Chapter 5.pptx - CHAPTER 5 MOLECULES AND COMPOUNDS Things...

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Things to Make. Things to Do. CHAPTER 5 MOLECULES AND COMPOUNDS
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LAW OF DEFINITE PROPORTIONS States that a chemical compound always contains the same proportions of elements by mass. AKA. Proust’s Law.
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LAW OF DEFINITE PROPORTIONS Your book refers to this law as the Law of Constant Composition.
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CHEMICAL FORMULAS Are representations of chemical compounds. A single line that shows the elements in a compound and the relative number of atoms of each element.
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CHEMICAL FORMULAS Are representations of chemical compounds. A single line that shows the elements in a compound and the relative number of atoms of each element. Contains chemical element symbols, numbers, and sometimes other symbols, such as parentheses, dashes, brackets, etc.
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WRITING CHEMICAL FORMULAS Elements are represented by their atomic symbol .
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WRITING CHEMICAL FORMULAS Elements are represented by their atomic symbol . How many atoms of an element are present is shown as a subscript . Subscripts never change for a given compound. Subscripts are always whole numbers.
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EXAMPLE What is the chemical formula of a compound that contains three atoms of hydrogen, one atom of phosphorus, and four atoms of oxygen?
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EXAMPLE What is the chemical formula of a compound that contains three atoms of hydrogen, one atom of phosphorus, and four atoms of oxygen? Hydrogen = H Subscript = 3 Phosphorus = P Subscript = 1 Oxygen = O Subscript = 4
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EXAMPLE
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EXAMPLE Subscript 1 is usually not shown. It is assumed that if you have the atomic symbol you have at least one atom of that element.
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EXAMPLE Subscript 1 is usually not shown. It is assumed that if you have the atomic symbol you have at least one atom of that element. P
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TYPES OF CHEMICAL FORMULAS There are three types of chemical formulas.
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TYPES OF CHEMICAL FORMULAS There are three types of chemical formulas. Empirical Molecular Structural
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EMPIRICAL FORMULA Give the simplest whole-number ration of atoms of each element in a compound.
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MOLECULAR FORMULA Gives the actual number of atoms of each element in a compound.
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STRUCTURAL FORMULA Uses lines to represent chemical bonds and shows how the atoms in a molecule are connected .
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MOLECULAR MODELS These are three-dimensional representations of molecules.
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EXAMPLES
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ELEMENTS AND COMPOUNDS
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  • Spring '16
  • RexJ.Gamble
  • Mole, Ion, compound

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