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51
Undergraduate General Chemistry Forum / Re: Redox
« Last post by Hunter2 on March 27, 2025, 03:20:09 PM »
Recipe
1. Find the redox pairs
CrO42- / Cr3+  I-/I2
2. Find the condition acidic, neutral or alcaline
If oxygen is involved in acidic reduction add H+ and get H2O, for oxidation vise versa, if neutral or alcaline reduction add water and get OH-.
3. Develop the equation
4. Balance the charges with electrons.
5. Built lowest common multiple of electrons and multiply accordingly
6. Add both equation and eliminate the electrons, H+ , H2O , OH- if necessary.
The redox equation is finished
7. Add the spectator ions, if necessary.
52
Undergraduate General Chemistry Forum / Redox
« Last post by ve_90 on March 27, 2025, 02:06:33 PM »
I need to balance this reaction using the oxidation number change method, which I think is preferable to the half-reaction method, since the reaction is written in molecular form.
K2CrO4 + KI + HCl → CrCl3 + KCl + I2 + H2O
I know that chromium is reduced (from +6 to +3) while iodine is oxidized (from -1 to 0).
I also know that I need to balance the iodine atoms by placing a 2 in front of KI on the reactant side.
The balanced reaction, according to the book solution, is as follows:
2K2CrO4+ 6KI + 16HCl → 2CrCl3 + 10KCl + 3I2 + 8H2O.
I can't understand how it was solved: can someone help me?
53
Free Chemistry Advertising, and other links offsite / Professional do polypeptide, steroid hormones, steroid products
« Last post by Daisy LI on March 27, 2025, 02:24:50 AM »
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54
Organic Chemistry Forum for Graduate Students and Professionals / Re: Chemicals available free for NC area chemistry professors
« Last post by praise on March 26, 2025, 11:27:50 PM »
please check my email!
55
Organic Chemistry Forum / Re: Addition of HCl to 2-methyl-1,3-cyclohexadiene
« Last post by Borek on March 25, 2025, 05:57:51 PM »
Note: you can post molecules using SMILES (see https://www.chemicalforums.com/index.php?topic=59314.0)
56
Organic Chemistry Forum / Re: Addition of HCl to 2-methyl-1,3-cyclohexadiene
« Last post by Meter on March 25, 2025, 03:30:38 AM »
You need to draw your attempts. No one is going to decipher your text.
57
Organic Chemistry Forum / Re: Feasibility of other products from this reaction?
« Last post by Meter on March 25, 2025, 03:28:52 AM »
This is called a Cope rearrangement and can happen for 1,5-dienes when heated. There are no conditions for cycloaddition as far as I can see.
58
High School Chemistry Forum / Re: IUPAC name (cycloalkene)
« Last post by Hunter2 on March 23, 2025, 02:56:08 PM »
First it's not a cyclohexene, it's a cyclopentene.
The 1 at the doublebond is not necessary, because if the double bond is at other position the numbers for the substituents will also change.

https://pubchem.ncbi.nlm.nih.gov/compound/3S_-3-Chloro-4-methylcyclopentene
59
High School Chemistry Forum / Re: Crystalizing Ammonium Nitrate
« Last post by Working_Mud7894 on March 23, 2025, 02:38:27 PM »
Thank you all for the responses. I am aware of the dangers. I will make sure I won't heat the solid substance.

I heated the solution till it is concentrated and then left to cool. I have attached the picture. It is hard solid disk there. I will try again with slow cooling.

60
High School Chemistry Forum / Re: Crystalizing Ammonium Nitrate
« Last post by Hunter2 on March 23, 2025, 01:30:04 PM »
Quote
1. Dissolved the ammonium nitrate fertilizer in water

I think to use a fertilizer is anyway no good idea, because it's a mixture of different compounds. To produce nice crystals use the clean product.
As already mentioned ammonium nitrate is a dangerous  compound.
It can explode by itself.
Last one happened in Beirut.

https://www.google.com/url?sa=t&source=web&cd=&ved=2ahUKEwiM7Mbz3KCMAxUb7AIHHX1NEqwQwqsBegQIChAF&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DBJmOPnRAJoo&usg=AOvVaw00A_wYKKGB356FXxEEVDqD&opi=89978449
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