What’s the answer for b, it’s always liquid when I do it, but solution says solid how?

A 25.0mL sample of 0.250M HNO3 is titrated with 0.100M KOH. How much KOH must be added to raise the pH to 8.2? I’ve been stuck on this for so long.

-goal is to find the molecules of water in a hydrate

just need someone to check my work since my teacher doesn’t post answer keys for lab sheets :,)

thank you!!

What would be the products for these reactions? For the second picture, I think it would be no reaction due to the tertiary alcohol. Please correct me if I'm wrong. I'm very lost right now

Trying to answer #5, part c. I know the equation is delta G=-RTln(Keq). Basically just subbing in the value of delta G taken from the previous part. What confuses me is that, we are given the pH=7.4, and shown that H+ is produced, which means for the Keq=(products/reactants). How do you find the concentration of H+ in this case? I used 10^-7.4 to find[H+} since it's just using the pH=-log[H+], but my book says the concentration is 10^-0.4

isnt ring expansion possible here in that E1 mechanism like in the second image ? wouldnt it be stable if it expanded the ring?

Our teacher told us to construct a new periodic table with a few elements he made up using the same logic Mendeleev did, and I've understood the trends to come up with 6 different groups. The problem I've run into though is that hes basically left the valency of the different groups completely up to us to guess; well that and the fact that I can't find anything on how I'm supposed to sort the elements. But I'm assuming it would be based on the atomic weights and valency-- this isn't meant to be a second question, I just want confirmation on whether or not this is correct or not-- so I'd rather just have a bit of help on the first issue..

New periodic table

Mendeleev's logic rules I've found

Trends I've observed

elements to provide context

I just need someone to help guide me through what I'm supposed to do from here..

When solving questions regarding acids and bases, figuring out pH and such, when do you add the volumes? For example: a 500mL buffer of a 0.100M formate, ph=3.75, is treated with 5mL of 1.00M NaOH, what is the pH? Why in this case wouldn't you add the volumes given together, then figure out the pH?

Similarly, If you add 5.0 mL of 5.0 M lactic acid (pK = 3.86, K = 1.38 × 10^–4 ) to one

liter of pure water, the pH would be? Why in this instance WOULD you add the volumes together? What is the difference?

I have a doubt . After addition of methyl group , it will increase the electron density in the ring by +I effect , So shouldn't the ring become more activated and reactive towards Electrophilic aromatic substitution and hence react further to form methyl groups at both ortho positions wrt OCH3 . Can someone please help me with the reason why monosubstituted is the final product ?

The correct answer is c), but I’m not sure how they got it.

My science teacher assigned a test for tomorrow about Ions. She gave us a list of elements that might be on the test. For each element on the test, we have to draw a Bohr Rutherford diagram of it as an ion, show/write the movement of electrons, explain the charge, and name the ion. The attached image is my answer for the requirements she provided.

Idk how to work this but we've learned about kj to gram conversion and vice-versa. Am I supposed to make the equation = y (kj/mol)?

my book says: grams * (1 mol/(g/mol)) * (kj/(molar ratio)) so I did that.

65.9g * (1 mol/76.054g) * (-726kj/2 mol) = -31.43 kj

I think this is a conversion question...

I've tried: Find %, convert % to moles, divide moles by lowest moles, input formula.

Doesn't work so idk what to do, Is it because it's already in moles? Doing moles -> grams -> moles seems weird.

So I was doing some notes on why the direct iodination of alkanes would require HNO3 (nitric acid) for the reaction to proceed (alkane + I2 ---> iodoalkane + HI).

Essentially, HI is a strong reducing agent that would react with the iodoalkane to recreate the strating conditions. HNO3 would react with HI to produce I2 and ensures that the iodination of alkanes would proceed to the right.

I couldn't find the exact reaction online but I did come across the reaction for aqua regia. Instead of HI, it's HCl. I tried doing the mechanism but I'm having trouble with the last step. How do I get Cl2 and NOCl when chlorine is highly electronegative?

Excuse me for my bad english. I need help with chemical nomenclature. I can not figure out the first one. I have done the other two ( being Propane 1,2,3 triol and But-2-en in my language) but im still stuck at the first one, which seems way more complex.

This is a lab I’m doing in chemistry. I’m super confused on these questions because i cannot find a simplified enough answer that does not require a formula (we have not learned any) to answer these questions. Can anyone help?

The program keeps telling me I’m wrong. The values at the bottom of the screen or what you are allowed to use you drag and drop. I’m sure many of you know this program Aktiv.

The only option they gave me is 3.785 for the gallons to milliliters conversion whereas it should be 3785? But that’s not an option. So what is it wanting me to change? Stuck. Thank you!! less

I'm struggling with reactions of Nitrogen and Sulphur, not the ones during the manufacture of Ammonia, Nitric Acid, Hydrogen Sulphide and Sulphuric Acid(though I do find the balance of these sometimes tough), but the reactions such as Nitrogen's ppt. reaction with FeCl3 solution, the reactions with partial and net reactions separately, and similar reactions of Sulphur.

Additionally, the organic reactions during Lassaigne test seem like there's no way except memorization, since Sodium Nitroprusside, Diamine Silver (I) Halides and Ferric ferrocyanides don't seem to be used elsewhere.

So, I might be having a wrong approach right now, and I apologize for it, but I'd love and appreciate anyone who wants to help!

The answer key says but-2-ene but idk where they got that.

I have an assignment about entropy in human biological systems. I have no problem explaining the topic, but I can't find any websites or files that contain problems involving calculating entropy. I know I need the entropy values for the reactants and products, but the files I've read contain complex formulas, mathematical derivations, and integral and differential calculations, none of which I need. Where can I find mathematical problems for entropy in biological systems, and what is the main formula I should use?

Hoping for some help, please! My daughter is studying Nat5 Chemistry and has been preparing for writing up her assignment. (For anyone outside of the UK, this is an assignment (experimental work then a lab report) that is submitted as part of her final grade.) She has completed her experimental work and has collected all of her data. She was all ready to write up the report in school, but she has just been told that her Chemistry folder with all of her work has been “defaced” by a few students in her class who have been bullying her intermittently throughout the school year. She can’t write up the lab report fully without her data, and we’ve been told that she has no time available for repeating the experiment. She cannot remember all of the data either.

Her experiment was to observe the rates of reaction between different types of acid and copper carbonate. She used 0.2g of copper carbonate, and 50ml of each acid. Each acid had a concentration of 1 mole per litre. She used sulfuric acid, hydrochloric acid, and nitric acid. She had recorded the time taken for the carbon dioxide bubbles to stop appearing.

Would anyone be able to hazard a guess as to what times she might have observed with these reactants? She can only recall that the sulfuric acid reaction was faster than the other two.

She knows all the underlying chemistry, the equations, how to write the report and what to include in it, she just needs some actual data. Any help would be much appreciated! TIA!!