CHEMISTRYDecember 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 ATOMSHAVE 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 BONDSCompound Lewis Dot StructureKBr

CaCl2

LiF

MgI2

COVALENT BONDSCompounds Lewis Dot Structure

NH3

N2H4

N2H2

F2

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 F2

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