Ionic and Covalent Bonding

Objective – Today I will be able to: Correctly name and write the formula for ionic and covalent compounds Describe the properties of ionic, and covalent solids Evaluation/ Assessment – Informal assessment – Listening to group interactions as they complete the monoatomic and polyatomic ion sort and the naming formulas worksheets. – Formal Assessment – Analyzing student responses to the exit ticket and naming formulas worksheet Common Core Connection – Build Strong Content Knowledge – Look for and express regularity in repeated reasoning

Lesson Sequence Warm – Up Evaluate: Review Periodic Table Worksheet questions – Formal assessment Explore: Cations vs. Anions – Informal assessment Explore: Monoatomic and Polyatomic Ions Sort – Informal assessment Explain: Writing Ionic Bond Formulas Elaborate: Writing Ionic Formulas Practice – Formal assessment Explain: Naming Ionic Compounds Elaborate: Naming Ionic Compounds Practice – Formal assessment Explain: Ionic Compound Properties and Naming Covalent Compounds Evaluate: Exit ticket – Formal assessment

Warm - Up Which element has the larger radius? Explain. – Be or O Which element has the smaller electronegativity? Explain. – Sr or Ra Which element has the greater ionization energy? Explain. – S or Cl

Objective Today I will be able to: – Correctly name and write the formula for ionic and covalent compounds – Describe the properties of ionic, and covalent solids

Homework Study for Periodic Table (mini-exam) on Thursday and Friday Wear closed toe shoes Thursday/Friday STEM Fair – Final Research Paper due Monday December 17 – In Class Presentations Wednesday January 23

Agenda Review Periodic Table Questions Worksheet Cation vs. Anion (pink sheet) Monoatomic vs. Polyatomic Ions Ionic Bonds – Writing formulas – Naming formulas – Properties Covalent Compounds – Naming formulas – Properties Exit Ticket

Review Periodic Table Worksheet Answers Review responses as a class, students will keep responses to review for the exam.

Review: Cation vs. Anion Pink Sheet

Monoatomic Ion vs. Polyatomic Ion Class Discussion and Ion Sort

Bonding

Why do elements form bonds? Every element wants a full outer energy level to satisfy the octet rule They achieve this by gaining, losing and sharing electrons

Ionic Bonds

Formed by the transfer of electrons from one atom to another Generally between a metal and a nonmetal Held together by electrostatic forces – (opposite charges attracting)

Writing formulas – Two Methods Snap it Together Method Na 1+ Cl 1- NaCl Criss-Cross Method

Writing Ionic Formula Practice Complete the worksheet. Please ask Ms. Ose for help with questions.

Naming Ionic Compounds Standard Naming Rules – Write the full name of the metal first – Then write the second element, take off the ending and add the suffix –ide – If the second ion is a polyatomic ion, use the full name of the ion Examples – CaO – Calcium Oxide – BaCl 2 – Barium Chloride

Naming Ionic Compounds Exceptions – Transition metals can have multiple oxidation numbers – Standard naming rules apply but we need to account for the oxidation number use a roman numeral – Examples FeCl 3 – Iron(III) Chloride FeCl 2 – Iron (II) Chloride PbCl 4 – Lead(IV) Chloride

Naming Ionic Compounds Practice Complete the worksheet. Please ask Ms. Ose for help with questions.

Properties of Ionic Compounds Crystalline Solid at room temperature High melting and boiling points Soluble in water (when they dissolve in water they conduct electricity)

Properties of Ionic Compounds Cont. Ionic compounds are hard, rigid and brittle – Crystalline Structure – crystal retains it shape until enough energy is applied to shift the positions and crack the crystal

Ionic Compounds Properties Cont. Molten state can also conduct electricity Solid ionic compound Molten ionic compound Ionic compound dissolved in water

Exit Ticket What’s wrong with the following formula/ name of compound? Mg 2 Cl MgSO 4 – Magnesium sulfide Baride Chlorine