1. Which samples are definitely polar? How do you know?
2. Which samples are definitely non-polar? How do you know?
3. From the data, what can you conclude about the polarity of ethanol?
4. Would you expect ethanol to dissolve in water? How about in hexane?
5. Classify the following as non-polar or polar molecules. Then, predict their solubility in each solvent.
Type of Molecule
|
Solubility in Water
|
Solubility in Hexane
| |
NH3
| |||
I2
| |||
HCl
|
6. Why do ionic materials dissolve so well in water, but not in hexane?
Enrichment: Atmospheric gases such as
oxygen, nitrogen and carbon dioxide are capable of dissolving in water.
Make a prediction regarding how much you expect these gases to dissolve
based on their polarity. See if you can find or think of at least one
reason why oxygen and carbon dioxide need to be able to dissolve in
water for aquatic life to flourish.
10.2 Section
What things made a significant difference in how quickly the KClO3 dissolved. If you wanted to get something to dissolve quickly, what things can you do in order to make it happen. The more important question is: Why does this happen at the particle level, what does particle collisions and attractions have to do with this? Does surface area relate to this at all, and if it does what can you do to change that variable to make it happen quicker.
Describe how the terms unsaturated, saturated, and super saturated apply to the experiment. At what point was the solution saturated, and at what point was it unsaturated. I will tell you now that with potassium chlorate in this experiment, you never formed a supersaturated solution, it precipitated out before that happened.
ENRICHMENT: Find out how rock candy is made. I am sure you can find a recipe very easily, but I want you to apply this to chemistry using the vocabulary we have learned. This is a little more difficult task than just finding the recipe. If you want make it, try it, it is delicious.
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