Tell me how to pass my chem midterm

Quote:

---

Originally Posted by Grod

Right, I remember now.

Got it right here, right next to me.:)

I just found this problem that I'm confused on....

I want to find the volume of something 27.0 cm long(3 significant fig) 14.55 wide(4 sg fg) and 9.3 cm high(2 sg fg)

I'm supposed to express the answer in the correct number of significant figures. Isn't there a rule you can only express to the least number of sg fgs? Like for here it would be two.... (for 9.3)

So the answer would be 3653.50(dropping the extra 5)

Did I do that right?

---

No, because 3653.50 has 6 significant figures in it. The correct answer is 3700.

Assuming this thing is a rectangular box...

Quote:

---

Originally Posted by Spartiate

No, because 3653.50 has 6 significant figures in it. The correct answer is 3700.

---

Ohhh

Thanks, took me a second to get it.

Quote:

---

Originally Posted by Spartiate

Assuming this thing is a rectangular box...

---

I'm assuming so.

I don't know if this is how you are supposed to do it but here we are taught that if adding and subtracting then you round to the least number of decimal values and if multiplying and dividing use sig figs, so Spart is correct.

Also just some general tips, chem usually builds on itself so you may find answers elsewhere in the test. For example if one question asks for the formula of acetic acid and you can't remember it, it could be used in a later problem on the test so just keep on the lookout for that kind of thing. Also if you can't get one in a section, do the rest of the section and then come back and see if you can remember how to do it now that you did some others like it. If you wait until the very end to go back and do them all your mind will not be as focused on solving that kind. Also make it obvious if you skip any or have trouble on one such as writing a big question mark. Later on if you think of something it will be pretty simple to find that problem again.

As for cramming, I do it for every test and I have a good memory and I don't get frustrated trying to memorize alot, but you may not want to study obsessively before it to the point where you are just confusing yourself and you aren't able to think. Also during the test, just relax and make sure you read what you are doing. Don't spend too much time on a hard problem or section, you can come back later when there is time left. If you try it first and get nowhere, you may run short on time later and panic and rush.

Also as it's time to take the exam, tell yourself that you know what you do and you don't know what you don't so just give it your best effort and I'm sure you'll do fine. :banana:Good luck:banana:

Quote:

---

Originally Posted by Kushna Mufeed

Just don't do what these people did.

---

Haha, just saw that, that stuff is hilarious, thanks :chuckle:...

You can always cheat :P .

Quote:

---

Originally Posted by Bonsay

You can always cheat :P .

---

yes very casually sit next to a smart kid

I just took it last period -- I honestly don't know how well I did.

Thank you for all the help everyone!:D

Quote:

---

Originally Posted by Grod

I just took it last period -- I honestly don't know how well I did.

Thank you for all the help everyone!:D

---

What? A test doesn't end when you put down your pencil! Time to go work your teacher...

Quote:

---

Originally Posted by Spartiate

What? A test doesn't end when you put down your pencil! Time to go work your teacher...

---

LMAO and when you see your teacher in the hallway start talking about how everyone thought it was hard and that it needs a big curve. My chem teacher always curved tests like 15%. I didn't get under 100% on any test all year and I got like a 116% on the final (with the curve and some extra credit).