crater by pressing with your thumb.<br />
Use the measuring cup to place a large amount of sodium bicarbonate<br />
inside the volcano. Using the dropper, put two drops of red food colouring<br />
on the sodium bicarbonate: add 4 drops of vinegar and... What happens?<br />
A chemical reaction has made 'red lava' pour out of the volcano.<br />
Sodium Hydrogen<br />
Carbonate<br />
10g<br />
NaHCO3<br />
CAS# 144-55-8<br />
P37-08350-60120000<br />
vinegar<br />
17
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