Presentation on theme: "In groups discuss: How would you define a compound? Use some key vocabulary terms from the first chemistry test to help you. If H2O and H2O2 are both."— Presentation transcript:
1In groups discuss:How would you define a compound? Use some key vocabulary terms from the first chemistry test to help you.If H2O and H2O2 are both compounds, how are they different?How do atoms combine to form compounds?How do ionic bonds and covalent bonds differ? How are they the same?Think back to our global warming project. What compounds (greenhouse gases) have we already studied? Explain how the electrons move in order for each of the greenhouse gases to form. Label each greenhouse gas as an ionic or covalent bond.
2Adapted from http://sciencespot.net/ Bonding Basics8th Grade ScienceAdapted from
3Section A: Complete the chart using a periodic table to help you.
4NEGATIVE POSITIVE ION CATION ANION Answer these questions:An atom that gains one or more electrons will have a ____________________ charge.An atom that loses one or more electrons will have a ____________________ charge.An atom that gains or loses one or more electrons is called an ____________.A positive ion is called a ______________ and a negative ion is called an _______________.NEGATIVEPOSITIVEIONCATIONANION“An-Eye-On”“Cat-Eye-On”
5ELECTRONS COMPLETE METAL NONMETAL What is an ionic bond?Atoms will transfer one or more ________________ to another to form the bond.Each atom is left with a ________________ outer shell.An ionic bond forms between a ___________ ion with a positive charge and a ________________ ion with a negative charge.Example B1: Sodium + Chlorine Example B2: Magnesium + IodineELECTRONSCOMPLETEMETALNONMETAL
6Example B3: Potassium + Iodine Example B4: Sodium + Oxygen Example B5: Calcium + Chlorine Example B6: Aluminum + Chlorine
7SHARE COMPLETE NONMETAL What is a covalent bond?Atoms ___________ one or more electrons with each other to form the bond.Each atom is left with a ________________ outer shell.A covalent bond forms between two _________________.Example C1: Hydrogen + Hydrogen Example C2: 2 Hydrogen + OxygenSHARECOMPLETENONMETAL
8Example C3: Chlorine + Chlorine Example C4: Oxygen + Oxygen Example C5: Carbon + 2 Oxygen Example C6: Carbon + 4 Hydrogen
9Bond With A Classmate Purple = Cations ; Pink = Anions Find a classmate to “bond” with and together decide on the correct chemical formula (use the oxidation numbers to help you!)You will have to decide how many of each ion you need to make a STABLE IONIC BOND.Record all bonds on your Date Book (data table)Look at the box on your paper for helpful hintsYou will have 5 minutes to make as many bonds as possible.
10Review Vocab… What is an oxidation number? How is it determined? What is a subscript? What does it tell you about the atoms in the compound?What is a chemical formula?
11Oxidation NumbersSame thing as typical charge an atom will have once it has lost or gained electronsShortcut to writing chemical formulas:1. Ca I2. Ca+2 I1-3. Ca I1-Ca1 I2CaI2
13Oxidation #’s Backwards Give me the oxidation state (charge) for each atom (polyatomic ion) in the compound for the following chemical formulas:Zn(OH)2BeSO4Mg3P2MgBr2KClNH4OH
14Naming Ionic Compounds Metal and nonmetal: Name the metal and change the nonmetal to –ideTransition metals and nonmetals: Use roman numerals to represent the charge and name the nonmetal using –idePolyatomic Ions : If positive are more like metals and come first, if negative are more like nonmetals and come second. They have their own names and oxidation numbers (see chart on back)
15Naming Ionic Bonds Practice What is the chemical formula for the compound that results when Magnesium and Chlorine combine? Use the lewis dot structures and the criss cross method to show how you get the same formula.How do you name this compound?
19Naming Covalent Compounds Guidelines for Inorganic Compounds 1Mono-2Di-3Tri-4Tetra-5Penta-6Hexa-7Hepta-8Octa-9Nona-10Deca-In covalent compounds, the least electronegative element comesfirst and its name is unchanged.2. The more electronegative element comes second and takes on the–ide ending like in ionic bondsSubscripts are represented byGreek prefixesExample: H2O –dihydrogen monoxide
20Name that Compound Can you use the inorganic guidelines for all of these? 4. CH4
21Show me the formula hexaboron silicide chlorine dioxide hydrogen iodideiodine pentafluoridedinitrogen monoxide