Yeast Experiment Homework Answers

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A chemical reactionoccurs when substances are mixed together and are changed. Sometimes substances mix together and not much happens, at other times the results are pretty dramatic. Today we will look at a turbo charged chemical reaction. We will mix two substances together and add a catalyst, something to make the reaction happen faster.

What You Need:

  • Plastic Soda Bottle
  • Hydrogen Peroxcide
  • Measuring Cup
  • Dish Soap
  • Food Coloring
  • Dry Yeast
  • Hot Water
  • Funnel

Pour a cup of hydrogen peroxide in the liter soda bottle. Add a few drops of food coloring and a few drops of dish soap. In a separate bowl mix 1 teaspoon of yeast with two tablespoons of hot (not boiling – just use hot water from the faucet) water. Use the funnel to pour the yeast mixture into the mottle. Stand back!!

  • HINT: Do this one OUTSIDE!
  • HINT #2 If you want your geyser to spew more, use a plastic soda bottle that is smaller than a liter – a bottle that is smaller will have more foam shoot out of it.

Hydrogen peroxide has a lot of bubbles in it. If you let it sit long enough it will go “flat” – just like soda if you let it sit, the bubbles pop and eventually no carbination is left. When you add the yeast to the hydrogen peroxide the yeast makes this “going flat” happen super fast. The yeast breaks the hydrogen peroxide down into oxygen and water – a chemical reaction. The oxygen combines with the dish soap to make a whole lot of bubbles. In this experiment yeast is a catalyst. A catalyst speeds up a chemical reaction. Once the chemical reaction is over touch the foam – how does it feel? You might notice that the foam is a little bit warm. This chemical reaction is an exothermic one, that means that the chemical reaction produced a little heat.

Here are some websites and books that will give you more chemical reaction experiments to try:

Words to Know:

Chemical Reaction – When a substances or substances is changed into a new substance.
Exothermic – A chemical reaction that produces heat.
Catalyst – Something that makes a chemical reaction happen faster.

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Hannah BakerAlcoholic Fermentation in YeastMeasure depth in millimeters.Sucrose ConcentrationDepth of CO2bubbles at:0 minutes10 minutes20 minutes0% (plain water)0mm0mm1mm1% sucrose0mm2mm3mm5% sucrose0mm3mm5mm10% sucrose0mm3mmSucrose ConcentrationBalloon Description0 minutes10 minutes20 minutes0% (plain water)Flat Flat Flat 1% sucroseBottom is standing up, but top is still flatTop of balloon is starting to fill with airBalloon is mostly filled with air, but not standing all the way up 5% sucroseflat Mostly flat top is fillingwith air Top of balloon is still filling, but bottom is full 10% sucroseflatBalloon is standing, butnot full Balloon is full and standing While you're waitingfor the 10 minute and 20 minute data collections, complete questions 1-8 below. Answer questions 9 and 10 after you have collected all your data.Questions:1.Is the water bottle sealed with a balloon an aerobic or anaerobic environment? Anaerobic 2.What will be the independent variable in your experiment?

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