Endothermic Exothermic Lab Template Kr

Endothermic and Exothermic Reactions Portfolio Directions Unit 3 Lesson 5 Materials:  vinegar  baking soda  plastic bag or bowl  measuring cup  spoon  thermometer Introduction: The purpose of this lab is to test whether heat is absorbed (exothermic reaction) or released (endothermic reaction) during a chemical reaction. In this experiment I will be mixing vinegar and baking soda to see what the reaction and end result is. Will it change temperature, will it foam up? Is it going to be and exothermic or endothermic reaction? We will be finding out Hypothesis: My hypothesis is that the reaction of the vinegar will be to fizz up and change temperature. I feel like the temperature might become a few degrees warmer as energy is absorbed through the mixture Procedure: 1. Make sure the surface area is sanitary 2. Gather ingredients and tools 3. Begin to measure the vinegar and get a spoonful of baking soda ready 4. Pour the vinegar in the bowl and measure the temp. 5. Pour the baking soda in and quickly measure the temperature after 6. Throughout the process write everything down Safety: Be careful not to spill the ingredients and wear goggles when pouring the mixtures together.

Data: Reaction

Observations

Observations

Observations

Baking Soda + Vinegar

before reaction 71.2 degrees

during reaction Foamed quickly

after reaction 61.9

Smelly

Bag popped

Bubbly

clear

fizzy

71.2 degrees

Fizzed up quickly

Calmed down (still smelly) 66.7

(in bag)

Baking Soda + Vinegar

Smelly (in bowl)

Bubbly Got colder

clear

Flattened out fast

Conclusion: In conclusion, my hypothesis was partially correct. I said that the vinegar would fizz up and change temperature, specifically get warmer. The vinegar did fizz up, but the temperature got colder by a few degrees. I performed this experiment three times, once in a plastic bag, and twice in a bowl and each time the temperature went down. You can see the energy being released in the form of bubbles during the reaction. You can also see energy being released in the form of temperature dropping. This reaction was endothermic and it releases more heat than an exothermic reaction.