Homework 9/31/15

1. A) Polar B) ionic C) non-polar D) ionic D) non-polar

2) H-C, H-S, H-Br, H-Cl

4) A hydrogen bond is an electrostatic interaction between a hydrogen bonded to an electronegative element and the unbonded electrons of another highly electronegative element.

Homework 9/18/15

1. F: 1s² 2s² 2p⁵
    Cl:1s² 2s² 2p⁶3s² 3p⁵
    Br:1s² 2s² 2p⁶3s² 3p⁶ 4s² 3d¹⁰ 4p⁵

All of the halogens end with 5 electrons in an outer p shell.

2. Li: 1s² 2s¹
    Na: 1s² 2s² 2p⁶ 3s¹
    K: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

 All of the alkali metals end with a single electron in their outer s shell.

Homework 9/17/18

1. First calculate frequency: v = 3.00 x 10⁸ / 4.36 x 10^-7 = 6.88 x 10¹⁴ Next multiply by plank's constant: E = 6.88 x 10¹⁴ /s X 6.626 x 10^-34Jxs = 4.66 x 10^-19 J

2. The only transition that would result in the emission of light is the first on 3p to 3s.

3. 5.08 x 10¹⁴/s and 5.09 x 10¹⁴/s

Homework 9/16/15

1. (4 x 10^-7/s) v = 3.00 x 10⁸m/s
 v = 7.5 x 10^-7

2. 0.5m x v = 3.00 x 10⁸
v = 6.00 x 10⁹

3. v = 10¹⁹
wavelength = 3 x 10^-11

Homework 9/11/15

1.

2 unpaired electrons

2. 1s² 2s² 2p⁶ 3s² 3p⁵ or [Ne] 3s² 3p⁵

3. 1s² 2s² 2p⁶ 3s¹

Dimensional Analysis Worksheet

1. 5400 inches into miles.

5400 inches x 1 foot       x 1 mile     = 0.085 miles
                       12 inches     5280 ft  .

2. 16 Weeks into seconds

16 weeks x 7 Days  x  24 hours   x 60 minutes  x 60 seconds    = 9,676,800 seconds
                   1 week      1 day            1 hour             1 minute

3.  54 yards in mm

54 yards x 3 feet   x 12 inches x 2.54 cm  x 10 mm  = 49,377 mm
                 1 yard       1 foot         1  inch        1 cm

4. 36 cm/sec. into miles/hour

36 cm x 1 inch    x  1 foot        x 1 mile     x 60 sec.  x  60 min   = .81 miles/hr.
 sec.      2.54 cm      12 inches     5280 ft.      1 min.       1 hr.

5. 1.09 g/ml into lbs./gallon

1.09 g x 1 lb.    x 946ml  x 4 qts. = 9.08 lbs./gal.
  ml        454 g     1 qt.        1 gal.

6.

15 people x 4 slices   x 1 pizza    x $14.78   = $73.90
                    1 person    12 slices     1 pizza

7.

28 students x 3 pens      x 1 package x $1.44         = $15.12
                      1 student     8 pens          1 package

8.  13,406,190 pennies x 1 dollar          = $134, 061.90
                                         100 pennies

13,406,190 pennies x 4 grams   x 1 pound     = 118,116.211 lbs.
                                    1 penny      454 grams

Homework 9/8/15

1.  10 gal. x 3.8 Liters = 38 Liters
                     1 Gal.

2. 200.0 miles x 1.6 Km  = 320 Km
                          1 mile

3. 85 miles  x 1 hour   x 1 min.   x 5280 Feet   = 124.7 feet/sec.
    1 hour        60 min.     60 sec.     1 mile