Your cell phone should be away during all times today.

Learning Intentions

• You can determine how many atoms of each type of atom are in a formula

• You can determine the atomic weight/mass of each type of atom in the formulas and add up all the weights/masses to get formula mass for the substance.

• You can describe what percent composition is and how to calculate it.

• You can define a mole and explain why it is used in chemistry.

Content Standards being covered:

*Student understands what the letters and numbers stand for in a compound formula, can use those letter and numbers to determine how many of each type of element there are in a formula.
101. A compound’s formula will describe which elements are present in the compound and how many atoms of each.
102. In a compound, the subscript after an element will describe the number of atoms of that element only
103. If a subscript is placed on the outside of a parentheses that contains more than one element, the subscript will apply to all of the atoms within the parentheses
104. A coefficient placed in front of a compound describes the total number of that entire compound present
107. The total mass of a compound is the sum of all of the atom’s masses that make up the compound

Habits of Mind/Life skills being covered:

Thinking and Communicating with Clarity

Making Connections with Past Knowledge

Journal Entry:

What is the formula weight of H₂O?