72017 \"nam Experimen #2: \"Corrosive action and protection\" 6. Sketch the 2 na

Question

72017 "nam Experimen #2: "Corrosive action and protection" 6. Sketch the 2 nails, evidence of rust/corrosion, and any Experiment #16: Oxidation and Reduction Processes 2d2 colorod regions within your Petri dish. (Use colorod pencils or pens if you have them.) Clearly label which mctals are corroded 7· Locate and label de metal ions present in each region of the Petri dish. (In this esperiment, Fe" is "resty" and Zn is white. Pink shows where reduction occurs) 8. Look at the nail wrapped with a zinc strip. Which mectal is dask rust oxidized? Which motal is not? Mctal oxidizod Metal not osidined 9 Write the redox reaction that occurs between zinc and oxygen 10. Write the redox reaction that occurs between iroe and oxygen 11. Identify the activity (case of oxidization) of each of the mctals in the petri dish (lcast active metal (most active metal) 12. Given what you leamod in this experiment, if you were going to bury an iron pipe underground, how might you prevent it from rusting? ank the met

Explanation / Answer

8. Iron metal is oxidized, zinc is not oxidized.

9. 2 Zn + O2 ----->2 ZnO

2 Zn ----------> 2 Zn(2+) +4e-

O2 + 4e- --------> 2O(2-)

10. 2Fe + O2 --------->2FeO

2Fe ------->2 Fe(2+) + 4 e-

O2 + 2e- --------> 2O(2-)

11. Fe is highly active metal I,e easily oxidisable

Zn is less active when compared to iron I,e not easily oxidisable

12. By zinc electroplating on iron, rusting of iron can be prevented.

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