- Use the STEM NAME of the element, then add "-ide" suffix
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1 65 ANIONS 2 kinds Main-group nonmetals - Use the STEM NAME of the element, then add "-ide" suffix N : "nitride" ion P : "phosphide ion" O : "oxide ion" F : "fluoride ion" Polyatomic ions - Memorize list.(see web site) C H O : "acetate ion" SO : "sulfate ion" NO : "nitrate ion" SO "sulfite ion" NO : "nitrite ion" * Polyatomic ions ending in "-ate" and "-ite" suffixes always contain oxygen! "-ate" ions have more oxygen atoms than their "-ite" counterparts.
2 66 NAMING IONIC COMPOUNDS - The name of the compound is based on the name of the ions in the compound - Cation first, anion second Examples: magnesium hydroxide iron(iii) oxide sodium sufide copper(ii) oxide beryllium bromide copper(i) oxide Remember to include the Roman numeral for CHARGE in the name of transition metal compounds! Page 63 (9th edition): Chart of polyatomic ions
3 67 NAMING IONIC COMPOUNDS ammonium sufide iron(ii) carbonate barium phosphate titanium(iv) sulfide Spelling matters! calcium nitrate barium phosphide
4 68 DETERMINING THE FORMULA OF AN IONIC COMPOUND FROM THE NAME - The name of an ionic compound is made of the names of the CATION and ANION in the compound. - To get the FORMULA, you must figure out the SMALLEST RATIO of cation to anion that makes the charges balance out Examples: iron(iii) carbonate potassium sulfide calcium bromide
5 69 sodium sulfate DETERMINING IONIC FORMULAS strontium oxide tin(ii) phosphate chromium(iii) nitrate barium hydroxide titanium(iv) chloride Don't forget the parenthesis when you have more than one hydroxide ion!
6 70 HYDRATES - many ionic compounds are formed by crystallizing the compound from water. Sometimes, this causes water molecules to become part of the crystal structure. - This water is present in a definite ratio to the ions in the compound. Can be removed by heating, but will NOT evaporate if the compound is left standing. # water molecules per formula unit of compound dot indicates that the water is weakly bound to the ionic compound - many DESSICANTS are hydrates that have had their water molecules driven off. They will slowly reabsorb water from the air (and keep the environment in a dessicator at a low humidity) - Hydrates are named using the name of the ionic compound, and a Greek prefix in front of the word "hydrate" to indicate how many water molecules are associated Why "copper(ii)"?
7 71 MOLECULAR COMPOUNDS - There are several kinds of molecular compound. We will learn to name two simple but important classes BINARY MOLECULAR COMPOUNDS - molecular compounds containing only two elements ACIDS - molecular compounds that dissolve in water to release H ions - corrosive to metals (react with many to produce hydrogen gas) - contact hazard: can cause chemical burns to eyes and skin - sour taste - turn litmus indicator RED - two kinds of acids: BINARY ACIDS - contain hydrogen and one other element OXYACIDS - contain hydrogen, OXYGEN, and another element
8 72 BINARY MOLECULAR COMPOUNDS - Named based on the elements they contain, plus prefixes to indicate the number of atoms of each element in each molecule FIRST ELEMENT - Add a GREEK PREFIX to the name of the element. - Omit the "MONO-" (1) prefix if there is only one atom of the first element SECOND ELEMENT - Add a GREEK PREFIX to the STEM NAME of the element - Add the suffix "-ide" (as if you were naming an anion) - DO NOT omit the "mono-" prefix if there is only one atom of the second element MEMORIZE THE GREEK PREFIXES. SEE COURSE WEB SITE FOR A LIST! THESE ARE THE SAME PREFIXES USED FOR THE HYDRATES!
9 73 BINARY MOLECULAR COMPOUNDS Examples: boron trifluoride dichlorine heptaoxide (or dichlorine heptoxide) carbon monoxide *Note: metalloids like boron behave chemically like nonmetals do. carbon dioxide carbon tetrachloride dihydrogen monoxide dinitrogen tetrafluoride magnesium CHLORIDE (NOT magnesium DIchloride!) Magnesium chloride is an ionic compound and is named using the system we discussed for naming ionic compounds. How can we tell that this compound is ionic? It's a metal joined with a nonmetal.
- Use the STEM NAME of the element, then add "-ide" suffix
65 ANIONS 2 kinds Main-group nonmetals - Use the STEM NAME of the element, then add "-ide" suffix N : "nitride" ion P : "phosphide ion" O : "oxide ion" F : "fluoride ion" Polyatomic ions - Memorize list.(see
- Some MOLECULES can gain or lose electrons to form CATIONS or ANIONS. These are called POLYATOMIC IONS
63 POLYATOMIC IONS - Some MOLECULES can gain or lose electrons to form CATIONS or ANIONS. These are called POLYATOMIC IONS - Polyatomic ions form ionic compounds in the same way that single-element ions
- Some MOLECULES can gain or lose electrons to form CATIONS or ANIONS. These are called POLYATOMIC IONS
63 POLYATOMIC IONS - Some MOLECULES can gain or lose electrons to form CATIONS or ANIONS. These are called POLYATOMIC IONS - Polyatomic ions form ionic compounds in the same way that single-element ions
NAMING IONIC COMPOUNDS
NAMING IONIC COMPOUNDS iron(ii) carbonate ammonium sulfide titanium (IV) sulfide barium phosphate Spelling matters! calcium nitrate sodium phosphide DETERMINING THE FORMULA OF AN IONIC COMPOUND FROM THE
NAMING IONIC COMPOUNDS. ammonium sulfide. iron(ii) carbonate. barium phosphate. titanium(iv) sulfide. Spelling matters!
67 NAMING IONIC COMPOUNDS ammonium sulfide iron(ii) carbonate titanium(iv) sulfide barium phosphate Spelling matters! barium phosphide 68 DETERMINING THE FORMULA OF AN IONIC COMPOUND FROM THE NAME - The
DETERMINING THE FORMULA OF AN IONIC COMPOUND FROM THE NAME
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DETERMINING IONIC FORMULAS strontium oxide
69 sodium sulfate DETERMINING IONIC FORMULAS strontium oxide tin(ii) phosphate chromium(iii) nitrate barium hydroxide titanium(iv) chloride When adding a subscript to a polyatomic ion, put the polyatomic
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DETERMINING IONIC FORMULAS strontium oxide
69 sodium sulfate DETERMINING IONIC FORMULAS strontium oxide tin(ii) phosphate chromium(iii) nitrate barium hydroxide titanium(iv) chloride Note: Be careful when adding subscripts to HYDROXIDE, CYANIDE,
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