Question

2.
What is the oxidation state for the atoms in the reaction:
2 Al + 8 H2O → 2 H+1 + 3 H2 + 2 Al(OH)4-1
a)
Elemental aluminum (Al)
b)
One hydrogen atom in H2O
c)
One oxygen atom in H20
d)
Elemental hydrogen (H)
e)
One aluminum atom in Al(OH)4-1
f)
One oxygen atom in Al(OH)4-1
g)
One hydrogen atom in Al(OH)4-1

Answer 1

do u know how to find oxidation state of element or any ion :)

Answer 2

I dont - could you guide me in the right direction?

Answer 3

To find the oxidation state of an element in a particular molecule, note the type and number of each element atom in the compound. Knowing the constant oxidation states of the elements, write an equation that adds up the elemental oxidation states of the elements in a molecule. Identify the oxidation state of the element of interest as an unknown.
5
Solve for oxidation state. Set the equation derived for the sum of the elemental oxidation states in a molecule equal to the charge of the molecule. The charge of the molecule may be non 0 if the molecule is an ion. Solve the equation for the unknown, which will yield the oxidation state of the element of interest.
6
Try an example. KMnO4 is a neutral atom with a charge of 0. Potassium is a metal, and therefore has an oxidation state of +1. The oxygen atom has an oxidation state of -2. The equation generated is 1 + Mn + (4 times -2) equals 0. Solving the equation, the oxidation state of Mn in this molecule is 1+Mn-8=0 solves to Mn=7. Therefore, 7 is the oxidation state of Mn in this molecule.

Answer 4

http://www.chemguide.co.uk/inorganic/redox/oxidnstates.html
this can help u

Answer 5

I've tried using the website, I just don't understand how I'm supposed to do.
I'm so confused

Answer 6

*ive tried using the website before

Answer 7

IT IS AN APPARENT CHARGE ON AN ATOM OF AN ELEMENT IN A MOLECULE OR AN ION .IT MAY BE POSITIVE OR NEGATIVE

Answer 8

Oxidation Number Rules


The oxidation number for an atom in its elemental form is always zero.
A substance is elemental if both of the following are true:
only one kind of atom is present
charge = 0
Examples:
S8: The oxidation number of S = 0
Fe: The oxidation number of Fe = 0
The oxidation number of a monoatomic ion = charge of the monatomic ion.
Examples:
Oxidation number of S2- is -2.
Oxidation number of Al3+ is +3.
The oxidation number of all Group 1A metals = +1 (unless elemental).
The oxidation number of all Group 2A metals = +2 (unless elemental).
Hydrogen (H) has two possible oxidation numbers:
+1 when bonded to a nonmetal
-1 when bonded to a metal
Oxygen (O) has two possilbe oxidation numbers:
-1 in peroxides (O22-)....pretty uncommon
-2 in all other compounds...most common
The oxidation number of fluorine (F) is always -1.
The sum of the oxidation numbers of all atoms (or ions) in a neutral compound = 0.
The sum of the oxidation numbers of all atoms in a polyatomic ion = charge on the polyatomic ion.

Answer 9

I don't understand but thank you for all of your efforts. I am definitely a chemistry failure. I'll email my teacher.

Answer 10

try balancing equations of redox u can understand it