Welcome to our lab 13 blog for this week.
We are going to tell you about the events of our trip to Wren Academy Science Bus! When we arrived we met and talked to Sam, who is the person in charge of the Science Bus. Sam took us to the bus and told us the rules, and there would be no fires as we were not using anything dangerous: but if there was we knew where to go!
We went upstairs in the bus and were told the first experiment we were going to do was to make jelly worms! First we mixed calcium powder with water, and waited for that to dissolve after we mixed it. Then we got a syringe and sucked up 10ml of alginate: which is green runny jelly stuff. Next we slowly squirted the alginate into the glass beaker of calcium solution, where it turned into solid jelly. We used a sieve to get the jelly out of the glass and put it in another glass and it ended up with jelly worms. We tried to get the longest worms we could: Isabella made one over 60 cm long!
Our next experiment was using daphnia (water fleas). We caught them using a squeezy bottle, and put them on a microscope slide with a tiny bowl in it. Then using a microscope, we tried to see their heart beat. It was really hard to catch them, as they were so tiny! Some of us counted their heart rate, it was about 150 times a minute.
Next up was nappy snow. To find this, you dissect a nappy by cutting the padding in the middle inside the nappy. Underneath that, there is cotton wool, and slowly lift it up. Then, feel around for grains of gritty stuff, which looks like sugar: this is your nappy snow! Finally, collect the powder into a jar then spray some water into the jar: the powder will get much bigger and softer and look just like snow!
Finally we did a brief experiment to find out which sun cream works best, we used a UV light instead of the sun to do this, and special beads which change colour in UV light instead of our skin. We discovered that Factor 50 oil protected the beads the best.
It was really fun because it wasn’t at all like a normal science lesson: it was so cool doing experiment on a bus! We’re really looking forward to going back soon, hopefully the committee can visit every term!
If you would like to organise a trip to the Wrenn Science Bus with your school, email Sam Mallett at Sam.Mallett@wrennschool.org.uk.
By Noah and Aiden