MediumChemistryHigh School (11–12)Redox Reactions › Oxidation Number and Types of Redox ReactionsConceptualA-LevelAPIB
Name the kind of reaction, and say whether it is a redox reaction: (a) 2Mg + O₂ → 2MgO; (b) 2HgO →…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Name the kind of reaction, and say whether it is a redox reaction: (a) ; (b) ; (c) ; (d) ; (e) ; (f) .
Need a reminder? The key ideaShow
Five kinds: combination, decomposition, displacement, disproportionation (one element goes up and down) and comproportionation (two states of one element become one). If no oxidation number changes, it is not a redox reaction.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a). Two substances join, and magnesium goes . A combination, and redox.
Step 2. (b). One compound breaks up. Mercury goes and oxygen . A decomposition, and redox.
Step 3. (c). Iron takes the place of copper. Iron goes and copper . A displacement, and redox.
Step 4. (d). Oxygen goes from to and to 0. A disproportionation, and redox.
Step 5. (e). Nitrogen is and in the reactant, and both become . A comproportionation, and redox.
Step 6. (f). Calcium , carbon and oxygen all stay the same. A decomposition, but not redox.
Answer: combination, decomposition, displacement, disproportionation and comproportionation are redox. (f) is a decomposition with no change in oxidation numbers.
Discussion (0)
Log in to join the discussion.
Loading…