Please explain it to me

I can’t seem to figure out how to do this. I need to be able to identify which color is which molecule/atom but I have no idea where to start. This crystalroster is Mg3Si4O10(OH)2 (I know OH is supposed to count as one ball) any help is much appreciated!

How would u guys name this.

I’m getting 5-isobutyl-6methyldecane OR 6-methyl-5-(2-methylpropyl)decane

But my teachers answer key gets 5-isobutyl-6methyldecane OR 5-methyl-6-(2-methylpropyl)decane? It appears for the second one my teacher reversed the order of numbering the carbons which I didn’t know you could do? Is that allowed. Why is the same numbering not kept throughout regardless of whether the substituents switch order due to the alphabet? Any help is greatly appreciated!!!

Calculate the constant of equilibrium of the reaction : A + 2B <—> 2C

Knowing that when we put 2 mol of A and 2 mol of B, the mix obtained contains 40% in mol of C

That’s all the question says and I’m stuck on this. I have a final exam tomorrow so I don’t want to go there knowing there’s a chance an exercise like this comes up there

These are some of my chem exam ques i think i did a pretty good job but nervous abt the sanswers can someone please check and correct them (Answers are written in blue)

How would you guys approach such a question, and what is your final answer?

Does anyone know how to find this out?

NOTE: it is NOT because the E is uppercase or because E0 is redundant. All answers require it to be in E notation no matter what.

Hi all, I’ve been out of school for a few years and have to upgrade my chemistry because I didn’t take it in high school.

This question about calculating the heat of a reaction. I’m sure my calculations are all correct, but I keep getting answers wrong and I think it’s because my rounding is incorrect.

In this program, we get two chances to answer before it is marked wrong. When it is marked wrong, we do not get the right answer which sucks. I entered both -1.1E0 because it is exothermic but then also tried 1.1E0 because I second guessed.

I know when you multiply you take the smallest figs that you are given and that is the number you round too in your final answer. From my understanding 250 would be the number with the smallest sig figs so it would be to two sig figs? I don’t understand why it is wrong. Someone in class said something about adding a decimal to the end of it (250.) but can you just do that?

The endpoint

I know how to solve problems with one Ka value, it's using the Henderson-Hasselbalch equation.

But I don't know how to solve the following problems.

d) 100 ml Na3PO4 (0,20 mol/l) + 100 ml NaH2PO4 (0,10 mol/l)

Answer: 11,9

e) 100 ml Na3PO4 (0,10 mol/l) + 50 ml NaH2PO4 (0,40 mol/l)

Answer: 7,5

Ka,1 = 7,1 x 10^-3

Ka,2 = 6,3 x 10^-8

Ka,3 = 4,4 x 10^-13

How do I get to the answer? What Ka values are used?

I don't get the question, nor do I have any idea what it's trying to ask

How does it make any sense if you add 14.0g of H2 will triple the volume of a mixture?

How would I find out the orbitals from closet to the nucleus to farthest. This is the diagram given by the teacher. I know what to do with the arrows but what do I do with the ones without an arrow?

Hiii. Ok so first of all, I am absolutely clueless when it comes to chemistry. I still don't fully get redox reactions, but rn I'm stuck with this:

AgNO3-O + HCl-O -> ???

Where the chloride ions will precipitate.

I know AgCl percipitates, but how do i even get there? And what do i do with the rest?

I wouldn't even know where to start. Please help.

For the first one, I got the same answers up until I got to the 4s, because I feel like they should technically be 4s² and then continue on. Then in sections like the one for Cr3+, the 4s² is completely skipped.

For the second question I am completely lost.

Trying to figure out why on my class notes teacher used 44 mol/g or kmol/kg instead of g/kol

Top: similar to class notes and bottom is how I would go about it

What is Element Y?

In the Wurtz reaction, when non-identical alkyl halides react, they produce a mixture of homocoupling and heterocoupling products. Since these alkanes often have similar physical properties, such as close boiling points, it becomes difficult to separate them. Are there alternative methods to get a single alkane? (my teacher told me smth like corey house or kore howe reaction)

For this question, what's the difference between A and C? How can you tell? Aren't both carbons bonded to 2 R groups, so would Markovinkov addition apply? How do you know where the Bromine adds?

How would I know how to solve this problem? The correct answer is K, but I'm not sure how to solve it exactly