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How could ions come together to form compounds?

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How could ions come together to form compounds?

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  1. 1/10/11 Last week’s winners: 4th periodCatalyst:1. What does an atom have to do to become a cation? 2. What does an atom have to do to become an anion?Objective:Describe the properties of ionic compounds and relate the properties to the chemical structure.Homework:Complete Cornell notes on chapter 5, section 2 by Wednesday

  2. How could ions come together to form compounds? • Rules: • Opposites attract • All compounds are neutral in charge • When combined form salts

  3. How are electrons transferred between atoms? • Ionization energy=energy to remove an electron • Electron affinity=energy to add an electron • Negative ions release energy when adding electrons, but less than required

  4. What are the steps of forming the bond? Endothermic (energy needed) steps: • Cations formed and non-metal atoms separated from one another Exothermic (energy releasing) steps: • Electrons added to non-metal atoms to form anions • Anions and cations form bonds producing lattice energy

  5. What are the properties of salts? • Solid at room temperature • High melting and boiling points • Dissolved and liquid salts conduct electricity • Hard and brittle

  6. Why do salts have these properties? • Strong bonds require a lot of energy to separate ions to melt or boil • Because atoms have charge, they conduct electrical current well when they can move freely • Strong bonds and alternating cations and anions make salts hard, but brittle

  7. Summaryquestions • What force holds together ions? • How does an ionic bond form? • Why do dissolved ions, but not solid ionic compounds, conduct electricity? • Why will two metals or two non-metals not form an ionic bond? • Which metals, alkali or alkaline earth metals, will more easily form an ionic bond?

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