Download Regents Chemistry

Mr. Shields
Learning Objectives - Unit 9
Ionic and Metallic Bonding
Regents Chemistry
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Know the definition of a Chemical Bond
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Know what the most abundant metal and non-metal is in the earth’s crust
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Recognize that the driving force of chemical bond formation is the formation of the octet
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Know the definition of an ionic bond
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Know that the attraction of opposite charges is the force of attraction in an ionic bond
Be able to describe ionic bond formation in term of an electron transfer process
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Metals transferring electrons to non-metals
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Draw Lewis dot structures to show how electrons are transferred to form ionic compounds
Given 2 elements be able to determine the chemical formula of the ionic compound formed when they react
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Be able to use oxidation numbers to help explain the formula
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Be able to show how electrons are transferred between all the atoms
Be able to draw and explain key points on the PE Curve for bond formation
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Filled s and p orbitals in the valence shell
Know that PE is stored in a chemical Bond
Be able to explain why energy is absorbed when a bond is broken & energy is released when a bond is formed.
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Ionic reactions are exothermic
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Bond breaking is endothermic
Know that metals tend to form Cations (pos. ions) and non-metals tend to form Anions (neg. ions) and
together they form ionic compounds
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Know that binary ionic compounds contain 2 different elements (but not necessarily only 2 atoms)
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Know that ionic compounds form crystal lattice structures and be able to explain in general terms how these
are arranged in terms of alternating positive and negative charge
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Be able to Calculate which of several compounds is more ionic than the others based on electronegativity
differences
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Know that bonds having an electronegativity difference greater than 1.7 are considered to be ionic
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The higher the EN difference the greater the ionic character
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Less than 1.7 the compound is not considered ionic
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Be able to discuss the physical properties of IONIC compounds
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Be able to explain why Ionic compounds will not conduct electricity in the solid (crystalline) phase but will
conduct electricity if molten or in solution
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Be able to draw Lewis Dot structures for ions and Ionic compounds
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Define the term oxidation number
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Mr. Shields
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Learning Objectives - Unit 9
Ionic and Metallic Bonding
Regents Chemistry
Know the Typical oxidation numbers for Group 1,2, 13-18
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Know the Crisscross method for determining the subscripts in binary ionic compound formulas
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Know how to name ionic compounds using the stock system when given the chemical formula (ex. Cr(NO3)3
= Chromium (III) nitrate)
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Know how to write ionic compound formulas when given their stock system name for example
Chromium (III) nitrate = Cr(NO3)3
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Know that the names of binary ionic compounds end in –ide (ex. Calcium sulfide)
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Know polyatomic ions are groups of atoms covalently bonded that have a positive or negative charge that
enables them to form ionic compounds
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Recognize in a chemical formula the presence of a polyatomic ion
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Memorize the names, formula and charge of the Polyatomics in the list given you
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Be able to use TABLE E to determine names, formulas and charge whne needed
Know that the endings of polyatomic ions end in –ite, -ate, and –ide.
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Polyatomic ions ending in –ate have more oxygen than those ending in –ite (ex. SO4 = sulfate,
SO3 = sulfite)
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Know the definition of a metallic bond
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Be able to explain how metallic bonds are formed in terms of valence electrons and temporary cations
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Freely flowing valence electrons moving from one overlapping valence shell to the next
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Be able to explain verbally and visually what is meant by the term “sea of electrons”
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Be able to discuss the physical properties of METALS
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Know that metals conduct electricity and are good conductors of heat
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Be Explain these properties of metals in terms of delocalized electrons
Know that as the possible number of delocalize electrons increases strength and hardness of the metal also
increases
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Be able to explain why metals are malleable and ductile whereas ionic compounds are not
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Ionic compounds form crystals that will shatter if struck hard
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