Find the oxidation state of each of the following

1. Se in H2SeO3
2. N in Al(NO3)3
3. H in BaH2
4. Si in Na4SiO4
5. I in NaIO4
6. O in Na2O2
7. Br in HBrO
8. N in N2O3
9. C in (NH4)2CO3
10. Si in NH4AlSiO4

What are the resulting coefficients when you balance the chemical equation for the combustion of ethane, c2h6? in this reaction, ethane is burned in the presence of oxygen (o2) to form carbon dioxide (co2) and water (h2o). (g)+(g)→(g)+(g)

One does not belong why? ice, gold ,wood ,diamond and table salt

Phosphoric acid is a triprotic acid ( =6.9×10−3 , =6.2×10−8 , and =4.8×10−13 ). to find the ph of a buffer composed of h2po−4(aq) and hpo2−4(aq) , which p value should be used in the henderson–hasselbalch equation? p k a1 = 2.16 p k a2 = 7.21 p k a3 = 12.32 calculate the ph of a buffer solution obtained by dissolving 18.0 18.0 g of kh2po4(s) kh 2 po 4 ( s ) and 33.0 33.0 g of na2hpo4(s) na 2 hpo 4 ( s ) in water and then diluting to 1.00 l.