Amonoprotic weak acid, ha , dissociates in water according to the reaction ha ( aq ) − ⇀ ↽ − h + ( aq ) + a − ( aq ) the equilibrium concentrations of the reactants and products are [ ha ] = 0.170 m , [ h + ] = 2.00 × 10 − 4 m , and [ a − ] = 2.00 × 10 − 4 m . calculate the value of p k a for the acid ha .

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

4. a 20-kg child is tossed up into the air by her parent. the child is 2 meters off the ground traveling 5 m/s. circle one: ke / gpe / both show your work for finding the values of each type of energy the object has:

Iron (fe) reacts with copper sulfate (cuso4) to form iron (ii) sulfate. in this reaction, cu2+ gains electrons to form cu. which statement is true about this reaction? fe(s) + cuso4(aq) → feso4(aq) + cu(s)