chemical formulas by: mr. castillo & mr. buenrostro
TRANSCRIPT
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Chemical Formulas
By: Mr. Castillo & Mr. Buenrostro
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Chemical Formulas
• We previously learned compounds are made of two or more different elements.
• Also, that molecules are the smallest unit of a compound.
• With the periodic table of elements we learned the chemical symbols or letters.
• Now, we will learn how to read compounds by learning about the chemical language made of chemical words called Formulas.
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Chemical Formulas• Chemical formula: shorthand method for
writing the number of atoms and type of elements in a compound.
• A chemical formula is a recipe for a substance.C6H12O6: Glucose
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Chemical Formulas• Chemical formula: identify substances and
determines the number of atoms of each element.
• Example: CH4, CO2, H2O, H2O2
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Formula symbols
• Elements are written with letter symbolsCO: C= carbon, O= oxygen
HI: H= hydrogen, I= Iodine• The first letter is always uppercase. The
second letter is lowercase.HCl: H= hydrogen, Cl= chlorine
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Subscripts
• Subscript: lower (bottom) number that determines the number of atoms in a formula.
• C2H3: C= 2 atom, H= 3 atoms• H2SO4: H= 2 atoms, S= 1 atom, O= 4 atoms• If no subscript number is present the
elements value is 1; as in S above.
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Subscripts
• Subscript: Below, under, or beneath• A subway station is below ground.• A submarine is under water.• A subatomic particle is below the Atoms level.
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• Determine the number of elements and atoms present in each formula.
• CH3
C= 1 atom H= 3 atoms 2 elements• HCl
H= 1 atom Cl= 1 atom 2 elements• H2SO4
H= 2 atom S= 1 atom O= 4 atom 3 elements
Formula Practice
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Review
• Any questions???