Presentation on theme: "Ch. 7 – Chemical Formulas & Chemical Compounds This chapter introduces methods for naming, writing, and identifying chemical compounds. Examples: CaCO."— Presentation transcript:
Ch. 7 – Chemical Formulas & Chemical Compounds This chapter introduces methods for naming, writing, and identifying chemical compounds. Examples: CaCO 3 – limestone, NaOH – lye, HCl – muriatic acid, NaCl – table salt, C 6 H 12 O 6 – glucose, C 12 H 22 O 11 – sucrose.
AAl 2 O 3 – How many Al? How many O? AAl 2 (SO 4 ) 3 – How many Al,S, & O? MMonatomic ions form from a single atom Ex. Na +, Cl -, Mg 2+ CCation- positive AAnion – Negative BBinary compounds are composed of 2 different elements. Ex. Sodium chloride, Barium sulfide
Naming Compounds NNew system of nomenclature (Stock System) Write the 1 st element’s name usually positive Write the 2 nd element’s name – use the suffix – ide If the 1 st element is a transition element (3-12) or an element with more than one charge, you need to place a roman numeral behind it to show its charge. Be able to recognize if some of the elements in the compounds are polyatomic ions. EXAMPLES: KI, Sr 2 F, CuCl, ZnS, Fe 2 O 3
OOld System of Nomenclature Instead of using roman numerals for elements with more than one charge, you use the following: –o–ous for the suffix of the element if it’s the lower charge. –i–ic for the suffix of the element if it’s the higher charge. –P–Pg. 20
NNomenclature is the method of naming chemical compounds. OOxyanions are polyatomic ions that contain oxygens Ex. OH -, SO 4 - NNumerical Prefixes (Table 7-3) – pg. 212 Ex. 2 –di, 3 – tri, 4 – tetra, 5 - pent BBinary compounds with prefixes: NO 2 – nitrogen dioxide N 2 O 5 - ?
Binary Acids & Oxyacids Binary acids are solutions of binary compounds with hydrogen at the beginning. Ex. HCl, HF, HBr Oxyacids contain H,O, and a third element. Ex. HNO 3, H 2 CO 3, H 2 SO 4, H 3 PO 4