In writing the chemical equation for a precipitation reaction, what abbreviation of the physical state must appear with one of the products? (s) (I) (w) (g) none of the above QUESTION 15 What is the balanced oxidation half-reaction for the following unbalanced redox reaction? Ca(s)+Ag+(aq)Ca2+(aq)+Ag(s)2Ag++2e2Ag2e+CaCa2+CaCa2++2eAg+Ag+e none of the above QUESTION 16 The oxidation number of P in PO43 is: 5+5+83 none of the above QUESTION 17 The Arrhenius definition of an acid is: produces OHin solution. produces H in solution. a proton acceptor. a proton donor. none of the above