Last modified: Wed 12/31/1969 06:00:00 pm
BCE

Answer all of the questions below. If you do not know an answer enter CNA. However, it will help me the most if you answer each question with your best intuition/idea about what would be a reasonable answer.

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View the movie on the right and answer Questions 1 - 4:

1. Identify the chemical species present in the solution poured into the beaker on the left in the movie.

2. Identify the chemical species present in the solution poured into the beaker on the right in the movie.

3. What evidence is there for a chemical reaction when the two solutions are mixed?

 

 

4. Write the balanced net ionic equation that represents the chemical reaction between Fe(NO3)3(aq) and KSCN(aq). Identify the color of each of the species in the net ionic equation.

net ionic equation
+
--->

color

 

5. In the movie equal samples of the reaction mixture are added to two petri dishes.

To the solution in the petri dish on the left several drops of Fe3+ are added.

Describe what you observe when the Fe3+ is added to the solution in the petri dish.

6. What chemical species must have been formed to account for your observation?

7. What chemical species did the Fe3+, that was added to the solution in the petri dish, react with to produce the change you observed?

8. In the next movie equal samples of the reaction mixture were added to two petri dishes. To the petri dish on the left several drops of Fe3+ have been added.

To the solution in the petri dish on the right several drops of SCN- are added.

Describe what you observe when the SCN- is added to the solution in the petri dish.

9. What chemical species must have been formed to account for your observation?

10. What chemical species did the SCN-, that was added to the solution in the petri dish, react with to produce the change you observed?

11. After viewing the three clips what evidence (if any) is there that the following species are in solution after mixing the Fe(NO3)3(aq) and KSCN(aq).

a) Fe3+ (what evidence do you have that there is some Fe3+ in the solution prepared by mixing Fe(NO3)3(aq) and KSCN(aq))

b) SCN- (what evidence do you have that there is some SCN-in the solution prepared by mixing Fe(NO3)3(aq) and KSCN(aq))

c) FeSCN2+

12. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

13. If there is one question you would like to have answered in lecture, what would that question be?