PoojaMoolya: Created page with "{|border=1 ||'''Time''' ||'''Narration''' |- ||00:01 || Welcome to this tutorial on '''Density of Metals and Liquids''' using '''Vlabs'''. |- || 00:08 || In this tutori..."

2019-01-30T10:40:54Z

Created page with "{|border=1 ||'''Time''' ||'''Narration''' |- ||00:01 || Welcome to this tutorial on '''Density of Metals and Liquids''' using '''Vlabs'''. |- || 00:08 || In this tutori..."

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{|border=1
||'''Time'''
||'''Narration'''

|-
||00:01
|| Welcome to this tutorial on '''Density of Metals and Liquids''' using '''Vlabs'''.

|-
|| 00:08
|| In this tutorial, we will learn to determine, Densities of Metals and liquids.

|-
|| 00:14
|| To follow this tutorial you should be familiar with, '''ChemCollective Vlabs''' interface.

If not, for relevant tutorials please visit our website.

|-
|| 00:26
|| Here I am using, Mac OS version 10.10.5

ChemCollective Vlabs version 2.1.0

|-
|| 00:36
|| Java version 8.

|-
|| 00:39
|| Here I have opened a '''Vlabs''' window.

|-
|| 00:43
|| Click on '''File menu''' and select '''Load homework''' option.

|-
|| 00:48
|| Select '''Molarity and Density''' from the list.

|-
|| 00:52
|| Double-click on '''Metals Density Problem''' from the sub-menu.

|-
|| 00:57
|| Go to '''Problem description''' in the '''Stockroom explorer.'''

|-
|| 01:02
|| Pause the video to read the problem and then resume again.

|-
|| 01:07
|| Problem states that you have 3 '''unlabeled''' bottles with '''metallic''' powder.

You need to identify the metals in the bottles.

|-
|| 01:17
|| The metal '''densities''' are given in the '''problem description'''.

We will use '''Archimedes' Principle''' to find the densities of metals.

|-
||01:28
|| An object when immersed in water will displace water.

The displaced water will be equal to its volume.

|-
|| 01:38
|| Different metals have different densities.

Hence, different metals of the same weight have different volumes.

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|| 01:47
|| A metal that is less dense will displace more water than a denser one.

|-
|| 01:53
|| Switch to '''Workbench'''

|-
|| 01:56
|| Double Click on '''Metal 1, Metal 2, Metal 3''' to add them to the '''Workbench.'''

Double click on '''water''' icon.

|-
||02:06
|| Click on '''Glassware''' icon.

Select '''Graduated Cylinders'''.

|-
|| 02:12
|| From the sub-menu select '''25 ml Graduated Cylinder.'''

|-
|| 02:17
|| We need three 25 ml ''' Graduated Cylinders''' for this experiment.

|-
|| 02:23
|| Right-click on '''Graduated Cylinder.'''

|-
|| 02:26
|| '''Context menu opens.'''

Using '''Duplicate''' option make 2 copies of the '''Graduated Cylinder'''.

|-
|| 02:34
|| Drag and bring the '''Graduated Cylinders ''' to the centre of the '''Workbench'''.

|-
||02:41
|| Label the '''Cylinders''' as 1, 2 and 3.

|-
|| 02:49
|| Let us drag '''graduated cylinder 1''' to the water tank.

|-
|| 02:54
|| Notice that a red warning icon appears.

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|| 02:58
|| This indicates that procedure is incorrect.

Place '''graduated cylinder 1''' aside.

|-
|| 03:06
|| The correct procedure is to drag '''water''' on to the '''graduated cylinder.'''

|-
|| 03:12
|| Change the transfer mode to '''Precise Transfer''' using '''Tools''' menu.

|-
||03:17
|| Type 10 in the '''Transfer amount input bar.'''

Click on '''pour.'''

|-
|| 03:23
|| 10 ml of water is transferred into the '''graduated cylinder 1.'''

|-
||03:29
|| Likewise transfer 10ml of water into '''graduated cylinders 2''' and ''' 3.'''

|-
|| 03:37
|| Move the water tank to a different place on the '''Workbench.'''

|-
|| 03:41
|| Click on '''Select Tools''' menu, from the list, select '''Scale'''.

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|| 03:47
|| Drag the Scale to a convenient position on the Workbench.

|-
|| 03:51
|| Again click on '''Select Tools''' menu, from the list select '''Weighing Boat.'''

|-
||03:57
|| We need three '''Weighing Boats''' for this experiment.

We can also use short-cut keys, to copy and paste.

|-
|| 04:06
|| Click on '''Weighing Boat.'''

Use '''Ctrl-C''' to copy and '''Ctrl-V''' to paste.

|-
|| 04:13
|| Drag and bring the '''weighing boats ''' to the centre of the '''Workbench'''

|-
|| 04:19
|| Label the '''Weighing Boats''' as 1, 2 and 3.

|-
|| 04:24
|| Place '''weighing boat 1''' over the '''scale'''.

Click on '''TARE''' button on the scale.

|-
|| 04:31
|| Drag '''Metal 1 ''' over to '''weighing boat 1.'''

|-
||04:36
|| Type 50 in the '''Transfer Amount(g)''' input bar

Click on ''' Pour. '''

Place the bottle aside.

|-
||04:44
|| Remove the '''weighing boat''' from the ''' scale.'''

Place '''weighing boat 1''' over the '''graduated cylinder 1.'''

|-
|| 04:52
|| Type 50 in the '''Transfer Amount input bar''' .

Click on''' Pour.'''

|-
|| 04:58
|| Observe the level of water in the graduated cylinder.

It has risen by 5 ml.

|-
|| 05:06
|| Keep the '''weighing boat 1''' aside.

|-
|| 05:09
|| Now, Place '''weighing boat 2''' on the '''scale'''.

Click on '''TARE''' button on the scale.

|-
|| 05:16
|| Drag '''Metal 2 ''' over '''weighing boat 2.'''

|-
||05:20
|| Type '''50''' in the '''Transfer Amount(g) input bar'''.

Click on''' Pour.'''

|-
|| 05:26
|| Place the bottle aside.

|-
|| 05:28
|| Remove the '''weighing boat 2''' from the ''' scale.'''

Place '''weighing boat 2''' over the '''graduated cylinder 2.'''

|-
||05:36
|| Type 50 in the '''Transfer Amount(g)input bar'''.

Click on''' Pour.'''

|-
|| 05:42
|| Observe that the water level in the cylinder has risen by 4 ml.

Keep the '''weighing boat 2''' aside.

|-
|| 05:51
|| Similarly, weigh 50 grams of metal 3 using '''weighing boat 3. '''

|-
|| 06:00
|| Place '''weighing boat 3''' over the '''graduated cylinder.'''

|-
|| 06:04
|| Type 50 in the '''Transfer Amount(g) input bar'''.

Click on ''' Pour.'''

|-
|| 06:10
|| Water level in the cylinder has risen by 2.5 ml.

Keep the '''weighing boat 3''' aside.

|-
|| 06:18
|| This slide shows the density calculations for the metals.

Calculate the densities using the formula: Density= mass/volume.

|-
|| 06:29
|| Experimental density of Metal 1 is 10 which corresponds to '''Silver'''.

|-
|| 06:35
|| Metal 2 is 12.2 which corresponds to ''' Rhodium.'''

|-
|| 06:40
|| Metal 3 is 20 which corresponds to '''Platinum.'''

|-
|06:45
|| Repeat the above experiment with different metal weights (30 g and 40 g).

Tabulate and analyse your results.

|-
|| 06:56
|| Lets proceed to the liquid density problem.

|-
||07:00
|| Let us add a new workbench.

Click on''' File''' and select ''' New workbench''' option.

|-
|| 07:08
|| Click on the '''workbench.'''

|-
|| 07:10
|| Go to ''' File''' menu and select '''Load homework''' option.

|-
|| 07:14
|| Select '''Molarity and Density''' from the list.

|-
|| 07:18
|| Double-click on '''Liquid density problem'''.

|-
|| 07:22
|| Double-click on '''problem description''' in the '''stockroom explorer'''.

|-
|| 07:27
|| Pause the video to read the problem statement.

Resume after reading.

|-
|| 07:33
|| The problem states that there are two compounds of '''A-1''' and '''A-2'''.

|-
|| 07:38
|| One of the liquids is a preservative, other liquid is not a preservative.

The preservative has higher density.

|-
|| 07:48
|| Our aim is to find the liquid containing '''Preservative.'''

For this we need to measure densities of '''A-1 '''and '''A-2'''.

|-
|| 07:58
|| Switch back to '''Workbench'''

|-
|| 08:02
|| Double-click on compounds '''A-1''' and '''A-2''' to add them to '''Workbench'''.

|-
|| 08:08
|| Obtain a '''100ml volumetric flask''' from the glassware option.

|-
|| 08:14
|| We need two '''100ml volumetric flasks''' for this experiment.

|-
|| 08:20
|| We can make a copy using '''Duplicate''' option.

|-
|| 08:24
|| Drag and bring the flasks to the center of the workbench.

|-
|| 08:30
|| Label the flasks as '''A-1''' and '''A-2'''.

We can rename by pressing '''F2'''.

|-
|| 08:39
|| Click on '''Select tools '''icon.

Select '''Scale ''' and add it to the '''Workbench.'''

|-
|| 08:46
|| Place the '''volumetric flask A-1 ''' on the scale.

Click on '''TARE''' button.

|-
|| 08:52
|| Transfer 100ml of '''Compound A1''' to '''flask A-1 '''by '''Precise Transfer mode.'''

|-
|| 09:01
|| Note the mass from the scale.

Scale reads '''126 g.'''

|-
|| 09:08
|| Note this value. Place the flask '''A-1''' aside.

|-
|| 09:13
|| Remove '''Volumetric flask''' from the scale.

|-
|| 09:17
|| Next place flask '''A-2''' on the scale, click on '''TARE'''.

Pour 100 ml of Compound '''A-2'''.

|-
|| 09:29
|| Scale reads '''85 g.'''

Note this value.

|-
||09:35
|| Experimental results are tabulated on this slide.

Calculate densities using the formula: Density=mass/volume

|-
|| 09:47
|| Observe that density of '''Compound A-1''' is more than '''Compound A-2.'''

Therefore '''Compound A-1''' contains the '''preservative.'''

|-
|| 09:57
|| Let's summarize.

In this tutorial we have learnt to measure,

Densities of silver, rhodium and platinum using Archimedes' Principle.

|-
|| 10:09
|| Densities of liquids with unknown concentration.

|-
|| 10:14
|| For the assignment.

Open default lab setup window.

|-
|| 10:19
|| You will find many stock solutions.

Find density for a few solutions of your choice.

|-
|| 10:28
|| The video at the following link summarizes the Spoken Tutorial project.

Please download and watch it.

|-
||10:35
|| The '''Spoken Tutorial Project '''team: conducts workshops using spoken tutorials and

gives certificates on passing online tests.

For more details, please write to us.

|-
||10:48
|| Please post your timed queries in this forum.

|-
|| 10:52
|| Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.

More information on this mission is available at this link.

|-
|| 11:03
|| This tutorial is contributed by Snehalatha Kaliappan and Madhuri Ganapathi from IIT-Bombay.

Thank you for joining
|}

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

PoojaMoolya: Created page with "{|border=1 ||'''Time''' ||'''Narration''' |- ||00:01 || Welcome to this tutorial on '''Density of Metals and Liquids''' using '''Vlabs'''. |- || 00:08 || In this tutori..."