Definitions
What are the 2 ways an element can be shown in a chemical formula.
With only a capital letter or a capital and a lowercase letter
How many total atoms are represented in the formula shown below?
C2H5OH
9 total atoms
True or False?
Formula B has 7 more atoms than formula A.
Formula A:
CH(NaO3)
Formula B:
2 Al2(SO4)3
True
Which of the following chemical formulas contains 7 total atoms?
A) Fe(OH)3
B) Au(CN)2
C) Ti(OH)4
A
List your elements and count your atoms.
4Al(OH)3
Al- 4
O- 12
H- 12
What is the subscript?
The small number behind an element that tells us how many atoms of that element there are.
How many elements are present in the following formula?
CH3COOH
3 total atoms
True or False?
Ferrocene has 10 more atoms than diacetyl.
Ferrocene Diacetyl
(C5H5)2Fe
Diacetyl
(CH3CO)2
False, it has 9 more
Which of the following compounds is made up of the most atoms?
Radon Acetate: Rn(CH3COO)2
Cobalt(II) Nitrate: Co(NO3)2
Scandium Sulfate: Sc2(SO4)
Scandium Sulfate
List your elements and count your atoms.
5Al2(Si2O3)2
Al- 10
Si- 20
O- 30
What is the coefficient?
The big number at the beginning of a chemical formula, that gets multiplied to everything behind it.
Which of the following chemical formulas contains 8 total atoms?
A) C2H5OH
B) NH4NO3
C) C2H4O2
C) C2H4O2
How many atoms of each element are in one molecule of the compound shown below?
Fe(H2O)4(OH)2
iron = 1; hydrogen = 10; oxygen = 6
Which chemical formula shown below contains the fewest oxygen atoms?
I. K2SO4
II. H2O2
III. Ca(C2H3O2)2
Formula 2
List your elements and count your atoms.
5Mg3(PO4)2
Mg- 15
P- 10
O- 40
Reactants
Arrow
Products
How many atoms of each element are in one molecule of copper(II) phosphate?
Cu3(PO4)2
copper = 3
phosphorus = 2
oxygen = 8
Which chemical formula shown below contains the most hydrogen atoms?
Formula X = Ba(OH)2
Formula Y = (NH4)2SO4
Formula Z = Co(OH)2
Formula Y
How many atoms of each element are in one molecule of the compound shown below?
Fe(H2O)4(OHFe)2
Fe- 3
H- 10
O- 6
List your elements and count your atoms.
5Al(C2H3O2)2
Al- 5
C- 20
H- 30
O- 20
The law that states in a chemical formula, what is on one side of the arrow has to also be on the other side.
How many more oxygen atoms are represented in formula I than in formula II?
Formula I:
Fe(NO3)2
Formula II:
3 Fe(OH)3
3
How many atoms are represented in the formula shown below?
Ni(CH3CO2)2
15 atoms
List the elements and count your atoms.
9MgSO4
Mg- 9
S- 9
O- 36
Total: 54
List your elements and count your atoms.
3(NH4)2Cr2O7
N- 6
H- 24
Cr- 6
O- 21