You Will Need:1. Progress Notice Due Today2. Complete Oral Presentations

Today

1.Atom Model • Describe materials used to make model• Tell # of protons, neutrons and

electrons• Tell What type of Atom• Tell What state at room temp.

2.Your ELEMENT• Talk to us about your element using

your visual presentation

You Will Need:1. Pencil, 2. Colored Pencils (5 minimum)3. Text book Open to P.T.4. Counting Atoms Bookshelf –

2sheets – 3 sides – Please Staple.

5. Log #4 – Update On-line

The formula for a compound indicates the elements that make up the compound and the number of atoms of each element present in that specific compound. These numbers of atoms are indicated by the use of small numbers called subscripts.

Sometimes groups of atoms act as a group of atoms. Such a group of atoms is called a polyatomic ion.

When a subscript appears outside the parentheses, it indicates that all the elements inside the parentheses should be multiplied by that subscript.

Fe(OH)3

• Calcium Carbonate = Limestone

CaCO3

Ca = Calcium = 1

C = Carbon = 1

O = Oxygen = 3

• Magnesium Hydroxide

Mg(OH)2

Mg = Magnesium= 1

O = Oxygen= 2

H = Hydrogen= 2

Trinitrotoluene = (TNT) explosive

C7H5(NO2)3

C= Carbon = 7H = Hydrogen = 5N = Nitrogen = 3O = Oxygen = 6

As you look over these compounds you may observe that many of them contain similar _________ of elements. Since we are a ______________ based environment, carbon is found in all living organisms. The elements in the Human Body can be broken down to include the main elements of Hydrogen, Oxygen, Nitrogen, Carbon and representatives from about 20 other elements.

atomscarbon

The _________ main elements that make up most living organisms are Carbon, ________________, Sulfur, __________________, Oxygen and _____________.

Phosphorus

SIX

HydrogenNitrogen

•Mass Unit Label =_______________

•Volume Unit Labels = ________, _______ or _______as a unit label

•Density unit label = ___________, ________ or __________

grams

mLcm3

cc

g/cm3

g/mL g/cc

5 points given:• 2 points for the problem you

are inputting into the calculator

• 2 points for the answer rounded to the nearest hundreth

• 1 point for the unit label

1. Counting Atoms – Due by the end of the period tomorrow

2. Anything you still owe me….