Reaction Products Investigation

What do you think you will see in your evaporation dish tomorrow? How will you determine if the white precipitate is baking soda or some other substance?

Chemical reaction investigation

Where did the bubbles come from in cups 1 & 3?  What was the solid that formed in cup 1?

Fizzing Bags

What differences and similarities did you observe between the reaction of calcium chloride/baking soda and citric acid/baking soda?

Concentration Lab

Why was it important to take repeated measurements of our solutions?

KoolAid Recipe?

Were all the solutions we made today the same?  Was the concentration of each solution the same?  Were some solutions more diluted than others?  How could you tell?  What was the solvent and solute?    

Suspensions, Colloids and Solutions

Someone emailed me tonight looking for clarification on the difference between a colloid and a suspension. This video goes into more depth than you are expected to know, but it is very informative.

For the test you should be able to give examples of each. You should also know the main differences between them. Both are composed of larger molecules than a solution.

Colloids
composed of smaller molecules
usually do not separate on standing
can not be separated by filtration
Example: Fog

Suspensions
composed of larger molecules
separate on standing
can be separated by filtration  
Example: Blood

Separation Challenge!!!

What physical separation techniques did you use to separate the sand, rock, salt, iron mixture? What challenges did you run into today? If you were to do this again, would you do anything differently? What other mixtures could you separate with the techniques that you used today? What solution did you make today?  What was the solute and solvent?

Separation Challenge Handout

Rainbow Lab

Great job today!!! Can you tell me what solutions can be made of? What is a solute? What is a solvent? Did you observe a chemical or physical change today?