Homework Help Thread

[Enigma]

Re: Homework Help Thread

i was tryna see if someone was trying to help before anythingg .. anywayss
i have a chart. Making Models of Compounds


i need to write the correct formula, and the correct name. (i know how to do the names not the formula )
for example :

Na+ and CH3COO-

the name is Sodium Acetate and the formula? :[




heres one i did :

NH4+ and F-

it's NH4F












(Tiny numbers are subscript .. normal numbers are upperscript? :suprised: ) help

Sodium has a 1+ charge, Acetate/ CH3 COO can also be written as C2H3O2 which is easier on my eyes, is a 1- charge.

They're both 1 charges, and cancel out, therefore It's as you wrote you...unless I have forgotten.

[Jamerson]

Re: Homework Help Thread

wat did i write? ^


how about when the number is on top? like :

Mg²+ and F-
or
Al(3 on top)+ and Br- ??
:suprised:

[Enigma]

Re: Homework Help Thread

wat did i write? ^


how about when the number is on top? like :

Mg²+ and F-
or
Al(3 on top)+ and Br- ??
:suprised:

That's the element's charge, which when combining elements into compounds you cross multiply to get the subscripts (there's exceptions).

So, Magnesium has a pos 2 charge and Flourine neg 1, therefore MgF2

Aluminum is in the 13th group, so pos 3 charge and Bromine I think it is, has a neg 1 charge, therefore AlBr3

[epeezy]

Re: Homework Help Thread

Of Mice & Men. John Stienbeck.

Just Finished The Book In Class. Any Thoughts On It If You've Read It, Please Share

We read that book last semester. i thought it was an okay book but i liked how the whole shooting the dog and then shooting Lennie thing related. We watched the movie too which wasn't that good. it bothered me how Lennie wasnt even that big in it lol.

[Jamerson]

Re: Homework Help Thread

That's the element's charge, which when combining elements into compounds you cross multiply to get the subscripts (there's exceptions).

So, Magnesium has a pos 2 charge and Flourine neg 1, therefore MgF2

Aluminum is in the 13th group, so pos 3 charge and Bromine I think it is, has a neg 1 charge, therefore AlBr3

chit. im kinda getting it .. but i dont get these ..


NH4 and CH3COO- (or C2H3O like u said)


and Na+ and CH3COO-

[lovalle]

Re: Homework Help Thread

these dates in italian??

May 5
March 24
June 16
April 30
August 15
January 17
September 1
February 28
November 12
July 31
December 14
October 29

[Jamerson]

Re: Homework Help Thread

these dates in italian??

May 5
March 24
June 16
April 30
August 15
January 17
September 1
February 28
November 12
July 31
December 14
October 29

use this, it works

http://au.babelfish.yahoo.com/translate_txt

[lovalle]

Re: Homework Help Thread

these dates in italian??

May 5
March 24
June 16
April 30
August 15
January 17
September 1
February 28
November 12
July 31
December 14
October 29

use this, it works

http://au.babelfish.yahoo.com/translate_txt

thanks

[Jamerson]

Re: Homework Help Thread

i still need help with this chemistry ish

[Enigma]

Re: Homework Help Thread

That's the element's charge, which when combining elements into compounds you cross multiply to get the subscripts (there's exceptions).

So, Magnesium has a pos 2 charge and Flourine neg 1, therefore MgF2

Aluminum is in the 13th group, so pos 3 charge and Bromine I think it is, has a neg 1 charge, therefore AlBr3

chit. im kinda getting it .. but i dont get these ..


NH4 and CH3COO- (or C2H3O like u said)


and Na+ and CH3COO-

NH4 is ammonium with a 1+ charge, The other is Acetate with a 1- charge. When you add them together to form a bigger compound, you cross multiply the charges, so you take the 1+ of NH4 and multiply Acetate by 1, which does nothing different, making it C2H3O and when you multiply Ammonium by 1 it equals the same, so it's NH4C2H3O

[Enigma]

Re: Homework Help Thread

You're welcome.

[Jamerson]

Re: Homework Help Thread

You're welcome.

i aint see it .. but thankss ..
ima copy the rest from somebody tomorrow