Lecture: Molecules and Compounds

Compounds and Molecules: A chemical structure that is made of two or more atoms that are bonded together.

Examples of Compounds and Molecules H 2 O, O 3, Ba(OH) 2, and H 2 SO 4

The numbers after the Atomic Symbol tells you how many atoms of that element are needed to make the compound. No number after an Atomic Symbol is equal to 1.

H 2 SO 4 is made of the following elements and how many of that element are needed to build it. H: 2 S:1 O:4

Calculate the types of elements and number of each element to make the following compound. NH 3 OH

NH 3 OH N: Nitrogen =1 H: Hydrogen=4 O: Oxygen=1

CO is not the same as Co. CO is the compound carbon monoxide (1 carbon atom and 1 oxygen atom). Co is the element cobalt.

Mg(OH) 2 Mg O H

Mg(OH) 2 Mg: 1 O H

Mg(OH) 2 Mg: 1 O: 1 H

Mg(OH) 2 Mg: 1 O: 1 x 2= 2 H

Mg(OH) 2 Mg: 1 O: 1 x 2= 2 H: 1 x 2= 2

Complete this problem on your worksheet Homework Example: SO 2

Answer: Sulfur=1 Oxygen =2