Atoms Airs and Chemical Bonding

Topics: Atom, Oxygen, Chemical element Pages: 4 (490 words) Published: February 22, 2015


Atoms, Airs, and Chemical Bonding
Rich McConnell, CH-201
Grantham University
Atoms, Airs, and Chemical Bonding
1. Alcohol in our digestive system reacts with oxygen gas to form carbon dioxide and water.  How many grams of carbon dioxide are released if a 10.00 g alcohol sample reacts with 20.85 g of oxygen gas and produces 11.77 g of water? Answer: 19.08g CO2

2. Using the periodic table, fill in the missing information in the following table: Protons
Neutrons
Electrons
Isotope Symbol
27 
32 
27 
5927CO
76
124
76 
200
76 OS 



14C
21
24
21
45
21Sc 
3. Give the number of valence electrons for each of the following: 1. Ba--2
2. Al--3
3. P--5
4. Se--6
5. Br--7
6. K--1
4. Give short definitions for the following terms:
1. Atomic number—the ratio of the average mass of molecules to the twelfth of the mass of one atom. 2. Mass number---number of neutron and protons in an atomic nucleus 3. Atomic weight—the average mass of an atom of an element 4. Isotope—one of two or more atoms having the same atomic number, but different mass numbers 5. Natural abundance—the amount of isotopes of a chemical element as naturally found on a planet 6. Atomic mass unit—also known as Dalton (symbol: Da) standard unit for measuring or indicating mass on an atomic or molecular scale. 5. Complete the following table:

Isotope
Atomic No.
Mass No.
No. of Protons
No. of Neutrons
No. of Electrons
Bromine-81
35 
81
35 
 45
35 
Boron-11
5
10.811 

 6

  Cl
17
35.4527 
17
18
17
52Cr
24 
52
24
28
24
Ni-60
58
58.6934
 28
31
28
Sr-90
38 
87.62
38
50 
38
Lead-206
82 
207.2
82
125
82
6. Explain how ozone is formed in the troposphere. Ozone production from NOx pollutants: Oxygen atoms freed from nitrogen dioxide by the action of sunlight attack oxygen molecules to make ozone to reform nitrogen dioxide, and the cycle repeats. 7. Write the equation for the reaction that occurs when...
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