Science - Yeast Alive Film

 Today in science we are doing Yeast Alive Film. On Thursday we are making ginger beer. Yeast is alive in a hibernation state. Yeast is a fungi. The experiment we are doing is with a bottle, yeast and a balloon. We have to get into groups of three.

Experiment:
Here is the yeast experiment with a bottle, yeast and a balloon. The experiment is done in 3 bottles. Let's see what happens after 20 minutes.

Aim:
To look at how yeast is used in foods.

Research:
What effect does sugar have on yeast?
- The chemical reaction between yeast and sugar produces ethanol and carbon dioxide.

What is fermentation?
- A simple way of an expansion of fermentation is that it is a chemical reaction. 

What are 3 foods/drinks that have yeast?
1. Bread
2. Ginger beer
3. Crackers 

Equipment:
- Spoons
- Kettle
- Bowl
- Beaker
- Cloth sieve
- Funnel
- Plastic Bottle

Materials:

Bug (groups of 3)

- 50ml
- 1/2 tsp to active dried yeast
- 1/2 tsp sugar
- 1/2 tsp ground ginger

Ginger beer (for 1 litre)

- 3/4 cup sugar
- 1/2 tsp cream of tartar
- 1L cold water
- Juice of 1/2 lemon
- 1 tsp ginger beer bug.

 Method:

1. Ina large bowl, put sugar and cream of tartar, then add the warm water.
2. Stir to dissolve the sugar before adding the cold water.
3. Add the ginger beer bag to the large bowl of cold water.
4. Stir well and then pour into your clean bottle.
5. Label your bottle with your group names.
6. Place all the bottles in the class container.
7. Store in a cool, dark place for one week before drinking.
8. Make sure you open the bottle in the kitchen sink as it might overflow. Open the cap bit by bit to allow the air to escape. 

The ginger beer must be dunk over the 6 days.

You must provide your own bottle.

We wanted to see how yeast was best activated. To do this we used 3 conical flasks, a teaspoon of yeast in each one, some warm water in each one and some sugar in one flask. We then put a balloon on the top of each flask. We found out that the flask that had the yeast and sugar inflated the balloon. It showed that when yeast has sugar it activates and creates a case called carbon dioxide gas.