Vocabulary
How do you identify an element?
Look for a capital letter
How many elements? What are they?
NaOH
3, Na, O, H
How many total atoms?
Cu2S3O4
9
How many elements are in Ca(OH)2
3 elements
13 total atoms
3 total elements
What does a subscript in a chemical formula tell you?
the number of atoms
Which is the element in this equation?
c+He+H20
He
How many total atoms?
Li4Fe IS6 NaCHOS
17
4 elements
9 total atoms
3 total elements
Molecules are also known as what C name
Coefficient
How many different elements?
H2COCH2
3
In CO2, how many oxygen atoms are present per molecule?
2
4 elements
43 total atoms
3 total elements Al, S, O
2 or more elements is called what?
Compound
Which is the compound in the following equation?
He+cO2+LiFe
LiFe
How many total atoms are in 3CO2 molecules?
9 total atoms
How many elements are in the chemical formula Ca3(PO4)2?
3 elements
39 total atoms
3 total elements
Describe, in student-friendly language, how to count atoms in a formula that includes parentheses (example: Al2(SO4)3)
In Al2(SO4)3, Al2 is outside the parethesis so you have 2 Aluminums, then multiply 3 × 4 oxygens = 12 oxygens; multiply 3 × 1 sulfur = 3 sulfurs.
What is the compound of carbon dioxide?
What is the compound of table salt?
C02, NaCl
In 4Al2(SO4)3, how many sulfur atoms are present?
S=12 atoms
How many different elements are in the chemical formula NH4Fe(SO4)2H2O
5 elements
How many total atoms and total elements are in the following chemical formula
3Ca2Al(P2O4)2
45 total atoms
4 total elements