Today's science club was all about gathering and using evidence to identify 3 mystery powders.
We started by looking at the powders and guessing what each one was. Then we decided we needed some more evidence because we still weren't sure what they were. Finally we decided to taste them - Jennie said they were all edible.
Tasting gave us our final piece of evidence!
Substance A looked white, fine and grainy,didn't have much of a smell, tasted yuck and fizzed on our tongues.
Substance B looked like salt or sugar, didn't have much of a smell and tasted quite sour
Substance C looked like flour but tasted sweet.
What do you think out 3 substances were and what did we make when we mixed all 3 together?
It's National Science Week this week and the theme is Light!
This theme was chosen because it is the International Year of Light.
Who knows what our main source of light is? Is it electricity? Is it something else?
Light comes in many different forms - there is white light - which is the visible light we can see, but there are also other types of light - one of these is UV light. UV is the light that causes sunburn but you can't see the it.
Did you know that you can get sunburnt even when it is cloudy? You can also get sunburnt in the winter - especially if you are up at a skifield!
Have a look at this video:
It says that UV can't go through glass or sunscreen. What about clouds? I wonder if there is UV light when it is dark? Where does UV light come from?
How could you test these questions out? What evidence can you find to help back up your thinking? It's like when the police send someone to court - they have to have evidence that shows what they did wrong - scientists have to have evidence that supports what they think.
We have some UV beads at school - they are special beads that can tell you when you are exposed to UV light. How could you use these UV beads to find some evidence to answer these questions?
Take photos of you finding out the answers and email them to Jennie L and she will put them on a blogpost. Comment on this post with your evidence - what did you find out?
