1. Explain what a flame test has to do with atomic spectroscopy. 2. Consider the

Question

1. Explain what a flame test has to do with atomic spectroscopy.

2. Consider the electron of the H atom that undergoes the transition of n = 9->6.

a). How much energy is released? Show your calculation carefully. As usual, all setups must include units.

b). What would be the wavelength (in nm) of the light emitted? Show your calculations carefully. As usual, all setups must include units

3. Would you expect the emission lines in the lyman series to be in the Visible region?

4. What is the total number of groups of valence electrons in each of the following? (a) ClO2- ion (Cl is chlorine) (b) COS (c) H3O+

5. Identify each of the following as having ionic bonds, covalent bonds or both: (a) NaClO2 (b) COS (c) BeCl2 (Cl is chlorine.)

6. Give a Lewis structure for each of the following. If resonance exists, give all the resonance structures as well: a) NI3(I is iodine)

b) O2

c) COS (C is the central atom)

d) N2

e) ClBr2+ (chlorine is the central atom)

f) KBr

7. Determine which of the three resonance structures for ClF2 + is most stable and explain why. (Hint: Show the formal charges in these structures and think about where the charges are.) F Cl F F Cl F F Cl F : .. .. : .. .. .. : .. : .. .. .. .. .. .. : .. :

8. Name the molecular geometry and give the bond angles of the most stable structure in each of the following: a) NI3 b) COS c) ClBr2+

9. Give the hybridization of the central atom of each of the species in Question 8 above.

10. Using only a periodic table (without referring to the Electronegativity Table unless necessary) indicate the polarity of the bonds shown below. If the bond is nonpolar, say so: a) N-O

b) Cl–I

c) C-O

d) H–Cl

e) C-S

f) H–K

11. Sketch each species to show correct molecular geometry, bond dipoles and then state whether each species is polar or nonpolar. If resonance structures exist, use the most stable one. a) NH3

b) COS

c) ClBr2+

Explanation / Answer

1.Atomic emission spectra are created when atoms of an element have energy added to them (by heating, or running electric current through an emission tube filled with a gas). With the naked eye, you see a single color of light (which is the sum total of all the colors of light produced by a given element). A tool called a spectroscope will reveal the unique frequencies of light being given off by the atoms of the element.

3. The emission lines in the lyman series are not in the Visible region. The emission lines in the lyman series are in the Ultraviolet region. The emission lines in the balmerseries are in the Visible region.

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