Module 3
1. Module 3
1.16. Page 3
Module 3—Electrochemical Reactions
Lesson 3 Lab: Testing Predictions
Background Information
In this lesson you learned to predict redox reactions using the five-step method listed on page 578 of the textbook. Are the predictions made using this method supported by empirical evidence? Having a method to predict and explain changes in metals, metal ions, or other substances in chemical systems would have great value when considering chemical systems that might exist beyond the ones you construct in a laboratory.
For instance, consider the equipment used in the extraction of bitumen in Alberta's oil sands operation. Electrochemical changes may be suspected in cases of metal fatigue in the equipment. Could the five-step method be used to identify alternative metals for use in this equipment?
In the Pre-Lab for this investigation you will design an experiment to test predictions using the following combinations of reactants:
System |
Reactant 1 |
Reactant 2 |
1
|
HCl(aq) |
Cu(s) |
2
|
HCl(aq) |
Mg(s) |
3
|
Cu(NO3)2(aq) |
Sn(s) |
4 |
NaOH(aq) |
I2(aq)
|
5 |
Cu(NO3)2(aq) |
Mg(s)
|
As you design your experiment, make sure you consider safety aspects when suggesting how these substances should be manipulated and how waste from the reactions should be disposed of.
As you saw in SC 2, it is important that you be able to use diagnostic tests, detect colour changes, measure changes to pH, or identify other evidence of reaction. The evidence of reaction that you predict and make certain you observe will allow you to form a conclusion about the method you are testing in this investigation.
Retrieve the Module 3: Lesson 3 Assignment that you saved to your compluter earlier in this lesson. Complete the Pre-Lab section of the Assignment now. You will record your observations in your Assignment document as you view the virtual investigation, and then you will complete the Analysis section.
View the virtual investigation “Testing Predictions for Redox Reactions.”
Module 3: Lesson 3 Assignment
If you have not already done so, retrieve the Module 3: Lesson 3 Assignment that you saved to your compluter earlier in this lesson. Complete the Assignment. Save your work in your course folder. You will receive instructions later in this lesson on when to submit your Assignment to your teacher.