UNIT FOUR BONDING AND NOMENCLATURE CHEMISTRY UNIT 4: BONDING AND NOMENCLATURE Overview During this unit, students will be asked to answer questions about the properties of compounds based on their knowledge of electron structure. The teacher should review valence electrons, electron dot symbols for the elements, and electron configurations of cations and anions. Because elements are the building blocks of all matter, students should understand the importance of bonding. Emphasize that very few of the elements are found free and uncombined in nature. Since there are over ten million compounds identified, there has to be a universal system for naming compounds and writing formulas. As molecular models are developed and intermolecular forces are identified, students will better understand the properties of solids, liquids, and gases covered later. Students typically find it difficult to distinguish between polar bonds and polar molecules. It may be helpful to tell students that all covalent bonds between atoms of different elements will have some polarity in the bond, but the geometric arrangement of the atoms of the molecule may minimize this polarity for the overall molecule. When teaching the rules and providing practice for nomenclature, keep in mind that there are only a small number of polyatomic ions required by the VA SOL. It is up to the teacher’s discretion to assign more ions to be memorized or to give students a list of polyatomic ions on a reference chart. The skill of writing a formula from the ions is what needs to be reinforced. Since the polyatomic ions are being introduced in this unit, it is a good time to teach acid nomenclature. Students may then use acids when writing equations in the upcoming unit. Suggested Time Allotment 12 blocks (4½ weeks) Conceptual Framework Bonding Difference in Electronegativity Ionic Bond Covalent Bond Octet Rule Type Single, Double, Triple, Nonpolar, Polar Molecular Compounds Two Nonmetals, Low Melting Pt., Low Conductivity, Nonelectrolytes Cation Anion e- Config of ions Properties Nomenclature Ionic Compounds Common Compounds Properties High Melting Point Conductivity Water, Ammonia, Methane Prefixes CO, CO2, SO2, CF4 Crystalline Solids Acids Nomenclature Binary, Ternary Oxidation State Lewis Diagram Binary Resonance Metal & Nonmetal Exceptions to Octet Rule Ternary Structural Formula Metal & Polyatomic Ion Hydroxide, Nitrate, Carbonate, Sulfate, Phosphate, Ammonium Polyatomic Ion & Nonmetal Geometry Intermolecular Forces Dispersion, Dipole-dipole, Hydrogen Bonding Linear, Bent, Trigonal Planar, Pyramidal, Tetrahedral Related VA Standards of Learning SOL CH.2 The student will investigate and understand that the placement of elements on the periodic table is a function of their atomic structure. The periodic table is a tool used for the investigations of d. families or groups. SOL CH.3 The student will investigate and understand how conservation of energy and matter is expressed in chemical formulas and balanced equations. Key concepts include a. nomenclature; c. writing chemical formulas (molecular, structural, empirical, and Lewis diagrams); and d. bonding types (ionic, covalent). Instructional Objectives 4.1 Bonding 4.1.1 Use electronegativity values to predict bond type as ionic, polar covalent, or nonpolar covalent. 4.1.2 Differentiate between elements, ionic compounds, and molecular compounds 4.1.3 Review how the charge of a cation and/or anion for representative elements is based on position in the periodic table. 4.1.4 Describe the characteristics of ionic compounds to include boiling points and melting points. 4.1.5 Draw the electron dot symbols (Lewis diagrams) for elements, simple compounds, and polyatomic ions. Include resonance structures and exceptions to the octet rule. 4.1.6 Construct models of various molecules to include: linear, bent, trigonal planar, pyramidal, and tetrahedral shapes. 4.1.7 Identify the forces of attraction between molecules to include dispersion forces, dipole interactions, and hydrogen bonds. 4.2 Nomenclature 4.2.1 Memorize the names and symbols for common elements including the diatomic elements. 4.2.2 Memorize the names and formulas for common monatomic and polyatomic ions to include: carbonate, sulfate, nitrate, hydroxide, phosphate, and ammonium. 4.2.3 Write the formula for an ionic compound when given the name. 4.2.4 Write the name of an ionic compound when given the formula. 4.2.5 Write the name for a molecular compound when given the formula. 4.2.6 Write the fomula for a molecular compound when given the name. 4.2.7 Write the chemical formulas for common substances such as: ammonia, water, carbon monoxide, carbon dioxide, sulfur dioxide, and carbon tetrafluoride. 4.2.8 Write names and formulas of common binary and ternary acids. Enduring Understanding Compounds are created by chemical bonds. Essential Question What is the relationship between bonding and compounds? Guiding Questions How can electron configurations be used to explain chemical reactivity of the elements? How does the concept of electronegativity describe the nature of the chemical bond? How does bond type affect properties of compounds? How are compounds named? How can we relate molecular structure to molecular behavior? How do molecules interact? What Students Should Know Atoms can gain, lose, or share electrons within the outer energy level. Chemical formulas are used to represent compounds. Subscripts represent the relative number of each type of atom in a molecule or formula unit. Bonds form between atoms to achieve stability. Forces of attraction between molecules determine the physical changes of state. Loss of electrons from neutral atoms results in the formation of an ion with a positive charge (cation). Gain of electrons from neutral atoms results in the formation of an ion with a negative charge (anion). Transition metals can have multiple oxidation states. When pairs of elements form two or more compounds, the masses of one element that combine with a fixed mass of the other element form simple, whole-number ratios (Law of Multiple Proportions). Ionic bonds involve the transfer of electrons. Ionization energy is the energy required to remove the most loosely held electron(s) from a neutral atom. Elements with low ionization energy form positive ions (cations) easily. Elements with high ionization energy form negative ions (anions) easily. Ionic compounds are typically crystalline solids with high melting points and good conductors of electricity when molten or dissolved in water. The molecular formula of a compound shows the actual number of atoms for each element in one molecule of the substance. Structural formulas show the arrangement of atoms and bonds. Covalent bonds involve the sharing of electrons. Electronegativity is the measure of the attraction of an atom for electrons in a bond. Polar molecules result when a molecule behaves as if one end were positive and the other end negative. The IUPAC system is used for naming compounds. Forces of attraction between molecules include hydrogen bonding, dipole-dipole attractions, and London dispersion (van der Waals) forces. What Students Should Be Able To Do Name binary ionic compounds (using the IUPAC system). Recognize the formulas and names of certain polyatomic ions such as carbonate, sulfate, nitrate, hydroxide, phosphate, and ammonium and use these polyatomic ions for naming and writing the formulas of ionic compounds. Name binary molecular compounds. Predict, draw, and name molecular shapes (bent, linear, trigonal planar, tetrahedral, and trigonal pyramid) using VSEPR theory. Write the chemical formulas for ionic and molecular compounds including the formulas for common substances such as ammonia, water, carbon monoxide, carbon dioxide, sulfur dioxide, and carbon tetrafluoride). Draw Lewis structures to show covalent bonding. Predict the bond type in a compound by using electronegativity values. Recognize polar and nonpolar molecules and predict intermolecular attractions. Instructional Resources Text: Modern Chemistry, pp. 174-217, pp. 218-259. Chemistry Unit 4 Activities: Bonding and Types of Bonds, Lewis Structures, Molecular Geometry and Molecule Polarity, Building an Ionic Compounds, Naming Compounds Flowchart, Naming Ionic Compounds, Naming Ionic and Molecular Compounds, Naming Acids, Bonding and Bond Character, Chem Activity-Classification of Matter, and Chem ActivityPolyatomic Ions. Unit 4 Chemical Bonding and Naming – Lessons A-B Day 31 Tues-Wed Dec 7-8 SOL 2 SOL 3 Chapter 6, Sec 1 -2 Covalent Bonding 1.Define and describe COVALENT & IONIC BONDING & 2.Relate chemical bonding to chemical stability and P.E. 3.Classify chemical bonds according to electronegativity differences 4.Define Molecule & Octet Rule 5.Descrive multiple covalent bonds & resonance structures 6.Describe Lewis Structures 7. Demonstrate Lewis Structures CHECKLIST of STRATEGIES: Technology: Reading: Writing: Cooperative Learning: Differentiation: Manipulatives: Multiple Intelligences: Vocabulary : Questioning: A-B Day 31 Thur-Fri Dec 9-10 SOL 2 SOL 3 Chapter 6, Sec 2 -3 Covalent & Ionic Bonding 1.Define: Ionic Compound, formula unit, lattice energy, Polyatomic ions 2.Compare ionic compounds with covalent molecules 3.Relate lattice energy ionic crystals CHECKLIST of STRATEGIES: Technology: Reading: Writing: Cooperative Learning: Differentiation: Manipulatives: Multiple Intelligences: Vocabulary : Questioning: Procedures: HOOK: 1.Discuss Objectives 2. Discuss Key Terms p.208 3.Discuss SR p. 177 4. Practice Drawing Lewis Structures CLOSURE: Materials: Mobi-CPS Textbook Online Textbook Link: http://my.hrw.com HW: 1.Complete SR Questions p. 177 2.Read/Study Chp6, Sec 2 & 3 3.Complete Practice Problems 1,2,&3, p. 186 & PP p. 188 4.Complete SR Questions p. 189 Compass to 2015 Strategies: Critical Thinking: Creative/Innovative Thinking: Problem Solving : Information Literacy : Listening : Collaboration Communication : Social Responsibility : Sustainablility: Interdependence : Health Literacy: Procedures: HOOK: 1.Critique/ Q-A HW (Sec 2) 2.Discuss Section 3, Ionic bonding and compounds 3.Discuss SR p. 194 CLOSURE: Lesson Critique: Compass to 2015 Strategies: Critical Thinking: Creative/Innovative Thinking: Problem Solving : Information Literacy : Listening : Collaboration Communication : Social Responsibility : Sustainablility: Interdependence : Health Literacy: Lesson Critique: Materials: Mobi-CPS Textbook Link: http://my.hrw.com HW: 1.Read/Study Chap 6, Sec 3 2.Complete SR p. 194 3.Read/Study Sec 4 (Metallic Bonding) A-B Day 32 Mon-Tues Dec 13 & 14 Chapter 6, Sec 3 & 4 SOL 2 SOL 3 1.Define Key Terms (p.208): metallic bonding, malleability, ductility 2.Describe metallic bonding 3.Explain why metallic surfaces are shiny 4.Explain why metals are malleable and ductile and ionic compounds are not (“sea” of electrons) CHECKLIST of STRATEGIES: Technology: Reading: Writing: Cooperative Learning: Differentiation: Manipulatives: Multiple Intelligences: Vocabulary : Questioning: A-B Day 33 Wed-Thur Dec 15-16 SOL 2 SOL 3 CHAPTER 6 Section 5 p.197-207 Complete LAB Molecular Geometry Objectives: 1 Determine molecular shape 2.Determine bond polarity 3. Determine Molecular polarity 4.Identify 25 Polyatomic Ions CHECKLIST of STRATEGIES: Technology: Reading: Writing: Cooperative Learning: Differentiation: Manipulatives: Multiple Intelligences: Vocabulary : Questioning: Procedures: HOOK: 1.Critique HW (Section 3) 2.Discuss metallic bonding and how it relates to metallic properties 3.Discuss SR p. 196 CLOSURE: Materials: Mobi-CPS Textbook Link: http://my.hrw.com HW: 1.Read Study Chap 6, Sec 4 & 5 2.Complete SR, p. 196 3.Read / Study Sec 5, Molecular Geometry (Polarity) Compass to 2015 Strategies: Critical Thinking: Creative/Innovative Thinking: Problem Solving : Information Literacy : Listening : Collaboration Communication : Social Responsibility : Sustainablility: Interdependence : Health Literacy: Procedures: HOOK: LAB: Molecular Geometry 1.Copy Polyatomic Ion List 2.Complete Polyatomic Ion QUIZ 3.Complete Molecular Geometry LAB Lesson Critique: 4.Q/A Chapter 6 (All sections, all section review questions, all practice problems) CLOSURE: Compass to 2015 Strategies: Critical Thinking: Creative/Innovative Thinking: Problem Solving : Information Literacy : Listening : Collaboration Communication : Social Responsibility : Sustainablility: Interdependence : Health Literacy: Materials: MOBI-CPS 1.Polyatomic Ion List 2.Molecular Geometry LAB Link: http://my.hrw.com HW: 1.Read/Study Chapter 6 2.Complete all Section Review and Practice Problems (Chp 6) 3.Prepare for Chapter 6 QUIZ Lesson Critique: A-B Day 34 Fri & Mon Dec 17&20 SOL 2 SOL 3 CHAPTER 6 Section 5 p.197-207 Complete LAB Molecular Geometry Objectives: 1 Determine molecular shape 2.Determine bond polarity 3. Determine Molecular polarity 4.Identify 25 Polyatomic Ions 5. Define Key Terms p. 208,VSEPR. Orbital hybridization, dipole, hydrogen bonding London Dispersion Forces CHECKLIST of STRATEGIES: Technology: Reading: Writing: Cooperative Learning: Differentiation: Manipulatives: Multiple Intelligences: Vocabulary : Questioning: A-B Day 35 Tues-Wed Dec 21-22 SOL 2 SOL 3 Complete Chapter 6 TEST – All Sections A-B Day 36 Mon-Tues Jan 3-4 SOL 2 SOL 3 1.Critique/Correct Chp 6 TEST BEGIN: CHAPTER 7 NAMES & FORMULAS - MAIN BLOCK IONS 1.Define / Explain CHEMICAL FORMULA 2.Given 2 Ions, determine the IONIC FORMULA (Monatomic Ions) 3. Given Ionic Formula, determine IONIC NAME (Monatomic Ions) Procedures: HOOK: 1.Resume Molecular Geometry LAB – complete 2.Draw Lewis Structures for Polyatomic Ions 3.Discuss Chap 6, Sec 5 4. Discuss PP p. 201 5.Discuss SR p. 207 CLOSURE: Materials: MOBI-CPS 1.Textbook 2.Molecular Geometry LAB 3.Molecular Model Kits Link: http://my.hrw.com HW: 1.Complete Molecular Geometry LAB 2.Read/Study Chap6 (All) 3.Complete all Chap 6 PP and SR 4.Prepare for Chapter 6 QUIZ (All Section) next period. Compass to 2015 Strategies: Critical Thinking: Creative/Innovative Thinking: Problem Solving : Information Literacy : Listening : Collaboration Communication : Social Responsibility : Sustainablility: Interdependence : Health Literacy: Procedures: HOOK: 1.Complete Chpater 6 TEST 2.Complete Molecular Geometry LAB CLOSURE: Lesson Critique: Procedures: HOOK: 1.Return Chp 6 QUIZ 2. Correct/Critique/Q&A QUIZ 3. Discuss Chp 7.1 (1st half) 4. Complete Practice Problems 1&2, p. 223 5. Complete Practice Problems 1&2, p. 225 CLOSURE: Materials: MOBI-CPS 1.Chapter 6 QUIZ 2.Textbook – Chapter 7 Link: http://my.hrw.com HW: 1.Prepare for POLYATOMIC ION QUIZ #1 2.Read/Study Chp 7, Sections 1&2 3. Complete Practice Problems p. 227 & 229 4. Section Review Questions p. 231 Materials: CPS 1.Chapter 6 TEST 2. Molecular Model Kits 3. Molecular Geometry LAB Write -up CHECKLIST of STRATEGIES: Technology: Reading: Writing: Cooperative Learning: Differentiation: Manipulatives: Multiple Intelligences: Vocabulary : Questioning: A-B Day 37 Wed-Thurs Jan 5&6 SOL 2 SOL 3 Chapter 7.1 1.Complete Polyatomic Quiz # 4 2.Determine names and formulas of ionic compounds with TRANSITION METALS 3.Determine names and formulas of ionic compounds with POLYATOMIC IONS p. 225-226 4. Determine names and formulas of MOLECULAR COMPOUNDS 5.Determine names and formulas of ACIDS CHECKLIST of STRATEGIES: Technology: Reading: Writing: Cooperative Learning: Differentiation: Manipulatives: Multiple Intelligences: Vocabulary : Questioning: A-B Fri & Mon Day 38 Jan 7 & 10 SOL 2 SOL 3 Chapter 7.2 1.Identify/recognize polyatomic ions 2.Write chemical formulas / names (7.1) 3.Identify Oxidation numbers for ionic and covalent compounds (7.2) 4.Define: Formula mass Molar Mass (7.3) Compass to 2015 Strategies: Critical Thinking: Creative/Innovative Thinking: Problem Solving : Information Literacy : Listening : Collaboration Communication : Social Responsibility : Sustainablility: Interdependence : Health Literacy: Procedures: HOOK: 1.Discuss Chp 7.1 (2nd half) 2.Complete Practice Problems and Section Review Questions CLOSURE: CPS Activity re; 7.1 & 2 Lesson Critique: Materials: MOBI-CPS Textbook Polyatomic Ion List HO: Naming and Formulas Link: http://my.hrw.com HW: 1.Study for POLYATOMIC QUIZ #5 2.Read/Study Chp 7.2 3.Complete Practice Problems 4.Complete Section Review Questions 5.Complete “Naming and Formulas” Compass to 2015 Strategies: Critical Thinking: Creative/Innovative Thinking: Problem Solving : Information Literacy : Listening : Collaboration Communication : Social Responsibility : Sustainablility: Interdependence : Health Literacy: Procedures: HOOK: Oxidation Number video at: Link: http://my.hrw.com 1.Complete Polyatomic Ion Quiz #5 2. Critique CPS Activity 7.1 &7.2 3.Q & A HO “Naming & Formulas” 4. Explain / Practice determining oxidation numbers Lesson Critique: Need more time in 3A and 1B Materials: MOBI-CPS Textbook Polyatomic Ion list HO: “Naming & Formulas” Link: http://my.hrw.com HW: 1.Complete section review questions 2.Complete Practice Problems (7.1,7.2,7.3) 3.Complete HO: “Naming & Formulas” 4.Read/Study Sec 7.3 and 7.4 CHECKLIST of STRATEGIES: Technology: Reading: Writing: Cooperative Learning: Differentiation: Manipulatives: Multiple Intelligences: Vocabulary : Questioning: A-B Day 39 Tues-Wed Jan 11-12 SOL 2 SOL 3 Chp7.3 FORMULA & MOLAR MASS 1.Calculate the formula mass or molar mass given chemical formula 2.Convert molar MASS to MOLES of chemical compounds given chemical formula and sample mass 3.Convert MOLES to PARTICLES (atoms, ioms) 4.Convert MASS to PARTICLES Compass to 2015 Strategies: Critical Thinking: Creative/Innovative Thinking: Problem Solving : Information Literacy : Listening : Collaboration Communication : Social Responsibility : Sustainablility: Interdependence : Health Literacy: Procedures: HOOK: 1 Discuss- Q/A Chp 7.3 3. Complete all 7.3 Practice Problems pp. 238, 239, 240, 241, 242, 243, 244 4. Complete all 7.3 Section Review Questions p. 244 CLOSURE: Calculate FORMULA MASS AND MOLAR MASS OF Lesson Critique: Materials: MOBI-CPS Textbook Link: http://my.hrw.com HW: 1.Complete all Practice Problems in 7.3 2.Read/Study Chp 7.4 Empirical Formulas 3. Begin PP and Section Review Questions in 7.4 Iron II Phosphate CHECKLIST of STRATEGIES: Technology: Reading: Writing: Cooperative Learning: Differentiation: Manipulatives: Multiple Intelligences: Vocabulary : Questioning: A-B Day 40 Thurs-Fri Jan 13-14 SOL 2 SOL 3 Chapter 7.4 EMPIRICAL FORMULAS 1.Define EMPIRICAL FORMULA (Relate difference between ionic and molecular formulas) 2.Determine EMP FORMULA from both % COMP and MASS Composition 3. Explain relationship between EMP FORMULA & MOLECULAR FORMULA 4.Determine MOLECULAR FORMULA from EMPIRICAL FORMULA Compass to 2015 Strategies: Critical Thinking: Creative/Innovative Thinking: Problem Solving : Information Literacy : Listening : Collaboration Communication : Social Responsibility : Sustainablility: Interdependence : Health Literacy: Procedures: HOOK: Link: http://my.hrw.com 1.Discuss 7.4 2. Complete all Practice Problems pp.246, 247, 248, 249 3.Complete Section Review Questions p. 249 4. Preview CHAPTER 7 TEST CLOSURE: Lesson Critique: Materials: MOBI-CPS 1.POLYATOMIC ION QUIZ 2.Textbook Link: http://my.hrw.com HW: 1.Complete all PP pp. 246, 247, 248, 249 2.Comlete Section Review Questions p. 249 3.Prepare for Chapter 7 TEST CHECKLIST of STRATEGIES: Technology: Reading: Writing: Cooperative Learning: Differentiation: Manipulatives: Multiple Intelligences: Vocabulary : Questioning: 41 Tues-Wed Jan 18-19 A-B Day SOL 2 SOL 3 Review Chapter 7 – TEST PREP Compass to 2015 Strategies: Critical Thinking: Creative/Innovative Thinking: Problem Solving : Information Literacy : Listening : Collaboration Communication : Social Responsibility : Sustainablility: Interdependence : Health Literacy: Procedures: HOOK: Link: http://my.hrw.com 1.Covalent and Ionic bonding 2.Naming and Formula writing 3.Oxidation Numbers 4.Formula and Molar Mass 5.% Composition 6.Empirical and Molecular Formulas 1.Q & A all Chapter 7 Practice Problems and Section Review Questions 2 Preview CHAPTER 7 TEST CLOSURE: CPS Activity 7.3 & 7.4 Critique CPS Activity CHECKLIST of STRATEGIES: Technology: Reading: Writing: Cooperative Learning: Differentiation: Manipulatives: Multiple Intelligences: Vocabulary : Questioning: Compass to 2015 Strategies: Critical Thinking: Creative/Innovative Thinking: Problem Solving : Information Literacy : Listening : Collaboration Communication : Social Responsibility : Sustainablility: Interdependence : Health Literacy: Procedures: 42 Thurs-Fri Jan 20-21 A-B Day TEST Chapter 7 Naming & Formulas Complete Chapter 7 TEST Lesson Critique: Materials: MOBI-CPS Link: http://my.hrw.com HW: 1.Complete all PP pp. 246, 247, 248, 249 2.Comlete Section Review Questions p. 249 3.Prepare for Chapter 7 TEST Lesson Critique: Materials: Chapter 7 TEST Textbook MOBI-CPS HW Study “Old Tests” in preparation for Semester I Exam “Look” for missed questions CHECKLIST of STRATEGIES: Technology: Reading: Writing: Cooperative Learning: Differentiation: Manipulatives: Multiple Intelligences: Vocabulary : Questioning: 42 Mon – Tues Jan 24-25 A-B Day Critique Chapter 7 TEST Semester Exam Review CHECKLIST of STRATEGIES: Technology: Reading: Writing: Cooperative Learning: Differentiation: Manipulatives: Multiple Intelligences: Vocabulary : Questioning: Compass to 2015 Strategies: Critical Thinking: Creative/Innovative Thinking: Problem Solving : Information Literacy : Listening : Collaboration Communication : Social Responsibility : Sustainablility: Interdependence : Health Literacy: Procedures: Return corrected Chapter 7 TEST Critique Chapter 7 TEST Lesson Critique: Materials Chapter 7 Test Chapter Tests for Chp 1, 2, 3, 4. 5. 6 MOBI-CPS Preview Semester I Exam HW: Study for Semester I Exam USE WEBSITE http://discoverva.com/Chemsite/chemi ndex09.html Compass to 2015 Strategies: Critical Thinking: Creative/Innovative Thinking: Problem Solving : Information Literacy : Listening : Collaboration Communication : Social Responsibility : Sustainablility: Interdependence : Health Literacy: Lesson Critique: