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Chapter 4 “Chemical Names and Formulas”
H2O Chapter 4 “Chemical Names and Formulas” Modified and adapted from Pre-AP Chemistry Charles Page High School Stephen L. Cotton
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The student will: SWBAT’2
classify the type of bond that forms between two given elements. write the chemical symbol/name given the name/chemical symbol of an element. classify a given compound as ionic or molecular. given a sheet of common ions, represent an ionic compound in multiple ways--using words and chemical formula. represent a molecular compound in multiple ways-- using words, chemical formula and diagrams. represent the seven common diatomic molecules in multiple ways-- using words, chemical formula and diagrams.
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SWBAT Scale 4: Same as a 3.0 but I can make inferences & application to the SWBAT’s 3: I COMPLETELY understand all parts of the SWBAT 2: I understand MOST of the SWBAT’s with teacher help 1: I understand a little of the SWBAT’s but need teacher help 0: I do NOT understand any part of the SWBAT’s and need help!
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Section 4.3 Naming and Writing Formulas for Molecular Compounds
OBJECTIVES: Interpret the prefixes in the names of molecular compounds in terms of their chemical formulas.
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Section 4.3 Naming and Writing Formulas for Molecular Compounds
OBJECTIVES: Apply the rules for naming and writing formulas for binary molecular compounds.
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Video Watch Tyler Dewitt demonstrate how to write names for Molecular Compounds. Naming Covalent Molecular Compounds
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Molecular Compounds Compounds where both elements have neg. charges
both elements are from right side both element are non-metals electrons are shared, not transferred they generally have low MP & so can be a S/L/G
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Molecular compounds are…
made of just nonmetals smallest piece is a molecule can’t be held together by opposite charge attraction can’t use charges to figure out how many of each atom (there are no charges present)
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Molecular compounds are easier!
Ionic compounds use charges to determine how many of each. You have to figure out charges. May need to criss-cross numbers. Molecular compounds: the name tells you the number of atoms. Uses prefixes to tell you the exact number of each element present!
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Molecular Compounds Binary molecule Rules for naming binary molecules
2 atoms w/ covalent bond Rules for naming binary molecules 1st element has normal name 2nd element has ending changed to -ide Use prefixes to say how many of each element Do not use a prefix with the first element if there is only one. (ex. CO - carbon monoxide)
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Molecular Naming Prefixes
1 mono 6 hexa 2 di hepta 3 tri octa 4 tetra nona 5 penta deca
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Prefixes Prefix & name Prefix & name -ide
To write the name, write two words: Prefix & name Prefix & name -ide
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Prefixes To write the name, write two words: One exception is we don’t write mono if there is only one of the first element. Prefix name Prefix name -ide
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Prefixes Prefix name Prefix name -ide
To write the name, write two words: One exception is we don’t write mono if there is only one of the first element. Normally, we do not have double vowels when writing names (oa oo) Prefix name Prefix name -ide
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Name the compounds Formula Name CO2 CO PCl3 N2P4 SO4 N2O5 S4Cl9
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Name the compounds Formula Name CO2 Carbon Dioxide CO Carbon Monoxide
PCl3 Phosphorus Trichloride N2P4 Dinitrogen Tetraphosphide SO4 Sulfur Tetroxide N2O5 Dinitrogen Pentoxide S4Cl9 Tetrasulfur Nonachloride
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Write the formulas dinitrogen monoxide phosphourus trichloride
sulfur hexafluroride carbon disulfide carbon tetrabromide dinitrogen tetrahydride boron trichloride diphosphourus trioxide hexaselenium monochloride
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Write the formulas dinitrogen monoxide N2O
phosphourus trichloride PCl3 sulfur hexafluroride SF6 carbon disulfide CS2 carbon tetrabromide CBr4 dinitrogen tetrahydride N2H4 boron trichloride BCl3 diphosphourus trioxide P2O3 hexaselenium monochloride Se6Cl
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Molecular Compounds Diatomic molecules
2 of the same nonmetals covalently bonded are gases (ex. H2 = hydrogen gas)
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Yes PxQy P=H? Acid Compound No >2 Elements? Yes No Yes P=Metal? 2 of Same Elements? No Yes No Name Binary Molecule -use Prefixes Name Diatomic Molecule
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Practice by naming these:
= dinitrogen monoxide (also called nitrous oxide or laughing gas) N2O NO2 Cl2O7 CBr4 CO2 BaCl2 = nitrogen dioxide = dichlorine heptoxide = carbon tetrabromide = carbon dioxide (This one will not use prefixes, since it is an ionic compound!)
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Write formulas for these:
diphosphorus pentoxide tetraiodine nonoxide sulfur hexafluoride nitrogen trioxide carbon tetrahydride phosphorus trifluoride aluminum chloride (Ionic compound)
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Answers P2O5 I4O9 SF6 NO3 CH4 PF3 AlCl3
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The student will: SWBAT’2
classify the type of bond that forms between two given elements. write the chemical symbol/name given the name/chemical symbol of an element. classify a given compound as ionic or molecular. given a sheet of common ions, represent an ionic compound in multiple ways--using words and chemical formula. represent a molecular compound in multiple ways-- using words, chemical formula and diagrams. represent the seven common diatomic molecules in multiple ways-- using words, chemical formula and diagrams.
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SWBAT Scale 4: Same as a 3.0 but I can make inferences & application to the SWBAT’s 3: I COMPLETELY understand all parts of the SWBAT 2: I understand MOST of the SWBAT’s with teacher help 1: I understand a little of the SWBAT’s but need teacher help 0: I do NOT understand any part of the SWBAT’s and need help!
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