We agreed to crush bath bombs...but we also needed more evidence since our the hand lenses we used didn't really help us see close enough (i.e. if there was gas trapped inside the divots in a bath bomb. But we did worth through that if we put whole bath bombs in a container and crushed them, that maybe there'd be a way to see if there was gas being released. A hard container would be difficult to pull our thinking off. But a plastic bag could help! If the gas was released in a closed baggie, the baggie would blow up or inflate.
So we tried it.
And the bag didn't inflate.
We thought maybe it inflated a little and we couldn't see the difference, so a scale could help! We did it again and say NO change on the scale. Bummer. The gas doesn't seem to be inside.
SO where is it coming from? Is there a way to do this same thing inside a closed system? And trap what's being created? With careful guidance to NOT use a plastic bag, we used some random water bottles Mrs. Brinza has collected along with some test tubes lying around in the science lab! We found some incredible things from doing this:
1. The gas that appeared when the bath bombs and water meet made the bottle really hard.
2. The weight before and after mixing the two ingredients didn't change the bottle's weight.
3. When we opened the bottle, it made a hissing sound! Gas escaped that wasn't there before!
So we tried it.
And the bag didn't inflate.
We thought maybe it inflated a little and we couldn't see the difference, so a scale could help! We did it again and say NO change on the scale. Bummer. The gas doesn't seem to be inside.
SO where is it coming from? Is there a way to do this same thing inside a closed system? And trap what's being created? With careful guidance to NOT use a plastic bag, we used some random water bottles Mrs. Brinza has collected along with some test tubes lying around in the science lab! We found some incredible things from doing this:
1. The gas that appeared when the bath bombs and water meet made the bottle really hard.
2. The weight before and after mixing the two ingredients didn't change the bottle's weight.
3. When we opened the bottle, it made a hissing sound! Gas escaped that wasn't there before!
All this new evidence is helping us write our first scientific claim! Where is the gas coming from when the bath bomb hits the water? Has it been trapped in the bath bomb? Or is it new matter that's being created that wasn't there before? Looks like the Key Model Ideas we've been developing will help us provide reasoning alongside the evidence we've gathered. Go 6th grade!