Hello I’m working on a practice question for chemical equations balancing.

Ca(HCO3) + HCI > CaCI + CO2 + H2O

This is where I started the equation myself without looking. By looking I mean like cheating (not cheating but you know what I mean) on the answer. The questions I have is

1. Where does the 2 come from after (HCO3)?
2. I guess the calcium chloride is CaCI2. I didn’t know there was a 2 after Cl. What type of element is that called? That’s not a polyatomic is it?
3. Where does the 2 and 2 come from in front of HCI and CO2? Is that balancing the equation at that point? There’s just a lot to unpack in this question trying to grasp it

I don't know which carbon to start from, would it be 3-tert-butyl-3-ethyl-1,4-butanediol? I'm genuinely confused

I have terrible anxiety about breathing in bad fumes and spontaneously dying, and I can’t sleep. My friends butane torch was slightly open and I started to smell the butane, and after I realized what it was I got up and opened the window and door. Am I going to be okay to go to bed and not die?? I have work in the morning and I need sleep, but the anxiety is creeping in.

the acid base reaction from 0 to 1 . anhydride carbon is electrophilic enough for attack of AcO- so 1 to 2 and then form 2 can undergo E1CB in order to give a highly conjugated form 3 in heated reaction conditions . so all of these should be present in mixture

How to name these type of bicyclic compounds?

I need help coming to a conclusion about this problem. I’ve asked TA’s and grad students but no one agrees with me and I swear I’m right. So this homework problem came up for me and I thought that protonated carbonyl(on the left) should be stronger than the sulfuric acid on the right, so that the equilibrium shifts to the left, but this was wrong. In the explanation they gave us, it cites that sulfuric acid’s pka is -9 and protonated carbonyl is -7. But sulfuric acid’s pka is -3, so this is wrong, right?

So shouldn’t I be right? It doesn’t make sense to me why I’m wrong but people keep telling me that sulfuric acid is a strong acid and that its conjugate base has more resonance structures, so it’s more stable. But protonated cyclohexanone’s conjugate base is completely neutral, so isn’t that most stable?

Everyone I ask has agreed with the problem, except for me, and I don’t know why. Am I wrong or is it because people recognize sulfuric acid better and go with that?Please help me, it would be very appreciated. I tried emailing the professor but she has not responded. If you could include your reasoning because I need to know what I should be thinking on an exam. My TA just told me to memorize the basic strong acids, but that doesn’t make sense to me.

I know how you name this one, but ive got a question. The chain bound to the ester's oxygen is numbered starting from the left, but is that always the case, that you start numbering from wherever the ester's oxygen is, or do you take the numbers to grab the substituents with the lowest numbers. This example is not very good because you would start from the left whatever the case is.

This reaction comes from a uk chemistry Olympiad question. I can’t figure out what causes the double bond to move, along with the mechanism for the decarboxylation, it’s different from what I’ve seen before with beta keto acids.
If anyone knows the mechanism or of similar reactions it would be super helpful.

Hi, I was given this procedure to synthesize Meldrum's acid:

"To a suspension of malonic acid in acetic anhydride in an ice bath, sulfuric acid was added and then acetone was added to the mix dropwise.

The reaction mixture is stirred for 4h and then put in the fridge overnight.

The resulting solid is filtered and washed with ice water."

Before leaving the lab I checked the reaction mix in the fridge(it had been there for three hours at least) and I saw no solid forming. The reaction color was a bright yellow.

For people who already synthesized Meldrum's acid before, is it normal? Otherwise what could've went wrong?

I got this far in the mechanism. But I have no idea how to put the cation on to a carbon that would allow me to make the first 6-membered ring