Materials

-sandwich-sized plastic ziplock bag
-graduated cylinder
-paper cup
-rubber band
-measuring spoons
-vinegar
-baking soda
-twist-tie (like the closure for a loaf of bread)

Part 1: The Reaction
1.Use the paper cup during this part of the experiment.

2.Measure out 25.0 mL of vinegar and pour into the cup.

3.Measure out 1/2 tsp. of baking soda using a piece of paper towel to hold the baking soda. In the data table below, record the amount of baking soda used.

4.Add the baking soda to the vinegar slowly. Don't let the bubbles overflow the cup. Observe the reaction and record in the data table.

5. Before moving on to Part 2, answer the analysis questions for Part 1.

Data Table Part 1
Amount of vinegar=
Amount of baking soda =
Observations of reaction=

Part 2: Conserving Mass

1.You may use any of the listed materials for this part of the procedure. If you were to mass the contents before and after the reaction, you would notice that the mass was less after the reaction than before.

2.Based on your answer to #2 in the Part 1 analysis questions, devise a method for repeating the experiment without losing any mass. Use the same amount of reactants, but you may use the different items from the materials list. Part 2 of the analysis questions will ask you to write the procedure that you used.

Analysis Part 1
1.Did mass appear to be conserved during this chemical reaction? In other words, did it look like there was more or less mass than what you started with? Simply describe what you saw, not what you think should have happened. Use complete sentences for your answer.

2.If you could mass the reactants before and after the reaction, you would see that the mass was less after the reaction. Based on what you observed during the reaction, where did the extra mass go? Remember that mass cannot be destroyed in chemical reactions.

3.Please describe how you performed the procedure in Part 2. Your answer should be in paragraph form, third person, and past tense. For example: "Fifty milliliters of water was placed in the flask" not "I placed fifty milliliters of water in the flask". Please be specific when describing your materials and methods.

4.Describe how your experiment might prove that mass was conserved.

double post. See my response to your first post.

1. To perform the experiment, you will need the following materials: a sandwich-sized plastic ziplock bag, a graduated cylinder, a paper cup, a rubber band, measuring spoons, vinegar, baking soda, and a twist-tie (like the closure for a loaf of bread).

Part 1: The Reaction
1. Begin by using the paper cup for this part of the experiment.

2. Measure out 25.0 mL of vinegar using the graduated cylinder, and pour it into the cup.

3. Measure out 1/2 teaspoon of baking soda using a measuring spoon. Hold the baking soda on a piece of paper towel to make it easier to transfer. Make sure to record the amount of baking soda used in the data table.

4. Slowly add the baking soda into the vinegar in the cup. Be careful not to let the bubbles overflow the cup. Observe the reaction and record your observations in the data table.

5. Before proceeding to Part 2, answer the analysis questions for Part 1.

Data Table for Part 1:
- Amount of vinegar: 25.0 mL
- Amount of baking soda: 1/2 teaspoon
- Observations of reaction: Record your observations of the reaction in this section.

Part 2: Conserving Mass
1. For this part of the procedure, you have the freedom to choose any of the listed materials. It is important to note that if you were to measure the mass of the contents before and after the reaction, you would notice a decrease in mass.

2. Based on the answer to question #2 in the analysis questions for Part 1, devise a method to repeat the experiment without losing any mass. The goal is to use the same amount of reactants but different materials from the list. You will write the procedure in Part 2 of the analysis questions.

Analysis Part 1:
1. Describe whether mass appeared to be conserved during this chemical reaction. Simply explain what you observed without speculating. Use complete sentences to answer this question.

2. Based on your observations during the reaction, explain where the extra mass went. Remember that mass cannot be destroyed in chemical reactions.

3. Write a paragraph in the past tense, third person, and in complete sentences to describe how you performed the procedure in Part 2. Make sure to be specific when mentioning the materials and methods used.

4. Explain how your experiment could prove that mass was conserved.