Science Week 2020 - Ms Dermodys 4th class

Post date: Nov 20, 2020 3:42:16 PM

This week, we carried out some fun experiments for science week. 

First, we made a gas by creating a chemical reaction between vinegar and bread soda. To prove that a gas was produced, we attached a balloon to the top of the bottle. The balloon inflated so it was clear that a gas was produced. 

Next we investigated how exercise increased our heart rate. We checked our pulse when we were sitting down to get our resting heart rate in beats per minute (bpm). Then we did some strenuous exercise for 10-15 minutes. When we checked our heart rates again, they had increased a lot. We learned that this happens because our muscles need more oxygen when we are exercising and blood carries this oxygen to the muscles. Therefore, the heart needs to beat faster and work harder. 

Finally, we made ‘lava lamps’ using oil, water, food colouring and fizzing tablets. We learned that oil is less dense than water because it floated on top of the water. We also learned that the gas produced by the fizzing tablet is less dense than both oil and water because it rose to the top, carrying a colourful droplet of water with it. When the gas escaped at the top of the bottle, the colourful droplet sank back down to the bottom of the bottle because water is the least dense of them all.