Can someone help me with Chemistry?

Question

1. For the chlorate ion ClO3- what are the oxidation numbers of Cl and O respectively?

2. Determine the correct oxidation numbers for all elements in Ca(ClO)2 in the order that the elements are shown in the formula.

3. Which of the following equations does no represt an oxidation- reduction reaction?
a) 3Al + 6HCl = 3H2 + AlCl3
b) 2H2O = 2H2 +O2
c) 2NaCl + Pb(NO3)2 = PbCl2 +3NaNO3
d) 2NaI + Br2 = 2NaBr +I2
e) Cu(NO3)2 + Zn = Zn(NO3)2 +Cu

4. True or False, Hydrogen is oxidized in the folowing chemical reaction
H2(g) + Cl2(g) = 2HCl

5. True or False, Thorium oxide is reduced to thorium metal with calcium metal as shown below.
ThO2 + 2Ca(s) = Th(s) +2CaO

Answer

1. 
The charge of the ion is equal to the oxidation state of the ion, therefore the oxidation state for the whole ion is -1
The oxidation state for an poly atomic ion is equal to the sum of its constituents

The oxidation state of oxygen ions are always -2, except in peroxide (O2) which is -1
In this case, it is -2

Since there are 3 oxygen, the oxidation state of the chloride can be solved by
-2*3 + x = -1
- 6 + x  =  -1
x = +5

Oxidation number: Cl: +5, O: -2

2. 

Ca +2
Cl +1
O -2

3. b - is a decomposition of covalent bond, there is no electron transfer


4. True, the oxidation state of oxygen changed from 0 (neutral) to +1 in HCl, thus is oxidized

5. True, the thorium is reduced while the calcium is oxidized (you can see how they got the name)

Can someone help me with Chemistry?

Responses (1)