Covalent Bonds - Anderson School District Five

Covalent Bonds - Anderson School District Five

Ionic Bonding pg. 82 Valence e- transfer to form crystal lattices Metals (+) transfer e- to Nonmetals (-) Cations (+) transfer e- to Anions (-) emeans electrons Binary Ionic Compounds

pg. 82 Made from two elements Cation keeps its name Ex: Magnesium (+2) Anion adds suffix ide Ex: Fluoride (-1) becomes Magnesium Fluoride MgF Polyatomic Ions

pg. 82 Covalently bonded group of atoms acting as one unit that can bond with other ions. Positive or Negative Ex: Ammonium NH4+ Hydroxide OHNitrate NO3Sulfate SO42- What is the correct formula

for a compound containing sodium and sulfur? a. NaS c. NaS2 b. Na2S d. NaS3 What is the correct formula

for a compound containing sodium and sulfur? a. NaS c. NaS2 b. Na2S d. NaS3 Answer: b

Oxidation numbers are used to a. keep track of the neutrons lost or gained by each atom. b. keep track of the protons lost or gained by each atom. c. keep track of the electrons lost or gained by each atom. d. keep track of the quarks lost or gained by each atom.

Oxidation numbers are used to a. b. c. d. keep track of the neutrons lost or gained by each atom. keep track of the protons lost or gained by each atom. keep track of the electrons lost or gained by

each atom. keep track of the quarks lost or gained by each atom. Answer: c The formation of an ionic bond involves the a. transfer of electrons. b. transfer of protons.

c. transfer of neutrons. d. none of the above. The formation of an ionic bond involves the a. transfer of electrons.

b. transfer of protons. c. transfer of neutrons. d. none of the above. Answer: a Valence e- from metal to nonmetal Fluorine, F, forms a binary ionic compound with lithium, Li. What is the name of this compound?

a. fluorine lithide b. lithium fluorine c. lithium fluoride d. fluorine lithium Fluorine, F, forms a binary ionic compound with lithium, Li. What is the name of this compound? a. fluorine lithide b. lithium fluorine c. lithium fluoride

d. fluorine lithium Answer: c Metal/Cation first, add ide to nonmetal/anion Covalent Bonds Two or more elements (nonmetals) share valence electrons to have a more stable outer electron structure.

page 85 What is a Molecule? Pg. 85 Only compounds formed from covalent bonds are called molecules. Metals bonded to nonmetals form ionic crystals not molecules! Circle the molecules and put an X on the compounds that are not molecules. NaCl NaOH

CO2 H 2O CH4 Al2O3 CaCl2 Br2 C6H12O6 N2 KI C4H10 3 Types of Bonding

pg. 85 Ionic Bonds Metal ions bond to nonmetal ions Covalent Bonds Nonmetal atoms bond with each other Metallic Bonds Metals bond with each other Properties of Covalent Compounds

Share electrons between nonmetal atoms (elements on right side of the periodic table) Low melting and boiling points Brittle Do not conduct electricity well

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