Give the names for the following five substances: K_2S_2O_8 Na_2S_O_3 SO_4^2- I_

Question

Give the names for the following five substances: K_2S_2O_8 Na_2S_O_3 SO_4^2- I_2 I^- How important are the sodium and potassium ions in the reactions? Analogous to Bronsted-Lowry acids where a proton is transferred, electrons can be transferred between species in a solution. This transfer of electrons is called oxidation and reduction. Define the terms oxidation and reduction. Which of the following is an oxidation reaction? 2I^- rightarrow I2 + 2e^- I_2 + 2e^- rightarrow 2I^- What experimental conditions will be varied in an attempt to affect the rate of the clock reaction? Nicholas is 5 and Briana is 3.1 asked Nicholas to build a Lego tower 10 blocks tall. For that, I promise him an ice cream cone. The Legos are on one side of the room and the tower base is on the other. Nicholas decides to build the tower one block at a time. So, he gets the first block, plants it on the base, and goes for another block. Meanwhile, I told Briana that I'd give her a cookie if she would bring me 5 blocks from the tower, one block at a time. She moves just as fast as Nicholas. Explain how long it would take Nicholas to get his ice cream cone based on the number of blocks I ask Briana to bring me.

Explanation / Answer

1) Name:

a) K2S2O8 : Potassium Persulfate

b) Na2S2O3 : Sodium thiosulfate

c) SO4-2: Sulfate ion

d) I2 : Iodine

e) I- : Iodide ion

2) Sodium and potassium ions are spectator ions only.

3) Oxidation : The loss of electron or loss of hydrogen or gain of oxygen is oxidation

Reduction : The gain of electron or gain of hydrogen or loss of oxygen is reduction

4) 2I- --> I2 + 2e

There is loss of electron so this is oxidation

I2 + 2e ---> 2I-

There is gain of electron so this is reduction

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