Lesson 7-Naming Chemical Compounds and Drawing LEDS PDF

Naming Chemical compounds And Drawing Lewis Electron Dot Structure Prepared by: Abegail B. Palcongan Learning Targets At the end of the lesson you are able to: identify what type of chemical bond is formed between atoms; name the given chemical formula; and draw the LEDS of atoms...

Naming Chemical compounds And Drawing Lewis Electron Dot Structure Prepared by: Abegail B. Palcongan Learning Targets At the end of the lesson you are able to: identify what type of chemical bond is formed between atoms; name the given chemical formula; and draw the LEDS of atoms and compounds. REVIEW Chemical bonds -attraction formed between atoms and ions to form molecules, compounds -results from electrostatic force formed between oppositely charged ions, or sharing of electrons -valence electrons are either transferred or shared Types of chemical bonds 1. Ionic bonding-transfer of electrons, metal and non metal, (polyatomic cations and anions), formula units 2. Covalent bond-sharing of electrons, form molecules *polar-unequal sharing (EN difference= >0.4) *non-polar-equal sharing (EN Difference= ≤0.4) Naming of binary inorganic covalent compounds 1. The element farthest to the left in the periodic table is usually named first. If both elements are in the same group, the element closer to the bottom of the column is named first. 2. The second element is named as if it were a monatomic anion in an ionic compound (even though it is not), with the suffix -ide attached to the root of the element name. 3. Identify the number of each type of atom (element) present. 4. Prefixes derived from Greek stems are used to indicate the number of each type of atom in the formula unit. **Do not write mono- if it applies to the first element in the formula, but write mono- if it applies to the second element. Naming of binary inorganic covalent compounds **Certain compounds are always called by the common names that were assigned long ago when names rather than formulas were used. For example, H2O is water (instead of dihydrogen oxide); NH3 is ammonia; PH3 is phosphine; SiH4 is silane; and B2H6, a dimer of BH3, is diborane. For many compounds, the systematic name and the common name are both used frequently, so you must be familiar with them. Naming of binary inorganic covalent compounds Image source: Examples of binary inorganic covalent compounds Name the following compounds: NH3, H2, CH4, HF, PF5, SF6 CO, CO2, NO, N2O , NO2 Naming of Ionic Compounds **Name the cation before the anion. Subscripts are not denoted in ionic compounds. Example: CaO, Fe2O3, NaCl, CaCl2, (NH4)2S, AlPO4, Fe3(PO4)2 LEDS of Covalent and Binary Ionic Compounds For covalent compounds: Example: NH3, H2, CH4, PF5, SF6 For ionic compounds: Example: CaO, Fe2O3, NaCl, CaCl2 FORMATIVE ASSESSMENT 3: Identify what type of chemical bond is formed and Draw the LEDS of the ff. Compounds: 1. MgO 2. CH3Cl 3. SO2 4. KI 5. H2O Check if we attained the target At the end of the lesson you are able to: Draw the LEDS of atoms and compounds; Identify what type of chemical bond is formed between atoms.