CHEMISTRY December 17, 2014 CHEMICAL BONDS. SCIENCE STARTER PICK UP FROM BACK TABLE 3 MINUTES YOU ARE SILENT AND SEATED.

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Presentation transcript:

CHEMISTRY December 17, 2014 CHEMICAL BONDS

SCIENCE STARTER PICK UP FROM BACK TABLE 3 MINUTES YOU ARE SILENT AND SEATED

IMPORTANT DATES TODAY – Final day for any outstanding homework THURSDAY – Lab FRIDAY – Quiz

AIM What type of bond exists between NaCl?

VOCABULARIES COVALENT BOND IONIC BOND DIATOMIC ATOMS METALLIC BOND

COVALENT BOND bond in which one or more pairs of electrons are shared by two atoms

IONIC BOND bond in which one or more pairs of electrons are removed and attached to another atom, resulting in cations and anions which attract each other.

BONDING RULES COVALENT BOND – BONDING BETWEEN TWO NONMETALS IONIC BOND – BONDING BETWEEN A METAL AND A NONMETAL

DIATOMIC ATOMS atoms comprising of 2 atoms comprising of the same element.

7 DIATOMIC ATOMS HAVE NO FEAR OF ICY COLD BEAR HYDROGEN NITROGEN FLUORINE OXYGEN IODINE CHLORINE BROMINE

METALLIC BOND bond in which the metals atoms move freely in all directions, given rise to “positive ions in a sea of electrons”

IONIC BONDS CompoundLewis Dot Structure KBr CaCl 2 LiF MgI 2

COVALENT BONDS Compounds Lewis Dot Structure NH 3 N2H4N2H4 N2H2N2H2 F2F2

QUESTION 1 What is the difference between an ionic bond and a covalent bond?

ANSWER 1 The main difference between a covalent bond and an ionic bond is that in an ionic bond, one or more electrons are removed and attached to another atom while in a covalent bond, one or more pairs of electrons are shared by two atoms

QUESTION 2 What charge will a Group 2 cation have?

ANSWER 2 +2

QUESTION 3 What charge will a Group 16 anion have?

ANSWER 3 -2

QUESTION 4 What charge will a Group 15 anion have?

ANSWER 4 -3

QUESTION 5 What is the total number of valence electrons for KBr?

ANSWER 5 8

QUESTION 6 What is the total number of valence electrons for F 2

ANSWER 6 14

QUESTION 7 Predict whether ionic or covalent if the following elements bond with oxide. Sodium Magnesium Aluminum Silicon Phosphorus Sulfur

ANSWER 7 Sodium Magnesium Aluminum Silicon Phosphorus Sulfur

AIM PROMPT WRITE YOUR RESPONSE TO THE AIM PROMPT What type of bond exists between NaCl? State your claim and provide evidence