<p>Ok so I am kind of flipping out about the test tomorrow (i'm sure others of you are too..) so I was hoping that this could be a thread where people ask questions of stuff they are confused about and answer other peoples questions and everyone could look and learn and be happy...</p>
<p>nevertheless I have a few questions:</p>
<p>What factors does density depend on?? </p>
<p>And how do you know when you have to use redox reaction techniques to balance the equation? </p>
<p>And also, I am just learning organic chemistry tonight (SO confusing) and I was wondering are there any general properties associated with alkanes, alkenes or alkynes that I should know?? </p>
<p>density is Mass/Volume. if if it wants to know the density of a pure substance at STP (Carbon, Oxygen... elements basically) you would do the molecular weight/22.4</p>
<p>i dont know the answer to ur second question.. sorry</p>
<p>for o-chem (which yes, is unbelievably confusing) there are certain properties associated with each. according to my book (kaplan)</p>
<p>alkanes- only carbon-carbon single bonds</p>
<p>alkenes - atleast one carbon-carbon double bond</p>
<p>alkynes - atleast one carbon-carbon triple bond.</p>
<p>a good way to remember this is to remember that they go in alphabetical order... a, e, and y.</p>
<p>OK thank you, I remember learning that about the alkanes, alkenes, and alkynes.</p>
<p>another question: are any of them polar? It looked in my book like the alkene might have been polar, but I wasn't sure.... also is there anyway to predict the hybrid orbitals for them? I took the barrons practice tests and there were questions on it that I just skipped..</p>
<p>thanks!</p>
<p>and to iin77 I think it might be, but briefly. its in my barron's book, but that's supposed to go to far into the material but I think it was somewhere else to, so I am not sure</p>
<p>No, none of them are polar. But you might have to know saturation like alkanes are but alkenes aren't (I think).
Not sure about hybrid orbitals, sorry.</p>