ITSH2406
iLS Activity 1 (10 items x 10 points)
Chemical Bonding – Digital Activity
Directions:
1) Access the Ionic and Covalent virtual laboratory through the following link:
http://phet.colorado.edu/en/simulation/sugar-and-salt-solutions
2) Conduct the experiments and answer the questions that follow.
Part A
In the Macro tab:
1. Fill the container with water.
2. Place the battery-bulb set-up in the water. (Do not submerge the battery in water)
3. Choose sugar as a solute. Put a little at a time and observe the light emitted by the
bulb.
4. Decrease the volume of the liquid by evaporating the water and observe changes
in the bulb.
5. Repeat the steps above but choose salt as the solute.
6. Complete the table:
Light emission Light emission
Solute: SALT
(2L of water) (250mL)
Image
Description
Light emission Light emission
Solute: SUGAR
(2L of water) (250mL)
Image
Description
7. Answer the following questions:
a. Differentiate the light bulb emissions when the different solutes are used.
b. What is the effect of decreasing the volume of water on the intensity of the
light source?
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ITSH2406
Part B
In the Micro tab:
1) Fill the container with water.
2) Choose a small amount of salt as a solute and observe the atoms when in contact with
water.
3) Evaporate the water until none is left in the container and observe the behavior of
the atoms.
4) Repeat the steps using sugar as the solute.
5) Repeat the steps above but choose salt as the solute.
6) Complete the table:
When dispersed in When all water is
Solute: SALT
water evaporated
Image
Description
When dispersed in When all water is
Solute: SUGAR
water evaporated
Image
Description
7) Answer the following questions:
a. What is the difference between salt and sugar atoms when dispersed in water?
b. Compare the salt atoms when in water and without water.
c. What property differentiates the behavior of salt and sugar in water? What does
this explain about the bonds of their atoms?
Reference:
PHET Interactive Simulations. (n.d.). PhET. https://phet.colorado.edu/en/activities/3751
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Scoring Guide for Parts A and B (Table)
The student accomplished the activity, provided the
required screenshots as proof, and described the pictures 25 pts
accurately.
The student accomplished the activity and provided the
required screenshots as proof but described the pictures 15 pts
inaccurately.
The student has accomplished the activity, has incomplete
entries in the table, and has no screenshots submitted as 8 pts
proof.
The student has no entries at all. 0 pts
Scoring Guide for Parts A and B (Questions per item)
The student exhibits a high level of understanding of the
results of the experiment by giving correct descriptions 10 pts
and explanations.
The student exhibits an adequate understanding of the
results of the experiment by giving mostly correct 7 pts
descriptions and explanations.
The student exhibits an inadequate understanding of the
results of the experiment by giving mostly incorrect 3 pts
descriptions and explanations.
The student has no answers at all. 0 pts
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