Unit 3-7 Worksheet pages 172-203 NAME__________________________________ HR_____
1. Name, describe, and give an example of the three major divisions of the periodic table. (10 pts) 40 pts
Metals- elements to the left of the “stairs” on the periodic table
Nonmetals- elements to the right of the “stairs” on the periodic table
Metaloids(semimetals)- Elements touching the “stairs” on the periodic table
2. Calculate the % of each element in the following samples. (10 pts)
A) C6H12O6 B) C4Cl8
C- 6 X 12 =72 72/180x100 = 40% C=4 X 12=48 48/332 x100 = 14.5%
H- 12 X 1=12 12/180x100 = 6.67% Cl=8 X 35.5 =284 384/332 X 100= 85.5%
O- 6 X 16 =96 96/180x100 = 53.3% 48 + 284=332 g/mol
72 + 12 + 96=180 g/mol
3. Name the compounds and calculate the mass for the following: (10 pts)
A) S2N3 B) C4Cl8 C) F7O9
Disulfur Trinitride Tetracarbon Octachloride Heptaflourinenonaoxide
S=2x32=64 C=12X 4=48 F=7x19=133
N=3x14=42 Cl=8X35.5=284 O=9x16=144
64+42=106g/mol 48+284=332g/mol 133+144=277g/mol
4. Write the formula and calculate the mass for the following: (10 pts)
A) Pentaphosphorous Tetrabromide B) Selenium Trisulfide C) Heptaphosphorous Decaiodide
P5 Br4 Se1S3 P7I10
P= 5 X 31= 155 Se = 1 X 79 = 79 g/mol P= 7 X 31 = 217 g/mol
Br=4 X 80= 320 S= 3 X 32= 96 g/mol I = 10 X 127 = 1270 g/mol
155 + 320=475 g/mol 79 + 96 = 175 g/mol 217 + 1270 = 1487 g/mol