Need Help for chemistry very urgent A reaction occurs when aqueous hydrosulfuric acid (H2S) and an aqueous solution of Iron (III) Bromide forming a precipitate of Iron (III) sulfide and aqueous hydrogen bromide. Write the chemical and net ionic equations for the reaction.

How are isotopes of the same chemical element alike? how are they different?

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.

State one important difference between a physical change and a chemical change?