~ as was mentioned earlier, when two or more elements come together chemically, you get a compound....
TRANSCRIPT
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~ As was mentioned earlier, when two or more elements come together chemically, you get a compound. But, there are often numbers attached to different elements that mean specific things….scarrry things…
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CHEMICALFORMULAS
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WATER
H2O
HYDROGEN OXYGENTHIS SUBSCRIPT 2
MEANS THERE ARE
TWO (2) ATOMS OF
HYDROGEN IN WATER
Whenever you see a subscript number to the right of an element or atom, it means
There are that many atoms in the compound. BUT when no number is present, it
Is assumed that the number of atoms in the compound is just one (1)
Thus, in water there are 2 Hydrogen atoms and only
1 Oxygen
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H2O• Here is what it looks like:
O
H
H
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Try Some…
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NaCl (table salt)
How many of each in table salt?
Na (sodium) =
Cl (chlorine) =
1
1
Na Cl
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HClHydrochloric Acid
H (Hydrogen) =
Cl (Chlorine) =
1
1
How many
elements are
present in this
compound?
(Add the total in the
Formula)
2
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C6H12O6(Sugar)
C (Carbon) =
H (Hydrogen) =
O (Oxygen) =
6
12
6 Total = 24
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Be3Al2SiO6Emerald
• Write this formula down on your paper, identify the elements, how many of each, and the total number –
Beryllium (3), Aluminum (2), Silicon (1), Oxygen (6)Total = (12)
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Chemical Name Formulas
Element 1 Element 2 Totals
1 potassium fluoride
KF
2 calcium chloride
CaCl2
3 barium bromide BaBr2
4 silver sulfide
Ag2S
5 aluminum iodide
AlI3
6 potassium iodide
KI