Question

06.02 Endothermic and Exothermic: Baking Soda and Vinegar
Materials:

one disposable plastic (not polystyrene—also referred to as Styrofoam™) cup
one disposable plastic spoon (plastic fork or knife may be used)
thermometer (if you have one)
measuring cup and spoon
newspaper (Use it to cover the countertop next to the kitchen sink. This could get a little messy!)
baking soda
vinegar

Procedure:

Measure two tablespoons of baking soda and pour it into the clean, dry plastic cup.

Measure out one cup of vinegar.

If you have a thermometer,

Answer 1

Procedure:

Measure two tablespoons of baking soda and pour it into the clean, dry plastic cup.

Measure out one cup of vinegar.

If you have a thermometer, place it in the measuring cup of liquid and write down the initial temperature.

Grasping the plastic cup near the bottom with one hand, pour the liquid into the plastic cup with your other hand.

Continue to grasp the cup as you stir the solution gently with the plastic spoon. Observe any temperature change felt through the plastic cup.

If you have a thermometer, record the temperature change as you stir the solution very gently.

When you are done making observations, it is safe to pour the solution down the sink and to dispose of the plastic cup and spoon in the trash. Be sure to wash the measuring spoon, measuring cup, and thermometer before putting them away.

Answer 2

1)Describe the chemical combination that you investigated in the hands-on lab activity. Also describe any observations from the investigation, including the temperature change of the container.
2)Based on your observations, was the reaction that you investigated endothermic or exothermic? Explain your answer in complete sentences.
3)Are the chemical reactions that take place when a battery is connected endothermic or exothermic? Be specific as you explain your answer.
4)Freezing and melting are two different physical changes that involve the same amount of energy. Compare and contrast the potential energy diagrams that would represent each of these processes. Be specific in your comparison.

Answer 3

This looks a lot like you want people to do all the work for you which is not the purpose of this site. How about you try it and if you get stuck then you ask a question.

Answer 4

can someone explain how to do number four? i do not understand what the "potential energy diagrams that would represent each of these processes" are or how to describe them.