Part of ChemistryChemical reactions
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A two-minute video showing you how to make bread.
WHAT YOU NEED: 500 g of flour, 2 teaspoons of salt, 1 teaspoon of sugar, 7 g of yeast, 350 ml of lukewarm water and kitchen equipment.
STEP 1 - MIX IN BOWL: Put 500 g of flour in a bowl...
...and mix in 2 teaspoons of salt, 1 teaspoon of sugar and 7 g of yeast.
STEP 2 - ADD WATER: Make a well in your dry mixture and mix in 350 ml of lukewarm water. The warm water will activate the yeast, a living fungus.
STEP 3 - KNEAD: Dust the board with extra flour and remove the mixture from the bowl. Knead the dough until it is firm and springy.
STEP 4 - YEAST RISES: Oil the bowl, put the dough in and cover it with cling film to keep it moist. Then leave it for about an hour to let the yeast do its work.
The yeast consumes glucose in the mix, producing ethanol and carbon dioxide. You may be able to smell the ethanol evaporating. The carbon dioxide gas makes tiny bubbles in the dough. The reaction releases energy - can you feel the dough getting warm?
STEP 5 - DOUGH IN TIN: Shape the dough or put it in a bread tin.
STEP 6 - OVEN FOR 30 MINUTES: Place it in the oven at 190 掳C for 30 minutes. The heat causes the gas bubbles to expand and makes the bread rise even more. Use oven gloves to take the bread out of the oven. You've done it! Enjoy a slice of delicious home-made bread.
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Introduction to chemical reactions
Oxidation
Catalysts
Exothermic and endothermic reactions