Bellwork Tuesday To the right is a label from a popular food item. Name five elements that are found on this food label.

CHEMISTY I Unit 6 CHAPTER 9 CHEMICAL NAMES AND FORMULAS

Molecule- the smallest electrically neutral unit of a substance that still has the properties of that substance -made up of two or more atoms that act as a unit Ex. CH4 O2 H2O CO2 O3

9.3 Molecular compound- -usually composed of molecules -Have low melting & boiling points -Are usually made up of two or more NONMETALS Sugar, a compound made of carbon, hydrogen and oxygen, melts easily in a hot pan.

Which of the following is molecular and which is ionic? NaCl H2O CaCO3 CO Al2Cl3 CF4 O3

diatomic molecule –consists of two atoms of the same element (O2 and H2)

triatomic molecule- contain three atoms of the same element (O3, ozone)

Molecular Compounds and Acids Binary Molecular Compounds When naming binary molecular compounds, prefixes are used to tell how many of each atom is in the formula. CO2 carbon dioxide N2O4 dinitrogen tetroxide

The prefix mono- is never used with the first element The prefix mono- is never used with the first element. The prefix list in on page 159. 1- 6- 2- 7- 3- 8- 4- 9- 5- 10- hexa mono di hepta tri octa nona tetra penta deca

Example: PBr3 ICl3 P2O5 Sulfur hexafluoride tetraarsenic hexoxide phosphorous tribromide iodine trichloride diphosphorous pentoxide SF6 As4O6

9.4 Acids and Bases hydrochloric acid sulfuric acid nitric acid You need to know the names and formulas of these most common acids: HCl H2SO4 HNO3 HC2H3O2 H3PO4 hydrochloric acid sulfuric acid nitric acid acetic acid phosphoric acid

Covalent Two Nonmetals Example: Rule: Use _________ to tell the _________ of each element. _____________ Note: A prefix is NOT needed on the first element if there is only 1. 1= 6= 2= 7= 3= 8= 4= 9= 5= 10= Acids: contain the element ________ at the left of the formula Need to know: HCl: H2SO4: HNO3: HC2H3O2: H3PO4: