Warm up: p20 1.What is the difference between an atom and an ion? Date Session # ActivityPage # 9/ Unknown Substance18 Physical or Chemical??19 10/1-2 12Bonding Notes20 Bonding Identification w/s20 h/w: Vocab set 2…descriptions Label bonds: Find two substances on a label at home. Look up the chemical formula Identify the bonds as ionic or covalent Periodic table essay due 10/6

8.P.1 Understand the physical properties of matter and changes that occur when matter interacts in an open or closed container 8.P.1.1Classify matter as an element, compound or mixture based on how atoms are packed together in arrangements. 8.P.1.3 Compare physical changes such as size, shape and change of state to chemical changes that are a result of a chemical reaction to include changes in temperature, color, gas or formation of a precipitate.

TLW recognize different types of chemical bonds by completing a note sheet, identifying bond properties from demonstrations and completing a bond identification worksheet.

CHEMICAL BONDING IONIC BONDS COVALENT BONDS METALLIC BONDS morton

What is a chemical bond? Attraction between valence electrons of different atoms…form new substances Bonding only involves valence electrons

IONIC BONDING Transfer of electrons Occurs between a Metal and a Nonmetal

IONIC BOND FORMATION Neutral atoms come near each other. Electron(s) are transferred from the Metal atom to the Non-metal atom. They stick together because of electrostatic forces, like magnets.

IONIC BONDING IS THE COMPOUND AN IONIC COMPOUND?METAL NONMETAL SUBSCRIPTS

IONIC BONDING Metals will tend to lose electrons and form positive ions CATIONS Normal sodium atom loses one electron to become sodium ion

IONIC BONDING Nonmetals will tend to gain electrons and form negation ions NEGATIVE ANIONS Normal chlorine atom gains an electron to become a chloride ion

IONIC BONDING Na +1 is called a sodium ion The +1 symbol means it has lost one electron

IONIC BONDING Mg +2 is called a magnesium ion The +2 symbol means it has lost two electron

IONIC BONDING S -2 is called a sulfide ion The -2 symbol means it has gained two electron

IONIC BONDING Cl -1 is called a chloride ion The -1 symbol means it has gained one electron

Properties of Ionic Compounds Crystalline lattice structure. High melting points. Conduct electricity when dissolved in water. Ex: NaCl (table salt)

COVALENT BONDING Share valence electrons Occur between nonmetals

COVALENT BONDING IS THE COMPOUND A COVALENT COMPOUND?NONMETAL NONMETAL YES since it is made of only nonmetal elements

Covalent bonding Fluorine has seven valence electrons F

Covalent bonding Fluorine has seven valence electrons A second atom also has seven FF

Covalent bonding l Fluorine has seven valence electrons l A second atom also has seven l By sharing electrons FF

Covalent bonding l Fluorine has seven valence electrons l A second atom also has seven l By sharing electrons FF

Covalent bonding l Fluorine has seven valence electrons l A second atom also has seven l By sharing electrons FF

Covalent bonding l Fluorine has seven valence electrons l A second atom also has seven l By sharing electrons FF

Covalent bonding l Fluorine has seven valence electrons l A second atom also has seven l By sharing electrons FF

Covalent bonding l Fluorine has seven valence electrons l A second atom also has seven l By sharing electrons l Both end with full orbitals FF

Covalent bonding l Fluorine has seven valence electrons l A second atom also has seven l By sharing electrons l Both end with full orbitals FF 8 Valence electrons

Covalent bonding l Fluorine has seven valence electrons l A second atom also has seven l By sharing electrons l Both end with full orbitals FF 8 Valence electrons

Polar Covalent Bonds UNEQUAL sharing of valence electrons. Ex: H 2 O Adhesion, cohesion, capillary action, surface tension….

Covalent Bond Properties Create MOLECULES Poor conductors of electricity Low melting points

Metallic Bonds Occur between metals Metals have a weak hold onto their valence electrons. Metal nuclei “float” in a “sea of electrons.”

Metallic Bond Properties Electrons are free to move through the solid. Metals conduct electricity

Why do atoms bond??? Octet Rule states that elements gain or lose electrons to create the valence electron arrangement (configuration) of the nearest noble gas. THEY NEED 8 VALENCE ELECTRONS TO BE STABLE Oct prefix means: “8”