Sunday, August 11, 2019

Science box - Sweet and Sour

We explored acid and base chemistry.

We learned that there is a scale to measure if something is acidic or basic, called a PH indicator.
Very acidic foods are close to 14 on the scale and very alkaline, or basic foods are near 0.

We made sherbet.

First we had to carefully measure amounts into our paper bag.
A teaspoon of icing sugar, 1/2 a teaspoon of citric acid, 1/2 a teaspoon of Raro flavour, and 1/4 of a teaspoon of baking soda.



We mixed them together then tasted our sherbet.


 It fizzed on our tongues and tasted sour!

I'm not sure if I like it!

I like it!


Making an Indicator

We made our own colour changing liquid called an indicator, using red cabbage. 

We set up our test tube racks.

Add caption
We tore red cabbage leaves into tiny pieces.
 We put the cabbage pieces into a plastic bag and added hot water.


We massaged the bag until the water turned purple.
Then we poured the liquid into our test tubes.

 When we dipped our PH paper into the liquid we checked the colour it turned against our PH scale.
It was green. Green is 7 on the scale, which makes it a neutral substance. This is why it is an indicator. When you put something acid or basic into the liquid it will change colour again.

We dropped some vinegar into one test tube.


We got different colours from different things.

Baking soda is basic, it turns the indicator pink.
Vinegar is acidic. it turns the indicator blue.

Wheat heads - Mr Green multiplies

This is how you make a wheat head person:
Put some wheat seeds in the end of a stocking and stuff with sphagnum moss to make a round head shape.
Tie a knot and glue a face on. You can use pipe cleaners, pompoms, anything to make the face features.
Soak in water.
Sit your head in a container of water so the moss can draw up the water and moisten the wheat.
Watch the wheat sprout and turn into a hairy headed person!

here is Mr Green Bean. He has an impressive hairdo!
And here are his class of little wheat head people.
Hair starting to sprout after a week.

Magenta started her head a week after the others. See the difference in hair growth.

Pretty hairy wheat head people!

Hair is sprouting on Arya, Chloe and Cooper's wheat head people

Four days later ..... Chloe's was a bit dry so slower to sprout.

Early days.

Five days later.