Intro to Chemistry homework #1 *DELETED*

Home | Community | Message Board

You are not signed in.
New Account

Forum Index Search Posts Trusted Vendors Highlights Galleries FAQ User List Chat Store Random Growery

This site includes paid links. Please support our sponsors.

Welcome to the Shroomery Message Board! You are experiencing a small sample of what the site has to offer. Please or register to post messages and view our exclusive members-only content. You'll gain access to additional forums, file attachments, board customizations, encrypted private messages, and much more!

Shop: Golden Teacher Liquid Culture For Sale

Jump to first unread post

Pages: 1

SubGen1us

Registered: 11/26/02
Posts: 3,427

Intro to Chemistry homework #1 *DELETED*

#8705764 - 07/31/08 01:55 AM (18 years, 1 month ago)

Post deleted by SubGen1us

Reason for deletion: .

--------------------

Extras:

Top

Gumby
Fishnologist

Registered: 06/13/01
Posts: 26,656

Re: Intro to Chemistry homework #1

[Re: SubGen1us]
#8706289 - 07/31/08 07:10 AM (18 years, 1 month ago)

It's been a long time since I used Gen Chem I stuff, but I'll take a stab at it. No guarantees that I'm right though :tongue:

@ Identify the oxidation number of the underlined element.

Cl2O I had -2 I had the same question in my book when I went to review, it says +1
Cl2O7 I had -2 I think it's +7
Mn2O3 I had 4 I think it's +3
MnO4(with a -2 charge) I had 2 +6

@ Identify the oxidizing agent and reducing agent for the reaction shown.

Fe + Cl2 >>> Fe(with a +3 charge) + Cl -

I had Fe for the oxidizing agent and Cl for the reducing agent Yep

@ What changes in oxidation state occur in this reaction?

4Fe(OH)2 + O2 >>> 2H2O + 2Fe2O3 . H2O I think they're asking you to label the oxidation state for all atoms in the reaction

I'm not sure what their even asking here. Still new to this stuff.

@ What is oxidized?

Still, no clue... Fe, I believe. The (OH)2 kinda throws me off though. Forgot what to do about parenthesis. The way I interpret it is Fe(OH)2 is an ionic compound. OH has a charge of -1, so 2x-1= -2, so Fe is + 2, you take it from there.

@ The following experimental observations are made:

FE + 2Ag(+) >>> Fe(2+) + 2Ag
Mg + Fe(2+) >>> Mg(2+) + Fe

@ Rank the metals as reducing agents.

I had Mg as the strongest, then Fe with Ag as the weakest Seems right, not 100% on that though

@ Rank the metal ions as Oxidizing agents.

I had Ag as the strongest, then Fe with Mg as the weakest. Seems right, not 100% on that though

Edited by Gumby (07/31/08 07:42 AM)

Extras:

Top

Gumby
Fishnologist

Registered: 06/13/01
Posts: 26,656

Re: Intro to Chemistry homework #1

[Re: Gumby]
#8706321 - 07/31/08 07:34 AM (18 years, 1 month ago)

Also, here is a set of rules from my book used to determine oxidation states:

Quote:

1. The oxidation state(OS) of an individual atom in a free element (uncombined with other elements) is 0.

Ex: OS of isolated Cl atom is 0; the two Cl atoms in the molecule Cl₂ both have an OS of 0.

Quote:

2. The total OS of all the atoms in:
(a) neutral species, such as isolated atoms, molecules, and formula units is 0.

Ex: The sum of the OS of all the atoms in CH3OH and all of the ions in MgCl2 is 0

(b) an ion is equal to the charge on the ion

Ex: the OS of Fe in Fe³⁺ is +3. The sum of the OS of all atoms in MnO4 is -1

Quote:

3. In their compounds, the group 1 metals have an OS of +1 and the group 2 metals have an OS of +2.

Ex: The OS of K is +1 in KCl and K2CO3; the OS of MG is +2 in MgBr2 and Mg(NO3)2

Quote:

4. In it's compounds, the OS of fluorine is -1.

Ex: The OS of F is -1 in HF, ClF3, and SF6

Quote:

5. In it's compounds, hydrogen has an OS of +1.

Ex: the OS of H is +1 in HI, H2S, NH3, and CH4

Quote:

6. In it's compounds, oxygen has an OS of -2.

Ex: The OS of O is -2 in H2O, CO2, and KMnO4

Quote:

7. In binary (two-element) compounds with metals:
Group 17 (7a) elements have OS of -1
Group 16 (6a) elements have OS of -2
Group 15 (5a) elements have OS of -3

Ex: THe OS of Br is -1 in MgBr2; The OS of S is -2 in Li2S and the OS of N is -3 in Li3N

Note: If whenever two rules contradict each other, go with the higher numbered rule.

I hope that helps, I remember what a bitch it was for me to understand oxidation at first.

Extras:

Top

Jump to top

Pages: 1

Shop: Golden Teacher Liquid Culture For Sale

Community > The Pub

Similar Threads	Poster	Views	Replies	Last post
Chemistry Homework Help, Pleeaaase?	Cakes	911	9	07/09/07 06:23 PM by Cepheus
Chemistry question ( 1 2 all )	GreenScreen	6,091	39	12/12/06 02:02 PM by Asante
E.T. and the elements of the earth.	Army of None	621	4	10/17/07 01:36 PM by Madtowntripper
. ( 1 2 3 all )	z_x_x_z	4,295	44	11/10/05 09:19 AM by Organic
Chemistry problems, any help?	Hawkeye3	3,568	19	01/08/06 12:01 PM by eVil_
Chemistry is kicking my ass.... ( 1 2 all )	Madtowntripper	2,097	20	10/09/06 10:10 PM by Mezcal
About to take Organic Chemistry.....	Afroshroomerican	1,529	12	05/18/07 06:14 AM by downforpot
Quick chemistry question	FirstAvailable	1,568	11	04/01/04 06:14 PM by FirstAvailable

Extra information

You cannot start new topics / You cannot reply to topics
HTML is disabled / BBCode is enabled
Moderator: Entire Staff
509 topic views. 3 members, 534 guests and 122 web crawlers are browsing this forum.
[ Show Images Only | Sort by Score | Print Topic ]