Conservation of Mass Ziplock Bag Lab

Natalie Ramirez
11 Dec 201403:15

Summary

TLDRThis lab experiment demonstrates the conservation of mass by comparing the mass before and after a chemical reaction. Participants measure the mass of vinegar and baking soda separately, then combine them in a Ziploc bag to observe the reaction. The mass is recorded before and after to check for conservation. A similar procedure is repeated with water and calcium chloride. The experiment aims to show that mass is conserved even when it changes form during chemical reactions.

Takeaways

  • 🧪 The lab experiment is focused on demonstrating the conservation of mass.
  • 🔬 Two different experiments will be conducted, but with the same procedure.
  • 📏 The first step is to measure the mass of vinegar using a graduated cylinder.
  • ➡️ The cylinder's mass is zeroed out before adding vinegar to ensure accuracy.
  • 💧 Approximately 10 milliliters of vinegar is added to the cylinder.
  • 📝 The mass of the vinegar is recorded as 'Mass before' for the experiment.
  • 🛍️ A Ziploc bag is used to contain the baking soda for the second part of the experiment.
  • 🏗️ The mass of the Ziploc bag is zeroed out before adding baking soda.
  • 📐 A teaspoonful of baking soda is added, and its mass is recorded as 'Mass before'.
  • 🔄 The reaction between vinegar and baking soda is initiated by sealing the bag and recording the 'Mass after'.
  • 🔄 The conservation of mass is verified by comparing the sum of 'Mass before' with the 'Mass after'.
  • 💧 A second experiment is planned with water and calcium chloride, following the same procedure.

Q & A

  • What is the main objective of the lab experiment described in the transcript?

    -The main objective of the lab experiment is to demonstrate the conservation of mass through two different experiments involving chemical reactions.

  • What is the first substance measured for mass in the experiment?

    -The first substance measured for mass is vinegar, which is contained in a cylinder.

  • How much vinegar is approximately added to the cylinder for the experiment?

    -Approximately 10 milliliters of vinegar is added to the cylinder.

  • Why is the mass of the cylinder zeroed out before adding vinegar?

    -The mass of the cylinder is zeroed out to ensure that only the mass of the vinegar is recorded, not the combined mass of the cylinder and the vinegar.

  • What is the next step after measuring the mass of the vinegar?

    -After measuring the mass of the vinegar, the vinegar is set aside and the scale is zeroed out again to measure the mass of a Ziploc bag.

  • Why is the Ziploc bag's mass not included in the measurement?

    -The Ziploc bag's mass is not included to isolate the mass of the baking soda being added, ensuring the measurement reflects only the baking soda's mass.

  • How much baking soda is approximately added to the Ziploc bag?

    -Approximately a teaspoonful of baking soda is added to the Ziploc bag.

  • What is the purpose of zipping the Ziploc bag up partially before adding vinegar?

    -The Ziploc bag is zipped up partially to allow for the controlled addition of vinegar and to capture all the gas produced during the reaction.

  • How is the conservation of mass checked after the reaction?

    -The conservation of mass is checked by adding the mass before the reaction (vinegar and baking soda) and comparing it to the mass after the reaction.

  • What is the second set of substances used in the experiment?

    -The second set of substances used in the experiment are water (10 mL) and calcium chloride powder.

  • What is the significance of the conservation of mass in this experiment?

    -The significance of the conservation of mass in this experiment is to show that in a closed system, the total mass of matter remains constant despite changes in the state of matter or chemical reactions.

Outlines

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Keywords

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Highlights

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Transcripts

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相关标签
Chemistry LabMass ConservationVinegar ReactionBaking SodaScience ExperimentEducational ContentLab ProcedureChemical ReactionTeaching AidScience Education
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