On Friday the 17th of January Rosanne from Lismore Science came over to give us a talk about the digestive system and chemistry. She first did the digestive system. First she put rice crispies in a bowl and we mashed them up with a spoon. After that she put in water which acted like saliva. Once it is all crunched up the food goes down the esophagus and into your stomach and stomach acid digests it. After digesting for 4 hrs it moves on and goes past your liver which produces bile. Bile takes the gastric acid out. It then goes into your small intestine which takes the minerals and vitamins in, then goes into your large intestine where it is waste. We then moved onto chemistry. We were learning about acids and bases. We used cabbage juice as an indicator. If a liquid turns red or pink when you put in the cabbage juice it is an acid. If it turns blue or green it is a base. She then showed us a Ph scale from 0 to 14. If it is a 7 it is neutral like water which is not an acid or a base. She put out liquids and we had to test them with the red cabbage juice. After that we made a chemical reaction by putting in vinegar and bread soda. We then did the same thing but this time we caught the gas. We put a glove over a cup and poured in the same thing and the glove blew up. It was a very interesting day and I enjoyed it. By Aaron 5th class.
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