ChemCollective-Virtual-Labs/C2/Density-of-Solids-and-Liquids/English

Visual Cue	Narration
Slide Number 1 Title Slide	Welcome to this tutorial on Density of Metals and Liquids using Vlabs.
Slide Number 2 Learning Objectives	In this tutorial, we will learn to determine, Densities of Metals and liquids.
Slide Number 3 Pre-requisites www.spoken-tutorial.org	To follow this tutorial you should be familiar with, ChemCollective Vlabs interface. If not, for relevant tutorials please visit our website.
Slide Number 4 System Requirement	Here I am using, Mac OS version 10.10.5 ChemCollective Vlabs version 2.1.0 Java version 8.
Cursor on the window.	Here I have opened a Vlabs window.
Click on File->Load homework option.	Click on File menu and select Load homework option.
Select Molarity and Density from the list.	Select Molarity and Density from the list.
Click on Metal density problem from the drop down menu	Double-click on Metals Density Problem from the sub-menu.
Go to Problem description in the Stockroom explorer.	Go to Problem description in the Stockroom explorer.
Point to problem.	Pause the video to read the problem and then resume again.
Point to problem. Silver-10.5, Rhodium-12.4 and Platinum- 21.45 grams per cubic centimeter.	Problem states that you have 3 unlabeled bottles with metallic powder. You need to identify the metals in the bottles. The metal densities are given in the problem description. We will use Archimedes' Principle to find the densities of metals.
Slide Number 5 Archimedes Principle	An object when immersed in water will displace water. The displaced water will be equal to its volume.
Slide Number 6 Archimedes Principle	Different metals have different densities. Hence, different metals of the same weight have different volumes. A metal that is less dense will displace more water than a denser one.
Click on Workbench	Switch to Workbench
Cursor on the stockroom explorer.	Double Click on Metal 1, Metal 2, Metal 3 to add them to the Workbench. Double click on water icon.
Go to Click to select new glassware from the drop down menu Select Graduated Cylinders. A sub menu appears. Click on 25ml Graduated Cylinder.	Click on Glassware icon. Select Graduated Cylinders. From the sub-menu select 25 ml Graduated Cylinder.
Right-click on Graduated Cylinder. Context menu opens.	We need three 25 ml Graduated Cylinders for this experiment. Right-click on Graduated Cylinder. Context menu opens. Using Duplicate option make 2 copies of the Graduated Cylinder.
Click and hold the left mouse button. Drag over the cylinders to select. Click on any cylinder >> drag to the convenient position.	Drag and bring the Graduated Cylinders to the centre of the Workbench.
Right-click on Graduated Cylinder. From the Context-menu select Rename option. Text box opens, type 1 in the text box and click Ok button.	Label the Cylinders as 1, 2 and 3.
Drag graduated cylinder 1 to the Distilled water tank. Point to the red warning icon.	Let us drag graduated cylinder 1 to the water tank. Notice that a red warning icon appears. This indicates that procedure is incorrect. Place graduated cylinder 1 aside. The correct procedure is to drag water on to the graduated cylinder.
Tools>>Transfer bar>>Precise transfer.	Change the transfer mode to Precise Transfer using Tools menu.
Type 10 in the Transfer amount input bar>> click on pour. Point to the graduated cylinder.	Type 10 in the Transfer amount input bar. Click on pour. 10 ml of water is transferred into the graduated cylinder 1.
Type 10 in the Transfer amount input bar >> click on pour.	Likewise transfer 10ml of water into graduated cylinders 2 and 3.
Drag the water tank to a different place on the Workbench	Move the water tank to a different place on the Workbench.
Click on Select Tools menu, from the list, select Scale.	Click on Select Tools menu, from the list, select Scale. Drag the Scale to a convenient position on the Workbench.
Click on Select Tools menu >>from the list select Weighing Boat.	Again click on Select Tools menu, from the list select Weighing Boat.
Right-click on Weighing Boat. Context menu opens. Using copy and paste option make 2 copies of the Weighing Boat.	We need three Weighing Boats for this experiment. We can also use short-cut keys, to copy and paste. Click on Weighing Boat. Use Ctrl-C to copy and Ctrl-V to paste.
Click and hold the left mouse button. Drag over the weighing boats to select. Click on any weighing boat >> drag to the convenient position.	Drag and bring the weighing boats to the centre of the Workbench
Right-click on Weighing Boat. From the Context-menu select Rename option. Text box opens, type 1 in the text box and click Ok button.	Label the Weighing Boats as 1, 2 and 3.
Place weighing boat 1 over the scale.	Place weighing boat 1 over the scale. Click on TARE button on the scale.
Drag the Metal 1 over the weighing boat.	Drag Metal 1 over to weighing boat 1.
Type 50 in the Transfer Amount(g) input bar. Click on Pour. Drag the bottle.	Type 50 in the Transfer Amount(g) input bar Click on Pour. Place the bottle aside.
Cursor on the weighing boat. Drag the weighing boat 1 over the graduated cylinder 1.	Remove the weighing boat from the scale. Place weighing boat 1 over the graduated cylinder 1.
Type 50 in the Transfer amount input bar below. Click on Pour.	Type 50 in the Transfer Amount input bar . Click on Pour.
Point to graduated cylinder. Drag weighing boat 1 aside.	Observe the level of water in the cylinder. It has risen by 5 ml. Keep the weighing boat 1 aside.
Place weighing boat 2 over the scale. Click on TARE button on the scale.	Now, Place weighing boat 2 on the scale. Click on TARE button on the scale.
Drag Metal 2 over the weighing boat.	Drag Metal 2 over weighing boat 2.
Type 50 in the Transfer Amount(g) input bar Click on Pour. Drag the bottle.	Type 50 in the Transfer Amount(g) input bar. Click on Pour. Place the bottle aside.
Click on the weighing boat and drag. Place weighing boat 2 over the graduated cylinder 2.	Remove the weighing boat 2 from the scale. Place weighing boat 2 over the graduated cylinder 2.
Type 50 in the Transfer Amount(g) input bar. Click on Pour.	Type 50 in the Transfer Amount(g)input bar. Click on Pour.
Point to graduated cylinder 2. Keep the weighing boat 2 aside.	Observe that the water level in the cylinder has risen by 4 ml. Keep the weighing boat 2 aside.
Place weighing boat 3 over the graduated cylinder 3.	Similarly, weigh 50 grams of metal 3 using weighing boat 3. Place weighing boat 3 over the graduated cylinder.
Type 50 in the Transfer Amount(g) input bar. Click on Pour.	Type 50 in the Transfer Amount(g) input bar. Click on Pour.
Point to graduated cylinder 3. Keep the weighing boat 3 aside.	Water level in the cylinder has risen by 2.5 ml. Keep the weighing boat 3 aside.
Slide Number 7 Results Calculate the densities using the formula: Density= mass/volume. Solid Mass (m) Volume (V) = V2-V1 Density= m/V Given Density Metal Metal 1 50 g 15-10=5 50/5=10 10.5 Silver Metal 2 50 g 14-10=4 50/4=12.25 12.4 Rhodium	This slide shows the density calculations for the metals. Calculate the densities using the formula: Density= mass/volume. Experimental density of Metal 1 is 10 which corresponds to Silver. Metal 2 is 12.2 which corresponds to Rhodium. Metal 3 is 20 which corresponds to Platinum.
Slide Number 8 Assignment	Repeat the above experiment with different metal weights (30 g and 40 g). Tabulate and analyse your results.
Cursor on the Workbench	Lets proceed to the liquid density problem.
Click on File->New workbench option.	Let us add a new workbench. Click on File and select New workbench option. Click on the workbench.
Go to File->Load homework option	Go to File menu and select Load homework option.
Select Molarity and Density from the list.	Select Molarity and Density from the list.
Click on Liquid density problem.	Double-click on Liquid density problem.
Click on problem description in the stockroom explorer.	Double-click on problem description in the stockroom explorer.
Point to problem.	Pause the video to read the problem statement. Resume after reading.
Cursor on the problem description.	The problem states that there are two compounds of A-1 and A-2. One of the liquids is a preservative, other liquid is not a preservative. The preservative has higher density. Our aim is to find the liquid containing Preservative. For this we need to measure densities of A-1 and A-2.
Click on Workbench	Switch back to Workbench
Click on the two compounds A-1 and A-2 to add to it to work bench	Double-click on compounds A-1 and A-2 to add them to Workbench.
Go to Click to select new glassware from the drop down menu. Select Volumetrics. A sub menu appears. Click on 100ml volumetric flask.	Obtain a 100ml volumetric flask from the glassware option.
Right-click on Volumetric flask. From the Context-menu select Duplicate option.	We need two 100ml volumetric flasks for this experiment. We can make a copy using Duplicate option.
Drag and bring the flasks to the centre of the workbench.	Drag and bring the flasks to the center of the workbench.
Select Volumetric flask. Press F2 . Enter A-1 in the text box Click on OK. Similarly press F2 to rename other flask as A-2.	Label the flasks A-1 and A-2. We can rename by pressing F2.
Click on Click to select tools from the drop down menu. Select Scale and add it to the Workbench	Click on Select tools icon. Select Scale and add it to the Workbench.
Place one 100ml volumetric flask on the scale >> click on TARE button.	Place the volumetric flask A-1 on the scale. click on TARE button.
Transfer 100ml of Compound A1 to the 100ml volumetric flask by Precise Transfer mode	Transfer 100ml of Compound A1 to flask A-1 by Precise Transfer mode.
Point to scale. Place the flask A-1 aside. Remove Volumetric flask from the scale.	Note the mass from the scale. Scale reads 126 g. Note this value. Place the flask A-1 aside. Remove Volumetric flask from the scale.
Place flask A-2 on the scale, click on TARA button. Transfer 100ml of Compound A1 to flask A by Precise transfer mode.	Next place flask A-2 on the scale, click on TARE. Pour 100 ml of Compound A-2. Scale reads 85 g. Note this value.
Slide number 9 Results Calculate densities using the formula: Density=mass/volume Liquid Mass (m) Volume (V) Density=m/v A-1 126.0 g 100 mL 126/100=1.26 g/mL A-2 85.0 g 100 mL 85/100=0.85 g/mL	Experimental results are tabulated on this slide. Calculate densities using the formula: Density=mass/volume Observe that density of Compound A-1 is more than Compound A-2. Therefore Compound A-1 contains the preservative.
Slide Number 10 Summary	Let's summarize. In this tutorial we have learnt to measure, Densities of silver, rhodium and platinum using Archimedes' Principle. Densities of liquids with unknown concentration.
Slide Number 11 Assignment	For the assignment. Open default lab setup window. You will find many stock solutions. Find density for a few solutions of your choice.
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Slide Number 15: Acknowledgement	Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India. More information on this mission is available at this link.
	This tutorial is contributed by Snehalatha Kaliappan and Madhuri Ganapathi from IIT-Bombay. Thank you for joining

Contributors and Content Editors

Madhurig, Snehalathak