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lap report Physical Science | Graded Assignment | Endothermic and Exothermic Reactions Name: Date: Graded Assignment Lab Report: Endothermic and Exothermic Reactions Purpose of the Lab The purpose of...

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Physical Science | Graded Assignment | Endothermic and Exothermic Reactions
Name:
Date:
Graded Assignment
Lab Report: Endothermic and Exothermic Reactions
Purpose of the Lab
The purpose of this lab is to help you visualize endothermic and exothermic reactions. You will ca
y out two
chemical reactions and use your knowledge of chemical reactions to decide which one is endothermic and which
one is exothermic.
In the first reaction, you will mix Epsom salts (magnesium sulfate) with water. In the second reaction, you will mix
yeast with hydrogen peroxide.
Hypothesis
1. Record your best “educated guess” about what will happen in the experiment. Give your reasons and outline
any assumptions that lead you to this hypothesis.
Answer:
Type your answer here.
Materials
You will need the following materials for this lab.
• Thermometer
• room temperature water
• 1 tablespoon of Epsom salts (can be found at a drug store or pharmacy)
• 2 medium-sized glass jars or beakers (needs to be glass)
• a spoon
• 1 tablespoon of quick rising dry yeast
• ¼ cup of 3% hydrogen peroxide (the kind you can buy at the store)
Experimental Design
To complete the first reaction, ca
y out the following steps:
1. Fill one glass jar with room temperature water.
2. Place your hand on the outside of the jar and record how warm or cool the jar feels.
3. Place the thermometer in the water and record the actual temperature of the water.
4. Remove the thermometer and stir in the Epsom salts.
5. Feel the jar again and record how warm or cool it feels.
6. Again, place the thermometer in the jar and record the actual temperature of the water.
7. Remove the thermometer and rinse it off. Save it for use later.
To complete the second reaction, ca
y out the following steps:
1. Place the thermometer in your other jar.
2. Stir the hydrogen peroxide and the yeast together in the jar.
3. Record the temperature of the peroxide and yeast mixture.
4. Wait 3 minutes and record the temperature again.
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Physical Science | Graded Assignment | Endothermic and Exothermic Reactions
5. Feel the bottom of the jar and record how warm or cool it feels.
6. Safely discard your used materials and clean up after yourself.
Observations/Data
1. Record the observations and/or data you collected here.
Answer:
Type your answer here.
Analysis
2. Analyze the data you collected in the lab.
Answer:
Type your answer here.
Conclusion
1. After conducting the experiment, how would you now explain the problem(s) or answer the question(s) raised
when you described the purpose of the lab. Be sure to base your answer on the data you collected. Consider
whether your conclusion is the only explanation for the data you collected, or if there could be alternate
explanations. Which reaction was endothermic and which one was exothermic? How do you know?
Answer:
Type your answer here.
Discussion Summary
2. Please summarize how you responded to the discussion and the comments made to your post here.
Answer:
Type your answer here.
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    Graded Assignment
    Lab Report: Endothermic and Exothermic Reactions
Answered Same DaySep 06, 2021

Solution

Yasodharan answered on Sep 09 2021
57 Votes
Hypothesis:
Epsom salt while reacts with water it tends to form new bond on dissolution, in other hand hydrogen peroxide decomposes naturally to hydrogen and oxygen gas by evolving small amount of energy so by adding yeast will fasten the decomposition reaction. Hence, we can approximate hypothesis Epsom salt = Endothermic & Hydrogen peroxide + yeast = Exothermic
Observations/Data:
Two beakers are cleaned with distilled water and dried before conducting test, equal amount of water is taken in two beaker and its temperature are observed by touching on the surface feeling little cool (room temperature). In one beaker Epsom salt is added and temperature is of no change as touching beaker surface is still cold, by mixing Epsom salt vigorously complete dissolution is achieved and little warmness is observed by touching surface of beaker (slight rise in temperature).
In another beaker H2O2 is added first and sti
ed slowly to make complete dissolution of H2O2 in water. Before mixing temperature of beaker...
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