+ Chapter 7: The Mole and Chemical Composition + Warm-Up (10/13/14) What things do we count in dozens? What does a chemical formula tell us about a molecule? + Reading a Chemical Formula KClO 4 Subscripts indicate how many of that element there are; No number means there is one Different elements start with a capital letter Almost always chlorine; we will rarely see Carbon-Iodine + Reading a Chemical Formula KClO 4 Subscripts indicate how many of that element there are; No number means there is one How many of each element is represented by this molecular formula? + Reading a Chemical Formula SO 4 -2 Subscripts indicate how many of that element there are; No number means there is one How many of each element is represented by this molecular formula? Numbers above indicate the charge of an ion + The Mole (not that thing on my face) ___________ is the standard SI unit for measuring the amount of a substance KClO 4 This is ONE mole of the molecule KClO 4 + Converting Moles to grams We need the periodic table! The mass number tells us the MOLAR MASS of an element Molar mass is expressed in units g/mol Mass number/ Atomic Mass Atomic number (#protons) + Converting grams to moles In-Class example How many MOLES of carbon are in a 72g sample of carbon? + Converting moles to grams In-Class example How many grams of beryllium (Be) are in 5 moles of beryllium? + Extra Practice Determine how many moles of fluorine are present in a 57 gram sample of fluorine. + Extra Practice * How many grams of oxygen are present in 3 moles of O 2 gas? + EXIT SLIP (answers) Show your work How many moles of nitrogen are present in a 35g sample of nitrogen? How many grams are present in one mole of CH 4 ? + Warm-Up (10/14) How many grams of Sulfur are present in 3 moles of sulfur? (Must show all work to receive credit) + Review Chemical formulas tell us which _____________ are in a molecule and how many of each atom/element there are. The molar mass is used to express the amount of ____________ for one ______________ of a substance. It is often expressed in the units g/mol. To find the molar mass of an element, we must look at the _______________________. + Molar Mass of Molecules To find the molar mass of molecules, we simply total the molar masses of each individual atom/element. Please use the molecule CH 4 for the table below. + Molar Mass Unit Conversions How many grams of carbon dioxide are present in 2 moles of CO 2 ? + Molar Mass Unit Conversions How many moles of CH 3 F are present in 68 grams of CH 3 F? + BIG Warm-Up (10/15/14) Find the molar mass of glucose (C 6 H 12 O 6 ). Include units How many grams are present in 2 moles of C 2 H 5 NO 2 + Warm-Up (10/16/14) How many grams are present in 2 moles of aspirin [ C 9 H 8 O 4 ]? + HOT CHEETOS. Stop eating them. + DUE TODAY: Determine the molar mass and find out how many grams are in 2 moles of each. EXTRA CREDIT: Research side effects of these (after calculations) Ferrous Sulfate (FeO 4 S ) Niacin ( C 6 NH 5 O 2 ) Monosodium Glutamate ( C 5 H 8 NO 4 Na) Folic Acid ( C 19 H 19 N 7 O 6 ) + EBOLA MYTHS MYTH: Ebola virus is airborne spreads through regular contact TRUTH: Ebola spreads when body Fluids come into contact with mucous membranes of a non-infected person MYTH: America is at risk for an Ebola outbreak TRUTH: The outbreak in West Africa happened due to the lack of healthcare resources. 1 st Symptoms: Fever fatigue, muscle pain, headache, sore throat. Then vomiting, diarrhea, impaired kidney/liver function, internal & external bleeding + Happy Friday This is what is due NOW (10 min): Warm-Ups (10/13-10/16) [4 total] HW #19, 20,21 (Guided Notes WS) + Ex. How many moles are in 32 grams of CH 4 ? 1. Always start with what youre given 2. For the conversion factor, write the units we WANT (unknown) on top; units we start with should go on the bottom 3. Find the molar mass so you can determine how many grams are in 1 mole of the substance 4. Plug in the appropriate numbers 5. Execute the math; cancel out units. Check your math.