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Binary Compound A compound made up of two parts, a positive part and a negative part H2OH2O
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The positive part is always written first Binary Compound H2OH2O
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The negative part is always written second Binary Compound H2OH2O
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Examples: NH 4 OHNaCl CO 2 H 2 SO 4 Mg(OH) 2 Binary Compound
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Chemical Formula A shorthand method of representing the makeup of chemicals... H2OH2O
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using chemical symbols and oxidation numbers. Chemical Formula H2OH2O
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C 6 H 12 O 6 Chemical Formula
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(NH 4 ) 2 SO 4 Chemical Formula
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Oxidation Number The apparent charge on an atom. The charge on an ion.
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Tells the number of electrons gained or lost when forming compounds. Oxidation Number
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Atoms with positive oxidation numbers lose electrons. Oxidation Number Na +
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Metals commonly have positive oxidation numbers. Oxidation Number Na +
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Atoms with negative oxidation numbers gain electrons. Oxidation Number Cl -
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Nonmetals commonly have negative oxidation numbers. Oxidation Number Cl -
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The sum of the oxidation numbers in a chemical formula is equal to zero. Oxidation Number Na + Cl -
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Subscripts Small numbers to the lower right of a chemical symbol. H2OH2O
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Represent the number of atoms of the element in the compound. H2OH2O Subscripts
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Subscripts of 1 are never used, they are understood. H2OH2O Subscripts
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Multiply the subscript by the oxidation number. H2OH2O Subscripts
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H2OH2O Hydrogen: Oxidation # X Subscript + 1 X 2 = + 2
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H2OH2O Oxygen: Oxidation # X Subscript - 2 X 1 = - 2
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H2OH2O Total Oxidation Number: ( + 2 ) + ( - 2 ) = 0
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A Simplification Make the oxidation of one element the subscript of the other element.
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There is one possible problem! CaO +2 -2 Ca 2 O 2 A Simplification
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There is one possible problem! These subscripts will reduce... CaO +2 -2 Ca 2 O 2 A Simplification
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Subscripts MUST be written in their lowest form. CaO A Simplification
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What is the formula of the compound formed when magnesium and chlorine combine? Example:
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What is the formula of the compound formed when magnesium and chlorine combine? Example: MgCl 2
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What is the formula of the compound formed when sulfur and potassium combine? Example:
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What is the formula of the compound formed when sulfur and potassium combine? Example: K2SK2S
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What is the formula of the compound formed when oxygen and aluminum combine? Example:
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What is the formula of the compound formed when oxygen and aluminum combine? Al 2 O 3 Example:
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Ion An atom (or atoms) with a charge.
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Ion Meaning the number of protons and electrons is no longer the same.
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Ion Chemists cannot change an atom's protons, so it must be the electrons that change.
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H + O -2 Mg +2 P -3 Ion This atom has lost __ e -
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H + O -2 Mg +2 P -3 Ion This atom has gained __ e -
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H + O -2 Mg +2 P -3 Ion This atom has lost __ e -
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H + O -2 Mg +2 P -3 Ion This atom has gained __ e -
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A group of covalently bonded atoms with an overall charge. Polyatomic Ion
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NEVER change the subscripts in a polyatomic ion. Polyatomic Ion
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If more than one is needed in a formula, put parenthesis around the ion... Polyatomic Ion
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and add the subscript outside the parenthesis. Polyatomic Ion
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( NH 4 ) 2 SO 4 Polyatomic Ion
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What is the formula of the compound formed when calcium combines with the nitrate ion? Example:
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What is the formula of the compound formed when calcium combines with the nitrate ion? Example: Ca(NO 3 ) 2
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What is the formula of the compound formed when zinc combines with the sulfate ion? Example:
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What is the formula of the compound formed when zinc combines with the sulfate ion? Example: ZnSO 4
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What is the formula of the compound formed when the ammonium and phosphate ions combine? Example:
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What is the formula of the compound formed when the ammonium and phosphate ions combine? Example: (NH 4 ) 3 PO 4
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The sum of the oxidation numbers in a polyatomic ion is equal to the charge on the ion. Polyatomic Ion
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What is the formula for the sulfate ion?
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SO 4 -2 Polyatomic Ion The Sulfate Ion
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SO 4 -2 Polyatomic Ion This oxidation number must be positive.
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SO 4 -2 Polyatomic Ion This oxidation number must be negative.
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SO 4 -2 Polyatomic Ion The total of the oxidation numbers must equal this charge.
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SO 4 -2 oxygen -2 X 4 = -8 + sulfur = ? = -2 Polyatomic Ion
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SO 4 -2 oxygen -2 X 4 = -8 + sulfur = +6 = -2 Polyatomic Ion
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What is the formula for the compound formed when zinc combines with the perchlorate ion?
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Zn(ClO 4 ) 2
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What is the oxidation number of chlorine in this compound?
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Zn(ClO 4 ) 2 Zn is +2 X 1 = +2
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Zn(ClO 4 ) 2 Zn is +2 X 1 = +2 O is -2 X 4 X 2 = -16
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Zn(ClO 4 ) 2 Zn is +2 X 1 = +2 O is -2 X 4 X 2 = -16 Cl's total must be +14
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Zn(ClO 4 ) 2 Zn is +2 X 1 = +2 O is -2 X 4 X 2 = -16 Cl's total must be +14 There are 2 Cl's, each one = +7
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Lab Question: Does steel wool weigh more or less after burning.
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A combustion reaction is defined as a hydrocarbon combining with oxygen to produce carbon dioxide and water. Combustion CH 4 + 2O 2 CO 2 + 2H 2 O
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Metallic substances combine with oxygen in oxidation-reduction reactions, such as the rusting of iron. Combustion 4Fe + 3O 2 2Fe 2 O 3
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Do these two reactions suggest that anything that burns is actually combining with oxygen in the atmosphere? Combustion 4Fe + 3O 2 2Fe 2 O 3 CH 4 + 2O 2 CO 2 + 2H 2 O
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Steel wool is commonly purchased as pads formed from very thin metal threads. These pads are used as abrasives. Combustion coarse - medium - fine
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Is it possible that these metal threads would burn? Combustion coarse - medium - fine
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An impressive pyrotechnic display using steel wool.
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Naming Binary Compounds Chemical Names
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First: Write the name of the positive element. Chemical Names
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Then: Write the name of the negative element... Chemical Names
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with an ide ending. Chemical Names
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Examples: NaCl CaI 2 Li 4 C Chemical Names
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Examples: NaCl Sodium chloride CaI 2 Li 4 C Chemical Names
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Examples: NaCl Sodium chloride CaI 2 Calcium iodide Li 4 C Chemical Names
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Examples: NaCl Sodium chloride CaI 2 Calcium iodide Li 4 C Lithium carbide Chemical Names
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Compounds Containing Polyatomic Ions Chemical Names
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First: Write the name of the positive element or ion. Chemical Names
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Then: Write the name of the negative part... Chemical Names
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Then: If the negative part is a polyatomic ion, write the name with no changes... Chemical Names
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Then: If the negative part is an element, write the name with an ide ending as usual. Chemical Names
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Examples: MgSO 4 CaCO 3 NH 4 Cl Chemical Names
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Examples: MgSO 4 Magnesium sulfate CaCO 3 NH 4 Cl Chemical Names
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Examples: MgSO 4 Magnesium sulfate CaCO 3 Calcium carbonate NH 4 Cl Chemical Names
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Examples: MgSO 4 Magnesium sulfate CaCO 3 Calcium carbonate NH 4 Cl Ammonium chloride Chemical Names
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With Roman Numerals Chemical Names
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If the positive element has more than one possible oxidation number... Chemical Names
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or if it is out of character, its oxidation number is shown... Chemical Names
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with a Roman numeral in parenthesis after its name. Chemical Names
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Examples: lead (IV) oxide nitrogen (III) fluoride copper (I) chloride Chemical Names
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Examples: lead (IV) oxide PbO 2 nitrogen (III) fluoride copper (I) chloride Chemical Names
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Examples: lead (IV) oxide PbO 2 nitrogen (III) fluorideNF 3 copper (I) chloride Chemical Names
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Examples: lead (IV) oxide PbO 2 nitrogen (III) fluorideNF 3 copper (I) chlorideCuCl Chemical Names
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The "Big 3" industrial acids: Chemical Names
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The "Big 3" industrial acids: Chemical Names
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The "Big 3" industrial acids: Chemical Names
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