Chemistry 2-13-09 Oxidation Numbers
CHEMISTRY: One man’s rust is another student’s lesson in chemistry! From Friday – here’s the lecture on oxidation numbers. Lots of good practice at the end. Hope the practice in the computer lab Thursday helped. Go back to sciencegeek.net
February 16th, 2009 at 7:57 PM
I cant remember how to find the charge when doing oxidation?
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February 17th, 2009 at 6:09 AM
Robyne:
All the oxidation numbers added up equal 0. Take NaH since hydrogen is with a metal it is -1 and then Na is in group 1 so the charge or oxidation number is +1
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February 17th, 2009 at 6:34 PM
Okay so what is the relationship between oxidation numbers and charges?
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Carlee Edwards Reply:
February 17th, 2009 at 7:33 PM
Emily:
The charge is very similar to the oxidation number because the oxidation number is how many electrons are gained or shared between atoms like the charge, but in moleculs there is no ‘real’ charge because the electrons are all shared.
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February 17th, 2009 at 9:31 PM
On the test will it be distinguished for us which system to use in the renaming/re writing of a compound
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February 18th, 2009 at 11:22 AM
How do you calculate oxidation numbers in a polyatomic ion?
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February 18th, 2009 at 6:48 PM
how do you know which are covalent ions and which are ionic ions?
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February 18th, 2009 at 7:08 PM
When writing the formulas, how do you know when to cross over?
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February 18th, 2009 at 7:43 PM
so when do you call oxidation numbers oxidation numbers? and what else are they know as when (or if) they aren’t called oxidation numbers?
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February 18th, 2009 at 8:34 PM
Is this right?:
when you have a polyatomic ion you can only use the stock system and roman numerals. Then, with covalents one can use either roman numerals and prefixes. Prefixes are only for covalent? and finally 2 nonmetals or a nonmetal and a metalliod make it covalent or ionic
im sry its so long but since we are moving on I wana make sure i got it :-}
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February 18th, 2009 at 8:36 PM
I DIDNT FORGET TO POST A COMMENT FOR THIS WEEK!!!YEAH!(and i even did it early)
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February 18th, 2009 at 9:21 PM
I can’t remember but can nonmetals have more than one oxidation number?
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February 18th, 2009 at 10:00 PM
courtney:
ionic always has a polyatomic ions and are with a metel. covelant never has a polyatomic ion.
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February 19th, 2009 at 8:39 AM
Why is oxygen’s oxidation number always -2?
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February 19th, 2009 at 12:24 PM
How do you know the charges of oxidation numbers?
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February 19th, 2009 at 2:11 PM
How do oxidation numbers explain why metal rusts?
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February 19th, 2009 at 2:26 PM
To answer Katie McMurtry, oxygen is the second most electronegative element.
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February 19th, 2009 at 3:07 PM
how does oxidation cause rust?
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February 19th, 2009 at 6:40 PM
why can’t you use prefixes with roman numerals
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February 19th, 2009 at 7:18 PM
I’m a little confused, when you have something like Iron (II) Oxide, is it supposed to look like FeO2 with the 2 as a subscript?
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February 19th, 2009 at 7:19 PM
What is the highest oxidation number that an element can have?
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February 19th, 2009 at 8:20 PM
After which step are you supposed to cross over?
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February 20th, 2009 at 1:34 PM
can an element not have an oxidation number
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February 20th, 2009 at 9:50 PM
how do u determ the oxidation numbers of an element?i still dont understand that mrs skinner.
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