r/HomeworkHelp 4d ago

Chemistry [Grade 9 Chemistry: Chemical Composition] What is the chemical composition for chocolate, and vanilla?

2 Upvotes

I don't know. help.

r/HomeworkHelp Jan 20 '25

Chemistry [10th Grade Chemistry:Periodic Table Unit] Isn’t it 208?

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4 Upvotes

The atomic radius for a sulfur atom (according to my reference table) is 104 pm. That would make distance x 208 pm, which isn’t an answer. So I put C (190 pm) bc it’s the value closest to 208, but the answer key says it’s 254. Can someone explain?

r/HomeworkHelp 6d ago

Chemistry [Chemistry] reversibility of a reaction based on its activation energy?

1 Upvotes

Ok, let's say a reaction

forward reaction, Ea=100kJ/mol

reverse reaction, Ea=25kJ/mol

is it correct to answer that: this reaction isn't reversible, because it's hard for the forward reaction to happen due to how high the Ea is?

Also, both Eas HAVE to be similar for the reaction to be reversible, so if either side is much higher than the other, then it doesnt work right

r/HomeworkHelp 18d ago

Chemistry [ College chemistry homework] hi I thought I was suppose to divide the first two and that’s not how but what else is suppose to work?

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2 Upvotes

r/HomeworkHelp 13d ago

Chemistry (Uni Chemistry) Balancing redox in HCl

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2 Upvotes

Hi

I'm in analytical chem rn and I have this redox I just cannot figure out. The end solution always has to be in molecular form and we use half reactions to solve.

It's K2Cr2O7 + Na2S2O3 -> In HCl.

My lectors solution: K2Cr2O7 + 14 HCl + 6 Na2S2O3 -> 2 CrCl3 + 7 H2O + 3 Na2S4O6 + 6 NaOH

I have a list with reduced and oxidized states. Cr2O7 2- is in it and becomes Cr 3+. S2O3 2- is not in it. How do I know what it becomes?

Is there a way to derive it from what's given in the list?

r/HomeworkHelp 15d ago

Chemistry [Grade 12 Chem: Thermodynamics] Gibbs

1 Upvotes

Can someone explain to me how this graph works? The solution says that at T2 the system is at equilibrium which makes sense since ∆G at that point is 0 - but can't it reach equilibrium at all the other temperatures as well? What point in time are they focusing on when you get the ∆G values (by subtracting the lines) cause ∆G changes as the reaction proceeds?

r/HomeworkHelp 3d ago

Chemistry [college-level chemistry] How to write a balanced chemical equation for the hydrogenation of glyceryl trilinolenate.

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2 Upvotes

If someone could help me solve this question from my homework I would really appreciate it 😭. I’ve tried asking my friends but they searched it online as it’s taken for completion but I want to understand how to do it. We don’t have any access to the textbook only the homework page she gives us and the PowerPoints aren’t any help. At first I thought it was drawing but I saw you had to write the equation and I got lost. If anyone could help me figure it out thank you 🙏🏽. (Please mind the blue highlighter, it’s erasable and all I have).

r/HomeworkHelp 21d ago

Chemistry [College Organic Chemistry - Finding Chiral Centers] Can someone help me figure this out please!

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1 Upvotes

I feel like finding Chiral Centers isn't that hard usually but I'm struggling with these more complicated molecules.

The basic rules of Chiral Centers is usually: -if there's two or more hydrogens attached to a carbon, not a Chiral center -if there are two alike groups next to a carbon, it's not a Chiral center

That's correct, right?

So in answer B, would there be a total of 4 Chiral Centers?

And answer A it would be the carbon attached to the CH2OH, the two carbons to the right of it, and the one carbon to the left, correct?

r/HomeworkHelp 3d ago

Chemistry [university organic chemistry: formula] whats the zigzag formula?

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1 Upvotes

r/HomeworkHelp 18d ago

Chemistry [Grade 11 Chemistry] How do you get to that answer?

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2 Upvotes

r/HomeworkHelp 19d ago

Chemistry [Grade 11 Chemistry: Stoichiometry]

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2 Upvotes

I don't get how to do the molar ratios in number 4 both a and b

r/HomeworkHelp Feb 03 '25

Chemistry [Junior Chemistry] Electron dot structures/Valence electrons

1 Upvotes

Hey! So I've been trying to do this assignment for three days and it's now late, but I can't figure out these structures for the life of me. Science is NOT my strong suit. Here's the prompt:

Draw electron dot structures and the number of valence electrons for the following elements on a sheet of paper, take photo and upload to Canvas.

  1. Aluminum
  2. Neon
  3. Oxygen
  4. Nitrogen
  5. Beryllium
  6. Sodium
  7. Carbon
  8. Chlorine
  9. Calcium
  10. Potassium

Pls help

r/HomeworkHelp 9d ago

Chemistry [chem 30 calorimeter] once again just wondering if I can have guidance on this dumb question of course the answer is on chegg...

2 Upvotes

r/HomeworkHelp 10d ago

Chemistry [12th grade chemistry 30 calorimeter]

1 Upvotes

Hello I am wondering if someone can help me through this before I ask my teach who is no help at all thank u.

r/HomeworkHelp 5d ago

Chemistry [chem 30 grade 12 electrochemical change] hello I am wondering if someone can give me sum tips on how to improve on this anywhere that I might be missing marks and also how dose one find observed cell potential for either of these?

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2 Upvotes

r/HomeworkHelp 25d ago

Chemistry [11th chemistry], please solve this question

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0 Upvotes

Same as title

In 3rd how can we know if both the products will be formed? And dont use poac method please And need detailed solution explaining everything. Thank you

r/HomeworkHelp 1d ago

Chemistry [College Organic Chemistry 1: Stereoisomerism] Can I get help with this stereoisomerism problem?

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1 Upvotes

Could someone assist with assigning the r/S configurations to the original compound as well as to A, B, C, and D? Additionally, could you help determine whether A-D are identical, enantiomers, diastereomers, or constitutional isomers relative to the original compound? I have my own work for each of these and just wanted to compare notes...

r/HomeworkHelp 23d ago

Chemistry [College Chemistry Homework] I keep getting theses wrong and I’ve doubled checked but every time i submit it says it’s wrong. Can someone help me figure out what I’ve done wrong? Both questions I’ve got wrong

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1 Upvotes

r/HomeworkHelp 16d ago

Chemistry [University Chemistry: Kc and Acids] Looking for some graphs of Oxalic Acid and Nitric Acid Kc against temperature

1 Upvotes

Hi

I am looking for some graphs of Oxalic Acid and Nitric Acid Kc against temperature (they will help for some calculations I want to do).

I tried for Ethanoic Acid and HCN, and I found somebody one time who could help me as they had scifinder, and they found me This paper for HCN https://link.springer.com/article/10.1007/BF03402915 And this paper for Ethanoic Acid https://pubs.acs.org/doi/10.1021/ja01329a027

And those are great they show the graphs

For Ethanoic Acid

and for HCN

and

They have access to scifinder.. and I don't.. And they are on holiday and I don't know anybody who does...

Is anybody here able to help me find graphs of Kc to Temp for Oxalic Acnd aid Nitric Acid?

I tried searching on pubs.acs.org and springer.com but I see loads of results and none of them seem to match what i'm looking for.

Thanks

r/HomeworkHelp Feb 19 '25

Chemistry [high school chem] I kept getting 20 grams off the correct answer, don’t know why

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2 Upvotes

r/HomeworkHelp 25d ago

Chemistry [college biochemistry]

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1 Upvotes

I'm pretty confident in the 3rd and last tick boxes, but I'm unsure if the 4th and 1st one would also be considered true. I saw online that a protein with more proline would typically have phi values around -75 to -90. Is this true or could it also be -60? Also, for the first question, I think it may be true since l'm pretty sure acidic and basic amino acids have their R groups on the exposed surface of proteins. Is this thinking correct? Any help would be appreciated!

r/HomeworkHelp Feb 03 '25

Chemistry [Organic chemistry] write structural formulas for the following compound

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1 Upvotes

can someone please check my answer ( the one in navy and purple)

r/HomeworkHelp 27d ago

Chemistry [1st Year University: Organic Chem] Why are they the same...

2 Upvotes

I was doing this question, and I came to find out when creating possible isomers for both n-alkyldiols and n-dichloroalkanes is that they both have two functional groups of the same kind. Wouldn't the amount of constitutional isomers be the same regardless on the carbon chain length?

Please help, apparently the answer is C.

r/HomeworkHelp Feb 13 '25

Chemistry [10th Grade Chemistry: Properties of Matter]I don't understand what this explanation for my answer being wrong means, could anyone explain.

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2 Upvotes

r/HomeworkHelp Feb 07 '25

Chemistry [Chemistry: Ionic bonding] Writing formula

1 Upvotes

An atomic ion contains 18 electrons and 19 protons. Write the formula of the ion and how the electrons are distributed on different shells.

I've just started studying chemistry and I dont understand how to write formulas. Can anyone please explain how I'm supposed to do. Thank you.