Day 8­Counting Atoms.notebook
March 24, 2017
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Day 8­Counting Atoms.notebook
March 24, 2017
Atoms and Molecules Page 46
O
H
H
Recall
Atom: a particle in an element. Example: In water there are two hydrogen atoms and one oxygen atom.
Molecule: a combination of two or more atoms. Molecules can be made up of all the same kind of atom like O2 or different atoms like H2O.
O
H
H
2
Day 8­Counting Atoms.notebook
March 24, 2017
Naming Elements Assignment
1) Using your periodic table, write the element's name that is associated with the symbols. a) S Sulfur
b) F
Fluorine
c) Al
Aluminum
d) Cu
e) Br
Copper
Bromine
f) Na
Sodium
g) H
Hydrogen
h) Fe
Iron
i) O
Oxygen
j) Li
Lithium
2) Given the following elements name's write the symbol that is associated with them.
a) Calcium
Ca
f) Chlorine
Cl
Au
b) Carbon
C
g) Gold
c) Nickel
Ni
h) Magnesium d) Neon
Ne
i) Nitrogen e) Silver
Ag
j) Potassium
Mg
N
K
3
Day 8­Counting Atoms.notebook
March 24, 2017
lets vısualıze some molecules and
compounds
H 2O
O
H
H
This Molecule contains: 2 Hydrogen atoms 1 oxygen atom Total atoms: 3 atoms 4
Day 8­Counting Atoms.notebook
March 24, 2017
lets vısualıze some molecules and
compounds
NO3
O
O
N
O
This Molecule contains: 1 Nitrogen atom 3 oxygen atoms Total atoms: 4 atoms 5
Day 8­Counting Atoms.notebook
March 24, 2017
lets vısualıze some molecules and
compounds
C 6H 6
H
H
C
H
C
C
C
C
H
H
C
H
This Molecule contains: 6 Carbon atoms 6 Hydrogen atoms Total atoms: 12 atoms 6
Day 8­Counting Atoms.notebook
March 24, 2017
RULES FOR COUNTING ATOMS
1) SUBSCRIPTS only refer to the atom that they are BEHIND. Example:
H2S
Contains: 2 Hydrogen atoms 1 Sulfur atoms Total atoms: 3 atoms 7
Day 8­Counting Atoms.notebook
March 24, 2017
RULES FOR COUNTING ATOMS
2) COEFFICIENTS apply to the entire compound. You MULTIPLY the coefficients and SUBSCRIPTS.
Example: 2 H2S
H 2S H 2S
Contains: IF THERE ISN’T A SUBSCRIPT BEHIND AN ELEMENT, ASSUME THERE IS ONLY ONE ATOM OF THAT ELEMENT!
4 Hydrogen atoms 2 Sulfur atoms Total atoms: 6 atoms 8
Day 8­Counting Atoms.notebook
March 24, 2017
RULES FOR COUNTING ATOMS
3) If elements or compounds are inside of BRACKETS, then the SUBSCRIPT behind the parentheses applies to everything inside.
Ba(OH)2
Example:
ATOMS OF BARIUM: 1
ATOMS OF OXYGEN: 2
ATOMS OF HYDROGEN: 2
Total of Atoms= 5 9
Day 8­Counting Atoms.notebook
March 24, 2017
LET’S PRACTICE!
MgCl2
Atoms of Magnesium:
Atoms of Chlorine:
Total of Atoms = 10
Day 8­Counting Atoms.notebook
March 24, 2017
LET’S PRACTICE!
Al2S3
Atoms of Aluminum:
Atoms of Sulfur:
Total of Atoms = 11
Day 8­Counting Atoms.notebook
March 24, 2017
LET’S PRACTICE!
H2SO4
Atoms of Hydrogen:
Atoms of Sulfur:
Atoms of Oxygen: Total of Atoms = 12
Day 8­Counting Atoms.notebook
March 24, 2017
LET’S PRACTICE!
CH3OH
Atoms of Carbon:
Atoms of Hydrogen:
Atoms of Oxygen: Total of Atoms = 13
Day 8­Counting Atoms.notebook
March 24, 2017
LET’S PRACTICE!
Ca3(PO4)2 Atoms of Calcium:
Atoms of Phosphorus:
Atoms of Oxygen: Total of Atoms = 14
Day 8­Counting Atoms.notebook
March 24, 2017
LET’S PRACTICE!
Al2(SO4)3
Atoms of Aluminum:
Atoms of Sulfur:
Atoms of Oxygen: Total of Atoms = 15
Day 8­Counting Atoms.notebook
March 24, 2017
LET’S PRACTICE!
2Ca3(PO4)2 Atoms of Calcium:
Atoms of Phosphorus:
Atoms of Oxygen: Total of Atoms = Atoms of Calcium:
Atoms of Phosphorus:
Atoms of Oxygen: Total of Atoms = 16
Day 8­Counting Atoms.notebook
March 24, 2017
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Day 8­Counting Atoms.notebook
March 24, 2017
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Day 8­Counting Atoms.notebook
March 24, 2017
4
8
6
4
12
30
8
24
Total = 42
Total = 32
8
Total = 24
4
12
Total = 26
16
16
1
Total = 24
12
4
6
12
Total = 24
12
12 3
3
3
10
30
105
4
14
14
8
12 6
2
9
10
total = 21
4
10
12
Total = 145
Total =20
15
9
Total = 18
Total = 28
48
2
Total = 28
9
12
6
Total= 15
total = 66
6
Total = 10
36
Total = 54
30
36
Total= 50
Total= 52
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Day 8­Counting Atoms.notebook
March 24, 2017
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32
40
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