A great week of fun with more kitchen science. It all starts off with bubbles. Giant bubbles. We also had to find out what happened to the egg that we soaked in vinegar. Next the magic of picking up a lump of ice with a piece of string. Next volcano explosions - this one is a favourite - and finally we found out that plants suck up water in their cells. Lot's of excitement and lots of learning.
We started the week by looking at the egg that we had been soaking in vinegar. The first time we tried this, Tiny was a little over excited and the egg broke in his hands. He was very surprised to find that the vinegar had dissolved the shell and left the membrane of the egg in tact. Well it was intact for a minute or so.
We wanted to try it again so we put another egg into the vinegar and left it for two days this time.
We watched and waited as the bubbles seemed to come from the shell itself.
Soon it was time to take the egg out of the glass to see what had happened to it.
Well, this time we were more successful with our testing. So successful in fact, that Tiny found the egg to be very squashy and bouncy and he was not able to break it with a spoon not matter how hard he tried. Eventually he took a fork to in and managed to break it open.
It seems the longer you leave the egg in soak the better. Definitely one to try at home.
But, back to the bubbles.
We tried out 3 mixtures to see which one would produce the biggest bubbles. And they all worked very well. I did find that the cheaper washing up liquid worked and lot better than the leading brand names, and that's a bonus. I will be making science sheets to print out for all three, but the one I liked the best was this one.
3 cups of distilled water
1/2 cup washing up liquid
1/2 cup of cornflour
1 tbsp of baking powder
1/2 cup golden syrup.
Strange mixture I know, but it worked.
On Tuesday we went to the zoo. Not Kitchen Science I know, but we did categorize the animals we looked at into prey and predator.
We performed a magic trick and picked up a piece of ice with just a piece of string. This was great fun and it allowed Tiny to be a magician in front of the other members of the household.
Fill a small bowl to the top with water.
Get yourself a piece of string around 20 centimetres long.
Next put an ice cube in the water and watch it float. (You can talk about why it floats, and at a later time you can look at images of icebergs and relate it back to this test.)
Lay the string across the ice cube and bowl.
Cover ice cube and string with a small amount of salt.
Leave for one minute.
Carefully pick up the ends of the string and the ice should come up with it.
The science behind it.
Salt lowers the freezing point of water to below 0 degrees Celsius. When you added salt to the ice cube, the salt lowered the melting point of the ice. The salt is in a thin layer, so it melts a thin layer on top of the ice cube. The water cooled down further and re-froze around the string.
We made some more moon sand today because he used up the last of our stock of it conducting his own experiments early in the week.
For his own experiment he wanted to find out what would happen if he mixed moon sand, paint vinegar and I think he added some water. He said he was being a scientist. A great excuse for some free sensory play and getting messy.
But back to the moon sand.
This is a really easy one and it last for a few weeks in zip lock bags.
All you need is
8 cups of flour
1 cup of baby oil
Nice moldable moon-sand that is just great fun to play with.
You can add powder paint to the mix to colour it up but Tiny is quite happy with it as it is.
On Wednesday we put some celery stick into coloured water to find out it plant really do suck up the water.
Today we cut them and had a look inside. Yes, plants do suck up water.
Here is the science behind it.
(Most of the time, plants get their water from the ground. This means it has to transport the water from its roots up and throughout the rest of the plant. How does it do this? Water moves through the plant by means of capillary action. Capillary action occurs when the forces binding a liquid together (cohesion and surface tension) and the forces attracting that bound liquid to another surface (adhesion) are greater than the force of gravity. Through these binding and surface forces, the plant's stem basically sucks up water—almost like drinking through a straw!)
This was a great fortnight of science fun. There are still so many more test we want to try out, but they will have to been done later.
Each time we do a test at home I will make a science sheet so that you can try them out at home.
There are some already for you to try on the kids zone - science page. pop along there to find them.
Remember while your learning HAVE FUN