Week 4 Notes
Week 4 Notes CHM 151
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This 10 page Class Notes was uploaded by Stefanie Bennett on Sunday September 11, 2016. The Class Notes belongs to CHM 151 at Maricopa Community Colleges - Glendale Community College taught by Dr. Tina Palmer in Fall 2016. Since its upload, it has received 24 views. For similar materials see Intro to Chemistry in Chemistry at Maricopa Community Colleges - Glendale Community College.
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Date Created: 09/11/16
September 8, 2016 Thursday, Septembe4:57 PM16 • Kinetic Energy ○Thermal Energy – random motion of atoms. • Potential Energy ○Chemical Energy – stored within the structural unit of chemical substances. ○Electrostatic Energy – interaction between charged particles Law of Conservation of Energy – Energy cannot be created nor destroyed. It is conserved. Chapter 3 Page 1 Wave (a) = 714 nm Wave (b) = 503 nm Chapter 3 Page 2 Example 2: What is the wavelength of a purple light that has a 14 frequency of 6.88 x 10 Hz? Chapter 3 Page 3 September 6, 2016 Tuesday, August 30, 4:24 PM How many oxygen atoms are in 5.78 g of magnesium acetate? How many ions are in 2.50 g of CaBr ? 2 Chapter 2 Page 1 What is the mass of NO 2hat contains 3.56 x 10 oxygen atoms Any GAS at standard temperature and pressure (STP) occupies 22.41 L per mole 1. What volume does 2.50 grams of nitrogen gas occupy at STP? 2. How many water molecules are there in 35.7 L of water vapor at STP? Percent Composition: the mass percent of each element in a compound. “Part over whole times 100” Empirical Formula: the smallest whole number ratio of atoms in a given formula. Chapter 2 Page 2 Empirical Formula: the smallest whole number ratio of atoms in a given formula. Molecular Formula: gives the actual number of atoms in a given compound Example: C H 6 6 CH Example: A colorless liquid has a composition of 84.1% carbon and 15.9% hydrogen by mass. Determine the empirical formula. Also, assuming the molar mass of this compound is 114.2 g/mol, determine the molecular formula of this compound. Chapter 2 Page 3 Chapter 2 Page 4 September 8, 2016 Thursday, September 8,12:11 PM • potassium sulfate: K SO 2 4 • magnesium acetate: Mg(C H O ) 2 3 2 2 1. How many moles of carbon dioxide are in 3.75 g of CO ? 2 Chapter 2 Page 1 1. How many grams of Au are in a 9.86 mol sample of gold? 24 What is the mass of 2.23 x 10 formula units of potassium phosphate 1. How many oxygen atoms are in 5.78 g of magnesium acetate? 1. How many ions are in 2.50 g of CaBr ? 2 1. What is the mass of NO that contains 3.56 x 10 oxygen atoms? 2 1. What volume does 2.50 grams of nitrogen gas occupy at STP? Chapter 2 Page 2 2. How many water molecules are there in 35.7 L of water vapor at STP? Chapter 2 Page 3
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