Warmup – write out the answer Identify these compounds as covalent or ionic 1.SiO 2 is _____ 2.FeS 2 is _____ 3.cobalt(III) chlorate is _______ 4.H 2 O is _______ An ionic bond is____ a)metal cations attraction to free floating valence electron cloud. b)non-metal elements sharing their electrons to make an octet c)the attraction between cations and anions

Objective 6.5 To know the properties of covalent compounds. To be able to write names for covalent compounds

What is the objective for today? A.to learn properties of covalent compounds B.to learn how to name covalent compounds C.to learn as little as possible D.both A and B are correct

An Ionic bond is….. A.metal cations attraction to free floating valence electron cloud. B.non-metal elements sharing their electrons to make an octet C.the attraction between cations and anions

Which of these compounds is ionically bonded? A.Si 3 O 2 B.FeS 2 C.cobalt(III) chlorate D.H2O

cobalt(III) chlorate Where do you find the formula and charge for ‘chlorate’ A.From the list on the back of your periodic table: ClO 3 charge is -1. B.it must be Cl 8 for chlorine eight C.Chlorate is Cl -

I.What is a Covalent Compound? A covalent compound is a compound composed of molecules. A molecule is a neutrally bonded group of atoms that act as a unit.

Some examples of covalent compounds: H 2 OWater NO 2 nitrogen dioxide

 Millions of the same molecules grouped together make up a covalent compound.

Unlike ionic compounds, covalent compounds are composed of only nonmetallic elements.

What elements are covalent compounds composed of? A.metals only B.non-metals only C.metals and non-metals D.cations and anions

Covalent (molecular) compounds: –Relatively low melting and boiling points –Exist as gas or liquids at room temperature –Poor conductors of electricity

Which is true about the properties of covalent compounds? [ A.form crystals at room temperature B.relatively low melting point, usually gas or liquid at room temperature C.poor conductors of electricity D.good conductors of electricity

 When more than one nonmetallic element combines, they can do so in more than one way. COCO 2

 These two covalent compounds are composed of the same two elements, but they have completely different chemical properties.  What problem does this present when trying to distinguish between these two compounds? COCO 2

 These two covalent compounds are composed of the same two elements, but they have completely different chemical properties.  What problem does is presented when trying to distinguish between these two compounds? Naming them

Two covalent compounds: SO 2 and SO 3 Would you expect them have the same chemical properties? A.Yes B.No

 What name would be given to CO and CO 2 using the same naming rules for ionic compounds?

Carbon Oxide  But which one gets to use this name?

 Obviously, a new naming system is needed for covalent compounds.

 When naming covalent compounds, prefixes are used to distinguish between different compounds.

 These prefixes indicate the number of atoms of each element used to compose a particular molecule. PrefixNumber Mono-1 Di-2 Tri-3 Tetra-4 Penta-5 Hexa-6 Hepta-7 Octa-8 Nona-9 Deca-10

What name would you now give to CO and CO 2 using prefixes? CO CO 2

What name would you now give to CO and CO 2 using prefixes? COCarbon Monoxide CO 2

What name would you now give to CO and CO 2 using prefixes? COCarbon Monoxide CO 2 Carbon Dioxide

1.Usually, if there is only one of the first element, the prefix mono- is omitted.

2.The names of all covalent binary compounds end with –ide.

1.Usually, if there is only one of the first element, the prefix mono- is omitted. 2.The names of all molecular binary compounds end with –ide. 3.The vowel at the end of the prefix is sometimes dropped when the name of the element also begins with a vowel.

Name the following covalent compounds. 1.SF 2 2.PCl 3 3.CCl 4 4.Cl 2 O 8

Name the following covalent compounds. 1.SF 2 Sulfur Difluoride 2.PCl 3 3.CCl 4 4.Cl 2 O 8

Name the following covalent compounds. 1.SF 2 Sulfur Difluoride 2.PCl 3 Phosphorus Trichloride 3.CCl 4 4.Cl 2 O 8

Name the following covalent compounds. 1.SF 2 Sulfur Difluoride 2.PCl 3 Phosphorus Trichloride 3.CCl 4 Carbon Tetrachloride 4.Cl 2 O 8

Name the following covalent compounds. 1.SF 2 Sulfur Difluoride 2.PCl 3 Phosphorus Trichloride 3.CCl 4 Carbon Tetrachloride 4.Cl 2 O 8 Dichlorine Octoxide

Write the chemical formula using the following compound names. 5.Nitrogen triodide 6.Diselenium dichloride 7.Dinitrogen tetroxide 8.Sulfur trioxide

Write the chemical formula using the following compound names. 5.Nitrogen triodideNI 3 6.Diselenium dichloride 7.Dinitrogen tetroxide 8.Sulfur trioxide

Write the chemical formula using the following compound names. 5.Nitrogen triodideNI 3 6.Diselenium dichlorideSe 2 Cl 2 7.Dinitrogen tetroxide 8.Sulfur trioxide

Write the chemical formula using the following compound names. 5.Nitrogen triodideNI 3 6.Diselenium dichlorideSe 2 Cl 2 7.Dinitrogen tetroxideN 2 O 4 8.Sulfur trioxide

Write the chemical formula using the following compound names. 5.Nitrogen triodideNI 3 6.Diselenium dichlorideSe 2 Cl 2 7.Dinitrogen tetroxideN 2 O 4 8.Sulfur trioxideSO 3