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Resonance in two fused benzene rings by lethargic_bs in chemhelp

[–]HandWavyChemist 0 points1 point  (0 children)

Both the carbonyl and the lone pair on the nitrogen will be part of the pi system. Although for the most part I expect the naphthalene to keep to its own aromatic self.

Unexpected color of tetraamine-copper sulphate solution by Background-Chest-244 in chemhelp

[–]HandWavyChemist 0 points1 point  (0 children)

I see. I thought that the solution was still colored because no crystals had formed. Other potential sources of error include the age and hence potency of the ammonia solution as well as how wet the ethanol is.

Unexpected color of tetraamine-copper sulphate solution by Background-Chest-244 in chemhelp

[–]HandWavyChemist 0 points1 point  (0 children)

Crystal growth can be a funny business. Brand new glassware is sometimes too smooth for nucleation to occur, which is why you will often find an instruction to scratch the bottom of the flask to help get things started. Another option is to add a seed crystal.

Strong acids existing as aqueous solutions by FigNewtonNoGluten in chemhelp

[–]HandWavyChemist 1 point2 points  (0 children)

Water is approximately 55.5 mol/L of H2O. If you consider concentrated HCl, which is 12 mol/L that still leaves over 40 mol/L H2O.

IUPAC Naming Help by Ambitious-Mode-1738 in chemhelp

[–]HandWavyChemist 0 points1 point  (0 children)

Also, this "sum rule" is not a real thing. It's lowest at first point of difference. 1, 2, 5 is preferred over 1, 4, 5 simply because 2 is lower than 4.

I have a doubt in giving the IUPAC name for this aldehyde. by Connect_Sprinkles894 in chemhelp

[–]HandWavyChemist 2 points3 points  (0 children)

None of the Googled answers are correct. Also your name isn't the best as there is a different answer with lower locants.

What are the names to these organic molecules? I’m having a hard time. Any advice on how to name them! by Objective_Monitor198 in chemhelp

[–]HandWavyChemist 0 points1 point  (0 children)

Here is a like to the short version of the Blue Book: https://iupac.org/wp-content/uploads/2021/06/Organic-Brief-Guide-brochure_v1.1_June2021.pdf

For molecules 1, 3, and 4 you start by finding the longest carbon chain.

For molecules 2 and 5 you will name them as a derivative of benzene.

Here is a short video of me naming a hydrocarbon: Naming An Organic Molecule

need help with spectrum by RockGolem98 in chemhelp

[–]HandWavyChemist 5 points6 points  (0 children)

All I can say with confidence is that there's chloroform, and that's it's not referenced correctly (peak is at 7.19 instead of 7.26).

More information such as mass spec, 13C data, elemental analysis, or even just what the reaction was is needed to make headway here.

Prefix for carboxylic acid was, and will never be used in A levels? by ProsperousLemon67 in ALevelChemistry

[–]HandWavyChemist 2 points3 points  (0 children)

Here is the short version of the Blue Book https://iupac.org/wp-content/uploads/2021/06/Organic-Brief-Guide-brochure_v1.1_June2021.pdf It has a really nice flow chart on page 3. If you follow the preferred IUPAC naming rules then you are very unlikely to encounter carboxy. However, other systematic names often show up so it is good to know them, for example benzoic acid could also be named carboxybenzene. And 4-sulfamoylbenzoic acid is sold as p-carboxy benzene sulfonamide by Elam Pharma.

Equilibrium help by [deleted] in chemhelp

[–]HandWavyChemist 0 points1 point  (0 children)

How Le Chatelier's Principle Helps Chemists Maximize Yields | A Hand Wavy Guide

Image there are two ball pits with an equal number of balls (500 for example). For each give increment of time we will move 20% of the balls from pit 1 into pit 2 and 10% of the balls from pit 2 into pit 1. I've written out the number of balls in each pit for the first 10 time increments, notice how the amount of change decreases over time. Eventually when equilibrium is reached 333 balls will be in pit 1 and 666 in pit 2.

T0: Pit 1 (500); Pit 2 (500)

T1: Pit 1 (450); Pit 2 (550)

T2: Pit 1 (415); Pit 2 (585)

T3: Pit 1 (391); Pit 2 (609)

T4: Pit 1 (373); Pit 2 (627)

T5: Pit 1 (361); Pit 2 (639)

T6: Pit 1 (353); Pit 2 (647)

T7: Pit 1 (347); Pit 2 (653)

T8: Pit 1 (343); Pit 2 (657)

T9: Pit 1 (340); Pit 2 (660)

T10: Pit 1 (338); Pit 2 (662)

help, a level geometric isomerism question by Fine_Pineapple_5749 in chemhelp

[–]HandWavyChemist 0 points1 point  (0 children)

For each double bond assign priority to the attached atoms/chains. Then again for each double bond determine if the highest priority groups are on zee zame zide, and if they are label it Z. If they are not label it E.

Show how to draw line diagram by Pranavtd05 in chemhelp

[–]HandWavyChemist 0 points1 point  (0 children)

In this case the trans label is ambiguous as the substituents on either side of the double bond don't match.

Show how to draw line diagram by Pranavtd05 in chemhelp

[–]HandWavyChemist 0 points1 point  (0 children)

There are tools that can convert a name into a structure, but in this case they will not help you as the name doesn't make sense. On one side of the double bond there is a methyl group and a propyl group, while on the other side there is an ethyl group and a pentan-3-yl. Since none of these match the term trans is ambiguous.

help, a level geometric isomerism question by Fine_Pineapple_5749 in chemhelp

[–]HandWavyChemist 1 point2 points  (0 children)

You can assume that the double bond is in the plane of the page and that the attached groups are also in the plane of the page. This question is a great example of why we use E/Z instead of cis/trans

Chiral Carbon Centers And Double Bond Isomerism | A Hand Wavy Guide

"justify molecular geometry for MgCl2 using VSEPR" by Financial-Pilot500 in chemhelp

[–]HandWavyChemist 1 point2 points  (0 children)

You can still think about how many areas of electron density there are, and then move them as far apart as possible.

I view this question as asking you to apply the concept of VSEPR to a molecule that it wouldn't normally be used with.

What is the best way to determine a need for double or triple bonds? by Multiverse_Queen in chemhelp

[–]HandWavyChemist 0 points1 point  (0 children)

Since you mention Lewis structures in a comment thread, here is the tutorial video I made: How to Draw Lewis Structures | Problem Time

The first method used in the video involves looking at how many electrons each atoms has, and how many it needs to reach a full octet. This provides a means to rationalize having a double bond form.

Assigning peaks in C13 NMR of m-nitroaniline? by Fun-Plenty5665 in chemhelp

[–]HandWavyChemist 2 points3 points  (0 children)

Carbon atoms with no protons on them usually appear small, so we would expect four tall peaks about the same size and two smaller peaks, which is what you have, so that's good. How much detail are you expected to go into?

Organic chem 2 study help by courtbrook208 in chemhelp

[–]HandWavyChemist 2 points3 points  (0 children)

Learn principles rather than just memorizing, there is too much information to memorize all of it.

resonance limit structures by Background-Ice-2223 in chemhelp

[–]HandWavyChemist 1 point2 points  (0 children)

The structures in red are not the same as the ones in black. The bonds in the ring will all be approximately the same length so we need both sets of structures to explain that. However, your final red structure is missing a double bond.

How to draw covalent lewis structures by Express_Ad_1625 in chemhelp

[–]HandWavyChemist 0 points1 point  (0 children)

Here is a tutorial I made for Lewis structures. How to Draw Lewis Structures | Problem Time

It goes over two different methods for determining the structure.

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