Endothermic And Exothermic Reactions Ss

For my experiment, I will be mixing yeast and hydrogen peroxide together, Experimental Question: How does the absorption and release of energy affect temperature change during a chemical reaction? I think my experiment will release more energy resulting in overall warmer temperature. Materials Needed : ● 2 teaspoons active yeast ● Liquid measuring cup ● Measuring teaspoon ● Water at room temperature ● Container for mixing yeast ● Large cup ● Thermometer or temperature probe ● Hydrogen peroxide ( use 3 %, the kind sold for home use) - at room temperature ● Spoon Safety Procedures: -

Adult supervision

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Don’t leave the experiment unattended

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Make sure to do this is in a sink or somewhere else because it is messy

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Clean up spills

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Wash hands Experimental Procedures:

1. First, pour 100 mL of water into a graduated cylinder to measure it then pour it into a cup 2. Then, add 2 teaspoons of dry yeast to the water and thoroughly mix 3. Take the temperature of the mixture to make sure it’s room temperature 4. Then place the cup of the mixture into a sink or somewhere safe so it doesn’t get messy

5. Then, measure 100 mL of hydrogen peroxide and take the temperature until it’s room temperature 6. Then, add the hydrogen peroxide into the yeast and water mixture 7. After the reaction slows, take the temperature and it should be hotter

Reaction

Before

During

After

Hydrogen Peroxide

77° Cold against skin Clear 100 mL

Fizzed up with bubbles and overflowed the cup

90° Felt warm against skin

Yeast

Brown 2 Teaspoons 77° when yeast and water is mixed together

In conclusion, it was an exothermic reaction because it released more energy than it absorbed resulting in a warmer temperature.