Conservation of Mass Ziplock Bag Lab

Summary

This 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.