Presentation on theme: "Ionic Bonds And Ionic Compounds"— Presentation transcript:
1 Ionic Bonds And Ionic Compounds Section 7.2Ionic BondsAndIonic Compounds
2 Formation of an Ionic Bond CompoundA chemical combination of two or more different elementsBinary compounds when there are exactly two different elements
3 Na + Cl Na+ + Cl- + energy P. 210 shows chemical reactions that form ionic bonds and release energySodium and chlorine gas produce a white crystalline solidNa + Cl Na+ + Cl- + energyThis is called a chemical equation.
4 What Happened? + Sodium transferred one valence electron to chlorine. [Na]+ + [Cl]- + energy+This is the electron-dot structures
5 Types of Ionic Compounds Electrostatic force holds the charged atoms together is the ionic bond.Metal and non-metal ionic bond are called oxides.Most other ionic compounds are called salts.
6 Names Sodium + Chlorine forms sodium chloride Sodium is a metal Chlorine is a non-metalChange chlorine to chloride in the name of the compound
7 p. 210 bRibbon of magnesium metal burns in air, it forms the ionic compound magnesium oxide.Magnesium is a metalOxygen is a non-metalNotice the name, oxygen became oxide.Is this a binary ionic compound?
8 Questions Explain how an ionic compound forms from these elements sodium and nitrogenlithium and oxygenstrontium and fluorinealuminum and sulfur
9 Properties of Ionic Compounds Physical structureRatio of positive and negative ionsIons are packed into repeating pattern* No single unit of Na and Cl exists, there are many Na+ and Cl- ions in a 1 to 1 ratio.
12 Crystal Lattice Three dimensional geometric arrangement of particles Each positive ion is surrounded by negative ions and each negative ion is surrounded by positive ionsThe number of ions and the ratio determine the size and shape
13 Examples Minerals More than 1/3 of all known minerals are silicates HalidesBoratesCarbonatesWhat elements do you think are in these?
14 Physical Properties Melting point - high Boiling point - high Hardness - hard, rigid, brittle solids, hard to break apartDepends on the strength of the ionic attractionConduct electricitySolids: ions are locked into place, cannot conduct electricityMelt or dissolve solids into solutions, the yesElectrolytes are solutions that conduct electricity and important to humans
15 Energy Endothermic Energy is absorbed Exothermic Energy is released Formation of ionic compoundsForms more stable system so lower energy state, release energy
16 Lattice EnergyEnergy required to separate 1 mol of the ions in an ionic compoundThe greater the lattice energy, the stronger the force of attraction ( harder to separate)
17 SummaryIonic compounds contain ionic bonds formed by the attraction of oppositely charged ions.Ions in a ionic compound are arranged in repeating patterns known as a crystal lattice.Ionic compounds properties are related to ionic bond strength.
18 Ionic compounds are electrolytes; they conduct an electric current in the liquid phase and in aqueous solution.Lattice energy is the energy needed to remove 1 mol of ions from its lattice.
19 QuestionsExplain how an ionic compound made up of charged particles can be neutral?Describe the energy change associated with ionic bond formation, and relate it to stabillity.Identify three physical properties of ionic compounds that are associated with ionic bonds, and related them to bond strength.
20 Explain how ions form bonds, and describe the structure of the resulting compound. Relate lattice energy to bond strength.Use electron configurations, orbital notations and electron dot structures to represent the formation of an ionic compound from the mental strontium and the non-metal chlorine.
21 QuestionUsing the elements aluminum and oxygen, determine the formula for the ionic compound.Extension: Use Fe2+ and Fe3+ to combine with O2-Determine the formula for the ionic compounds.
22 Each Student List a metal and a non-metal Exchange papers and determine the ionic compound formed between them.
23 Exit TicketDetermine the ionic compound formed from Mg and Cl and explain how it was formed.Include its ratio