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|Exam 2 Review Key |Leader: |Natalie |

|Supplemental Instruction | | |

|Iowa State University | | |

| |Course: |Chem 163 |

| |Instructor: |Burke |

| |Date: |2-28-14 |

1) Suppose a red laser pointer emits light with a wavelength of 600 nm, calculate the energy in kJ (E=hc/ λ) (h=6.626x10-34J*s) (c=3.00x108 m/s).

1x109nm 6.626x10-34 J*s 3.00x108m 1 kJ

600 nm 1 m 1 s 1000 J

2) Which of the following is symmetrical?

a) CH2Cl2

b) COH2

c) Water

d) Carbon Dioxide

3) Write the subshells corresponding to the following shell and the max number of electrons each shell and subshell hold and the shape of the subshell.

a) n=1: s (2 e-) total electrons for n=1 (2e-), s subshell= sphere shaped

b)n=2: s (2e-), p (6e-), total electrons for n=2 (8 e-), s= sphere, p= dumbbell

c)n=3: s (2e-), p (6 e-), d (10 e-), total electrons for n=3 (18e-) s= sphere, p=dumbbell, d= clover

d)n=4: s (2e-), p (6 e-), d (10e-), f (14 e-), total electrons for n=4 (32 e-) s= sphere, p= dumbbell, d= clover, f you don’t need to know the shape

4) Write an electron configuration for a stable ion of S.

1s22s22p63s23p4 or [Ne]3s23p4

5) Define Symmetry:

a compound is symmetrical when there are no lone pairs around the central atom and when all the binding elements are the same.

6) Give the element symbol and name for the following:

a)[Ar]4s23d2 Ti

b)1s2s222p63s23p4 S

7) Explain the difference between ground state and excited state:

Ground State: where you expect electrons to be.

Excited State: when electrons are not where you expect them to be.

8) Circle the following that does not correspond to a condensed phase of matter

a) Water Vapor

b) Motor Oil

c) PVC Pipe

d) Rubbing Alcohol

9) Give the chemical formula and name of the compound formed between the given elements:

a) Barium (Ba) and Phosphorous (P) Ba3P2 Barium Phosphide

b) Potassium (K) and Sulfur (S) K2S Potassium Sulfide

10) Explain the difference between an ionic and covalent bond. Are these intermolecular or intramolecular forces?

Ionic: transfer of electrons.

Covalent: sharing of electrons

11) Circle the following statement that is true

a) London> Dipolar

b)Intermolecular forces are most important in the liquid state of matter.

c)Hydrogen bonding is the weakest intermolecular force

d) Dipolar intermolecular forces are 10% as strong as intramolecular forces.

12) Which is the most electronegative?

a. Se b. Cr c. S d. P e. Cs

13) Choose the element with the highest ionization energy.

a. Na b. Ni c. As d.N e. Si

14) Arrange the following according to increasing atomic size.

a. Ba b. Sr c. Sn d. Te Te ................
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