11/09/15
CHEM 60 Quiz 6 (15 points)
Answer Key
Name _________________________________
1. (7 points) Write the full-formula, complete ionic, and net ionic equation (FFE, CIE, and NIE)
for each of the two reactions described below. In each equation, indicate physical state of
each reactant and product: (s), (l), (g), or (aq).
(a) Aqueous solutions of chromium(III) nitrate and potassium phosphate are mixed.
FFE: Cr(NO3)3(aq)
+
K3PO4(aq)
→
CrPO4(s)
+
3 KNO3(aq)
CIE: Cr3+(aq) + 3NO3−(aq) + 3K+(aq) + PO43−(aq) → CrPO4(s) + 3K+(aq) + 3NO3−(aq)
NIE: Cr3+(aq)
+
PO43−(aq)
→
CrPO4(s)
(b) Aqueous solutions of acetic acid (HC2H3O2) and sodium carbonate are mixed.
FFE: 2 HC2H3O2(aq)
+
Na2CO3(aq)
→
2 NaC2H3O2(aq)
+
CO2(g)
+
H2O(l)
CIE: 2HC2H3O2(aq) + 2Na+(aq) + CO32−(aq) → 2Na+(aq) + C2H3O2−(aq) + CO2(g) + H2O(l)
NIE: 2 HC2H3O2(aq)
+
CO32−(aq)
→
C2H3O2−(aq)
+
CO2(g)
+
H2O(l)
2. (5 points) What is an emission spectrum? Use the Bohr model to explain why the emission
spectrum of the hydrogen consists of distinct lines at specific wavelengths.
PLEASE TURN OVER!!!
3. (3 points) Using abbreviations suggested in parentheses, list the following types of
electromagnetic radiation – visible light (vis), gamma rays (γ rays), radio waves (radio),
ultraviolet light (UV) and microwaves (micro):
(a) in order of decreasing energy per photon
γ rays > UV > vis >micro > radio
(b) in order of decreasing frequency
γ rays > UV > vis >micro > radio
(c) in order of decreasing wavelength
radio > micro > UV > vis > γ rays