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.

Outlines

00:00

🧪 Lab Experiment: Conservation of Mass

The script outlines a lab experiment focused on demonstrating the conservation of mass through two different experiments involving vinegar and baking soda, and water and calcium chloride. The procedure begins with measuring the mass of vinegar using a graduated cylinder, ensuring the cylinder's mass is zeroed out first. Approximately 10 milliliters of vinegar is added, and its mass is recorded. Next, a Ziploc bag's mass is disregarded by zeroing the scale before adding a teaspoonful of baking soda, recording its mass. The reaction is initiated by adding vinegar to the baking soda in the bag, ensuring the bag is sealed to capture the gas produced. The total mass after the reaction is recorded and compared to the sum of the masses before the reaction to verify conservation of mass. The same procedure is repeated with water and calcium chloride.

Keywords

💡Conservation of Mass

The principle of conservation of mass states that matter cannot be created or destroyed in an isolated system. In the context of the video, this principle is central to the experiment as the goal is to demonstrate that the total mass of reactants (vinegar and baking soda) equals the total mass of the products after their chemical reaction.

💡Lab Experiment

A lab experiment is a scientific procedure conducted in a laboratory to test a hypothesis or demonstrate a scientific principle. The video describes a lab experiment designed to find the conservation of mass, where two different chemical reactions are carried out to observe if the mass is conserved before and after the reactions.

💡Cylinder

In the video, a cylinder refers to a piece of laboratory equipment used to measure the volume of liquids. It is used to contain vinegar for the purpose of measuring its mass, highlighting the importance of accurate measurement in scientific experiments.

💡Zeroing Out

Zeroing out is the process of setting a scale or measuring device to read zero to ensure that the measurement taken is only of the substance being measured, without the influence of the container's weight. In the script, the cylinder is zeroed out before adding vinegar to accurately measure its mass.

💡Milliliters

Milliliters (mL) are a unit of volume measurement used to quantify liquids. The video mentions adding 'approximately 10 milliliters' of vinegar, indicating the need for precision in measuring the volume of the liquid for the experiment.

💡Mass Before

The term 'mass before' refers to the total mass of substances before a reaction takes place. In the video, the mass of vinegar and baking soda is measured and recorded separately before mixing them, to later compare it with the 'mass after' to check for conservation of mass.

💡Ziploc Bag

A Ziploc bag is a type of plastic storage bag with a sealable closure, used in the experiment to contain the chemical reaction. The script describes adding baking soda to a Ziploc bag and then sealing it to prevent gas from escaping during the reaction.

💡Baking Soda

Baking soda, or sodium bicarbonate, is a chemical compound used in the experiment as one of the reactants. It reacts with vinegar to produce carbon dioxide gas, water, and salt, which is a key part of demonstrating mass conservation in the video.

💡Reaction

In the context of the video, a reaction refers to the chemical process where two or more substances interact to form new substances. The script details a reaction between vinegar and baking soda, where the mass before and after the reaction is compared to demonstrate the conservation of mass.

💡Mass After

The term 'mass after' refers to the total mass of substances and products after a reaction has taken place. The video involves recording the mass of the Ziploc bag containing the reaction products to compare with the 'mass before' and verify the conservation of mass.

💡Calcium Chloride

Calcium chloride is a chemical compound mentioned in the video as an alternative powder to be used in a second experiment, similar to baking soda. It is used to demonstrate that the principle of mass conservation can be applied to different chemical reactions.

Highlights

Lab experiment to demonstrate conservation of mass

Two different experiments with the same procedure

Measuring the mass of vinegar using a graduated cylinder

Zeroing out the cylinder to exclude its mass

Adding approximately 10 milliliters of vinegar

Recording the mass of vinegar before the reaction

Using a Ziploc bag to contain the baking soda

Zeroing out the scale with the Ziploc bag

Adding a teaspoonful of baking soda

Recording the mass of baking soda before the reaction

Preparing for the chemical reaction by zipping the bag

Pouring vinegar into the bag with baking soda

Ensuring the bag is sealed to capture gas

Recording the mass after the reaction

Comparing the mass before and after the reaction

Repeating the procedure with water and calcium chloride

End of the procedure explanation

Transcripts

go for it okay so today we're going to

be doing a lab experiment where we're

going to be finding the conservation of

mass and we're going to do two different

kinds of experiments um but the

procedure will be the same for both so

the first thing we're going to do is

we're going to find um the mass of

vinegar so in order to do that we need

to contain it in the cylinder and find

its actual amount and so we have a

cylinder but we don't want the mass of

the cylinder so we're going to actually

zero this out

and now we're going to add some vinegar

approximately 10

milliters so it doesn't have to be

exactly 10 but around there it's

fine and after we do that then you're

going to record the mass so since we

already zeroed it out with the graduated

cylinder this is only the mass of the

vinegar itself so we're going to record

that where it says Mass before

for the vinegar is

10.0

G then you're going to take that off and

set it aside for the

moment and we're going to press zero

again and now we're going to add a

Ziploc bag onto the

scale and once again we don't want the

mass of the Ziploc bag so we're going to

press

zero and now we're going to add some

baking soda again it doesn't really

matter exactly how much but we're going

to add some to it about a

teaspoonful and we're going to find the

mass of

both and now this is just the mass of

the baking

soda so 5.8 gr yours might be different

and you're going to write that number

down right next to where you wrote the

mass of the vinegar on the mass before

line because we haven't done the

reaction

yet okay now what we're going to do is

we are ready now for the reaction and

we're going to zip the Ziploc bag up

just a bit and have only a small section

of the Ziploc bag open so that we can

capture all the gas that we're going to

be making here

soon and carefully pour in the vinegar

quickly zip that up and let that

react

and then you're going to want to make

sure the whole bag is

on is on the scale so you get the

accurate mass of everything

inside and then you're going to write

that down as your math after the

reaction and then what you can do is add

up the mask before of the vinegar and

the baking soda and see if it matches

your mass

afterwards and then we'll be doing the

same procedure but with instead you're

going to use water 10 MLS of water and

your powder is instead going to be

calcium chloride doing the same thing we

just did and that's the end of the

procedure