You Will Need:1.Pencil, Text book Open to

P.T.2.Counting Atoms Bookshelf –3

sheets – 5 sides – Please Staple.

3.Log #4 – Update On-line4.Any missing work needs to

be turned in ASAP – Progress Notice on Thursday

1.Retakes for Test #3 – 91/130 or lower.

2.Retakes offered until Monday, April 18th

3.Get Test #3 Signed and Correct 5 errors – Tell why you missed:

#1, 20,21,22,32

Compound

Mixture of Elements & Compounds

Mixture of Elements

Compound

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

Trinitrotoluene = (TNT) explosive

C7H5(NO2)3

C= Carbon = 7

H = Hydrogen = 5

N = Nitrogen = 3

O = 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

16

SSulfu

r32.0

7

# of Protons# of Electrons if neutral

The SUM of Protons & Neutrons

Group # 1 2 13 14 15 16 17 18

Valence #

The periodic table can help us determine the valence of most of the elements on the

P.T.

1 2 3 4 5 6 7 8

Valence is the # of electrons in the outer most shell of the atom.

Element

Information Bohr Model Lewis Dot

Sulfur

Row:

# of Protons:

# of Neutrons:

# of Electrons:

3

16+32-16=1616-

P=16N=16

2 8 6 S

1. Counting Atoms – Due Tomorrow

2. Anything you still owe me….Progress Notice on Thursday

3. STAR Cumulative Quiz on Friday