Science

 YEAST

What Is Yeast? Yeast is fungy found in the air around us, its been around for a long long time/ years, There is yeast that is man made in a bottle, Over a thousand kinds of yeast, in bread there is co2 because the yeast eats the sugar and releases gas, 

What is Fermentation? the chemical breakdown of a substance by bacteria, yeasts, or other microorganisms, typically involving effervescence and the giving off of heat.

What effect does sugar have on yeast Too little sugar in dough can slow down yeast activity: Yeast is a lot like us – it loves to eat sugar. Yeast needs sugar to produce carbon dioxide – the leavening gas that causes the dough to rise. If there is not enough sugar available, the dough will rise slowly or not at all.

What are three foods that have yeast 

1. Ginger Beer 

2. Bread

3. Cake

 

Equipment: 

. Spoons

. Kettle 

. Bowl

. Beaker

. Cloth sieve 

. Funnel

. Plastic (pet) bottle and cap 

Materials:

. 50ml warm water.

. 1/2 tsp active dried yeast.

. 1/2 tsp sugar.

. 1/2 tsp ground ginger. 

Ginger Beer. ( For 1 Liter)

3/4 cup sugar 

1/2 tsp cream of tartar 

. 1L cold water 

. Juce of 1/2 lemon 

. 1 tsp ginger beer bug 

Method

1. Ina large bowl, put the 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 bug to the large bowl of cold water.

4. Stir well and then pour into your clean bottle. 

5. Lable your bottle with your group names. 

6. Place all the bottles in the class counter.

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.