~ As was mentioned earlier, when two or more elements come together chemically, you get a compound. But, there are often numbers attached to different.

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Presentation transcript:

~ 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…

CHEMICAL FORMULAS

WATER H 2 O HYDROGENOXYGEN THIS 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

H2OH2O Here is what it looks like: O H H

Try Some…

NaCl (table salt) How many of each in table salt? Na (sodium) = Cl (chlorine) = 1 1 Na Cl

HCl Hydrochloric Acid H (Hydrogen) = Cl (Chlorine) = 1 1 How many elements are present in this compound? (Add the total in the Formula) 2

C 6 H 12 O 6 (Sugar) C (Carbon) = H (Hydrogen) = O (Oxygen) = Total = 24

Be 3 Al 2 SiO 6 Emerald 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)

ChemicalName Formulas Element 1 Element 2 Totals 1 potassium fluoride KF 2 calcium chloride CaCl2 3barium bromide BaBr2 4 silver sulfide Ag2S 5 aluminum iodide AlI3 6potassium iodide KI