IB Chemistry Topic 9 Redox processes Topic 9.1 Oxidation and reduction SL

IB Chemistry Topic 9 Redox processes Topic 9.1 Oxidation and reduction SL
Covers oxidation numbers, redox half equations, and titrations.

Full set of resources for topic 9 including PPTs and quizzes:

0:00 Thermite reaction redox reaction
0:58 Redox calculations with oxidation numbers
7:49 Balancing redox half equations
Updated steps to balance redox reactions:
1. Oxidation states
2. Balance elements except for H/O
3. Balance O with H2O
4. Balance H with H+ (acidic solutions)
5. Balance charge by adding electrons
10:23 Combining half equations
11:32 Titration redox reactions
12:52 The Winkler method and Biological Oxygen Demand (BOD)

9.1 Oxidation and reduction SL
• Oxidation and reduction can be considered in terms of oxygen gain/hydrogen loss, electron transfer or change in oxidation number.
• An oxidizing agent is reduced and a reducing agent is oxidized.
• Variable oxidation numbers exist for transition metals and for most main-group non-metals.
• The activity series ranks metals according to the ease with which they undergo oxidation.
• The Winkler Method can be used to measure biochemical oxygen demand (BOD), used as a measure of the degree of pollution in a water sample.
• Deduction of the oxidation states of an atom in an ion or a compound.
• Deduction of the name of a transition metal compound from a given formula, applying oxidation numbers represented by Roman numerals.
• Identification of the species oxidized and reduced and the oxidizing and reducing agents, in redox reactions.
• Deduction of redox reactions using half-equations in acidic or neutral solutions.
• Deduction of the feasibility of a redox reaction from the activity series or reaction data.
• Solution of a range of redox titration problems.
• Application of the Winkler Method to calculate BOD.

Connect with me:

[AndrewWeng]

Updated steps to balance redox reactions:
1. Oxidation states
2. Balance elements except for H/O
3. Balance O with H2O
4. Balance H with H+ (acidic solutions)
5. Balance charge by adding electrons

[naildesignsisbeauty]

For problem 2, can you please slow down and explain a bit clearer about the H+ and so? Would have been much clearer if you slowed down and explained it a bit more.

[halitozgur]

You are not explaining things very clearly, the only reason why I watch these videos is because of the information on the slides.

[naildesignsisbeauty]

Same for problem 2 please explain the oxidation states instead of just writing it down and assuming the +12 and +6 is understood!

[kosovarjakongetarja]

do I look like a robot who understands x10 speed writings????

[karamalamin]

4:04, if the q is to determine whether they are oxidizing/reducing agents shouldnt mg be a reducing agent if it now loses electrons?

[aarnihilden]

16:40 why is it for every mole of S2O3 used, 1/4 moles of O2 will be demanded? I get that if S2O3 has twice the moles I2 has then the moles of O3 demanded would be twice how much I2 is used. But then, converting O3 to O2, the moles will be 2x0.75=2x3/4=6/4=1 1/2

[setsunart]

13:06 what is mean by shaking with air