Chemistry and Biology assignment

Name: ___________________________ Date: ______________________

1. What are the names and formulas of the conjugate bases of these acids:

(a) HNO2 ______ ______ ______ ______ ______

(b) H2SO4 ______ ______ ______ ______ ______

(c) H2S ______ ______ ______ ______ ______

(d) HCN ______ ______ ______ ______ ______

(e) HCOOH ______ ______ ______ ______ ______

2. Compare the strengths of the following pairs of acids:

(a) H2SO4 ______ H2SeO4, (b) H3PO4 ______ H3AsO4

.

3. Write the expressions for the equilibrium constants KP of these thermal decompositions:

(a) 2Na HCO

3

(s) Na

2

CO

3

(s) + CO

2

(g) + H

2

O(g)

(b) 2Ca SO

4

(s) 2Ca O(s) + 2SO

2

(g) + O

2

(g)

4. Predict whether the following reactions would occur spontaneously in aqueous solution at 25 0C. Assume that the initial concentrations of dissolved species are all 1.0 M.

(a) Ca(s) + Cd2+ (aq) → Ca2+ (aq) + Cd(s)

(b) 2Br -(aq) + Sn2+ (aq) → Br2(l) + Sn(s)

(c) 2Ag(s) + Ni2+ (aq) → 2Ag+ (aq) + Ni(s)

(d) Cu+(aq) + Fe3+(aq) → Cu2+ (aq) + Fe2+(aq)

5.Calculate the molality of each of the following aqueous solutions: (a) 2.50 M NaCl solution (density of solution=1.08 g/m L), (b) 48.2 percent by mass KBr solution.

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