Tuesday, September 22, 2015

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.

Monday, September 21, 2015

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

Thursday, September 17, 2015

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

Wednesday, September 16, 2015

Homework 9/11/15

1.
2 unpaired electrons
2. 1s2 2s2 2p6 3s2 3p5 or [Ne] 3s2 3p5
3. 1s2 2s2 2p6 3s1

Monday, September 14, 2015

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

Wednesday, September 9, 2015

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    

Wednesday, September 2, 2015

Unit 1 Review

1.   Draw a simple flow chart outlining the steps of the scientific method. Include what happens if the experiment does not agree with the hypothesis.

2. What are the metric units used to measure length/distance, mass, volume, temperature, and time? What are their abbreviations?

3. Write the following numbers in scientific notation.
A.    25,030,000
B.    0.000258
C.    34,003,000,000,000
D.    0.00000000314

4.  Do the following conversions.
A.     Convert 100 milliliters into liters.
B.     Convert 450 grams into milligrams.
C.     Convert 320 centimeters into meters.
D.     Convert 4 kilograms into grams.
E.     Convert 5,930 liters into milliliters.

5. How many significant figures are in the following numbers?
A.     422.002
B.     50.20
C.     50,000,000,000
D.     599
E.     93.0

6. Solve the following problems with answers with the correct number of significant figures
A.     10.5 * 22
B.     60.0 + 22.543
C.     533.215 – 255.01
D.     5586.251 / 5.2
E.     525 + 22.156
F.     22.2 * 562.12
G.     633.1 – 52.256

7. Are the following chemical or physical changes?
A.     Ice melting
B.     Gasoline burning
C.     Table salt (sodium chloride) dissolving in water
D.     Iron rusting
E.     Breaking a glass
F.     Protein being digested into amino acids

8. What are the three subatomic particles that atoms are made of and what are their charges?

9.   If an atom has twenty six protons, thirty neutrons, and twenty six electrons what is its atomic number? What is its atomic weight? What element is it? What is its symbol?

10. Which are heavier electrons or protons?

11. Are the following elements metals, nonmetals or semimetals?
A. Cobalt (Co)
B. Xenon (Xe)
C. Boron (B)
D. Calcium (Ca)
E. Oxygen (O)
F. Tungsten (W)

Homework 9/1/15

Classify the following elements as metals, non-metals, or metaloids:
A. Calcium - metal
B. Florine - non-metal
C. Germanium - metaloid
D. Palladium - metal
E. Xenon - non-metal

To what group do the following elements belong?
A. Sodium - Group 1 Alkali Metal
B. Zirconium - Group 4 Transition Metal
C. Cerium - Lanthanide
D. Iodine - Group 17 Halogen
E. Krypton - Group 18 Noble Gasses

Tuesday, September 1, 2015

Crash Course Periodic Table Video

Homework 8/31/15

1. A chemical change involves a chemical reaction where new substances are created. In a physical change the substance or substances involved stay the same, just change form.

2. A. Physical Change
    B. Chemical Change
    C. Physical Change
    D. Chemical Change