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Question How many valance electrons do each of the following elements have: – Magnesium – Fluorine – Oxygen

Answer 1 –

Question Define covalent bonding

Answer 1 – 20 A bond in which 2 or more atoms are held together through the sharing of electrons

Question What is the difference between a polar and non-polar covalent bond? When must you draw a dipole?

Answer 1 – 30 A polar bond is when a dipole must be drawn. It represents the unequal sharing of electrons between 2 atoms ( electronegativity difference) A non-polar bond is when the electron between 2 atoms are being shared equally

Question Name the 7 diatomic molecules and draw their Lewis dot structures

Answer 1 – 40 Bromine, Iodine, Nitrogen, Chlorine, Hydrogen, Oxygen, Fluorine

Question Draw the Lewis Dot structure for the following 2 molecular compounds (draw dipoles where they are necessary) – C 2 HF – CH 2 O

Answer 1 – 50 DRAWING

Question In an ionic bond the electrons are ____________ between 2 atoms

Answer 2 – 10 Transferred

Question Give an example of 2 atoms that would combine to form an ionic compound. Give an example of 2 atoms that would combine to form a covalent compound

Answer 2 – 20 Answers will vary (many options!)

Question Draw the electron transfer for the following ionic bond Aluminum and Sulfur

Answer 2 – 30 DRAWING! Al 2 S 3

Question Identify the shape and bond angle for the following covalent compounds – H 2 O – NH 3

Answer 2 – 40 Bent, 105 Trigonal Pyramidal, 107

Question What is the bond angle for a tetrahedral molecule? Linear molecule? Trigonal planar? Give an example of 2

Answer 2 – , 180, 120 Answers will vary

Question Which of the following compounds contains a polar bond – CO 2 – CH 4 – Cl 2 – HCN

Answer 3 – 10 CO 2 and HCN

Question Draw the Lewis Dot Structure for N 2 H 2 with dipoles if necessary

Answer 3 – 20 DRAWING

Question Draw the electron transfer for the following ionic compound – Potassium and Nitrogen

Answer 3 – 30 DRAWING

Question A ____________ is defined by having 3 shared pairs of electrons between two atoms A ______________ is defined by have 2 shared pairs of electrons between two atoms

Answer 3 – 40 Triple covalent bond Double covalent bond

Question How many unshared pairs of electrons are on each oxygen atom in an oxygen-oxygen covalent bond?

Answer 3 – 50 2 on each oxygen

Question Ionic or covalent? CaF 2

Answer 4 – 10 Ionic

Question Ionic or covalent? CH 5 N

Answer 4 – 20 Covalent

Question Ionic compounds are formed between a ___________ and a _____________ Covalent compounds are formed between two or more ________________

Answer 4 – 30 Metal and Nonmetal Nonmetals

Question What is a metallic bond?

Answer 4 – 40 The positive metal cations are surrounded by a sea of mobile electrons (free-flowing) that allow metals to be good conductors of electricity

Question What is an alloy? What is the most important alloy today?

Answer 4 – 50 A mixture of two or more elements, one must be a metal Steels are the most important alloy today

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