Molar Mass and Chemical Reactions September 19, 2012 Ms. Boon Chemistry

Catalyst Pick up your assignment report. Pick up your assignment report. Make a list of at least 3 things you are proud of concerning your academic achievements this year. Make a list of at least 3 things you are proud of concerning your academic achievements this year. Make a list of at least 3 things you would like to improve about your school work. Make a list of at least 3 things you would like to improve about your school work.

Shout Outs! (Period 2) The following students demonstrated mastery (3 or 4) of all the Unit 2 standards on their Unit 2 exam: The following students demonstrated mastery (3 or 4) of all the Unit 2 standards on their Unit 2 exam: Edgardo Aguilar & Denise Montes Edgardo Aguilar & Denise Montes The following students have demonstrated mastery of all Unit 2 standards on average: The following students have demonstrated mastery of all Unit 2 standards on average: Christian Romo, Zamir Ramirez, Rumaldo Godinez, and Susan Castellanos Christian Romo, Zamir Ramirez, Rumaldo Godinez, and Susan Castellanos

Shout Outs! (Period 3) The following students demonstrated mastery (3 or 4) of all the Unit 2 standards on their Unit 2 exam: The following students demonstrated mastery (3 or 4) of all the Unit 2 standards on their Unit 2 exam: Eduardo Cabral, Irma Castillo, Christopher Orellana, & Diana Portillo Eduardo Cabral, Irma Castillo, Christopher Orellana, & Diana Portillo The following students have demonstrated mastery of all Unit 2 standards on average: The following students have demonstrated mastery of all Unit 2 standards on average: Douglas Garcia, Gerardo Garcia, Christopher Orellana, Diana Portillo, and Andres Valencia Douglas Garcia, Gerardo Garcia, Christopher Orellana, Diana Portillo, and Andres Valencia

Shout Outs! (Period 4) The following students demonstrated mastery (3 or 4) of all the Unit 2 standards on their Unit 2 exam: The following students demonstrated mastery (3 or 4) of all the Unit 2 standards on their Unit 2 exam: Karla Giron, Kiemon Gordon & Abel Martinez Karla Giron, Kiemon Gordon & Abel Martinez The following students have demonstrated mastery of all Unit 2 standards on average: The following students have demonstrated mastery of all Unit 2 standards on average: Patrick Jones, Antonio Ojeda, Luis Orellana, and Briceida Pacheco Patrick Jones, Antonio Ojeda, Luis Orellana, and Briceida Pacheco

Shout Outs! (Period 5) The following students demonstrated mastery (3 or 4) of all the Unit 2 standards on their Unit 2 exam: The following students demonstrated mastery (3 or 4) of all the Unit 2 standards on their Unit 2 exam: Luis Ayala, Jonathan Mendez, Alberto Payan, Surmani Sanford, Angel Tapia & Xochilt Villafana Luis Ayala, Jonathan Mendez, Alberto Payan, Surmani Sanford, Angel Tapia & Xochilt Villafana The following students have demonstrated mastery of all Unit 2 standards on average: The following students have demonstrated mastery of all Unit 2 standards on average: Angel Tapia Angel Tapia

Shout Outs! (Period 6) The following students demonstrated mastery (3 or 4) of all the Unit 2 standards on their Unit 2 exam: The following students demonstrated mastery (3 or 4) of all the Unit 2 standards on their Unit 2 exam: Melissa Alvarez, Kevin Chavez & Sabrina Montgomery Melissa Alvarez, Kevin Chavez & Sabrina Montgomery The following students have demonstrated mastery of all Unit 2 standards on average: The following students have demonstrated mastery of all Unit 2 standards on average: Melissa Alvarez, Kevin Chavez, Deya Garcia, Sabrina Montgomery, & Christine Romo Melissa Alvarez, Kevin Chavez, Deya Garcia, Sabrina Montgomery, & Christine Romo

Objectives I can use my periodic table to calculate the molar mass of any element, compound, or molecule. I can use my periodic table to calculate the molar mass of any element, compound, or molecule.

Agenda Catalyst & Shout Outs Catalyst & Shout Outs Homework Review Homework Review Molar Mass Puzzle Activity Molar Mass Puzzle Activity Exit Slip Exit Slip

HW Review: Read pp ; problems: pp. 233 #11, pp. 240 #5 & 10(a, b, c, & e) (233) 11. The mass of x molecules of ibuprofen is g. (To solve, we must remember that x molecules = 1 mole and that the mass of 1 mole of a molecule is whatever that molecule’s molar mass is. The question gave us the molar mass as g/mol.)

HW Review: Read pp ; problems: pp. 233 #11, pp. 240 #5 & 10(a, b, c, & e) 5. What is the ratio of N and H atoms in NH 3 ? 1N:3H For every N atom there are 3 H atoms.

HW Review: Read pp ; problems: pp. 233 #11, pp. 240 #5 & 10(a, b, c, & e) 10(a). Molar mass of CsCl -- Answer: g/mol Steps to Solve: (1) Find the molar mass of the individual elements. Use the periodic table. The molar mass is the same as the average atomic mass. Just change the units from amu to g/mol. Cs = g/molCl = g/mol (2) Use the compound formula to determine how many of each element is in the compound. CsCl is a 1:1 ratio of Cs and Cl (there are no subscript numbers telling us differently) (3) Add the molar masses in the correct ratio. 1 mol Cs = g 1 mol Cl = g g g = g/mol (rounded = g/mol)

More HW Review: 240 #10 (b) Molar mass of KClO 3 ? Answer: g/mol Steps to Solve: (1) Find the molar mass of the individual elements. Use the periodic table. The molar mass is the same as the average atomic mass. Just change the units from amu to g/mol. K = g/molCl = g/molO = g/mol (2) Use the compound formula to determine how many of each element is in the compound. KClO 3 1K: 1Cl: 3O (3) Add the molar masses in the correct ratio. 1 mol K = g 1 mol Cl = g 3 mol O = g x 3 = g g g g = g/mol (c) Molar mass of C 6 H 12 O 6 ? Answer: g/mol (e) Molar mass of C 2 H 5 NO 2 ? Answer: g/mol

Molar Mass Puzzle! Instructions: Instructions: Work with a partner Work with a partner You will receive a stack of puzzle pieces. You will receive a stack of puzzle pieces. Half have an element or compound formula and the other half have the molar mass. Half have an element or compound formula and the other half have the molar mass. Match the formula with the molar mass. Match the formula with the molar mass. Write the answers down. Write the answers down. When you think you have all the answers, raise your hand and Ms. Boon will check. When you think you have all the answers, raise your hand and Ms. Boon will check.

Exit Slip 1.What is the molar mass of Potassium? 2.What is the molar mass Potassium Chloride (KCl)? 3.What is the molar mass of ozone (O 3 )? 4.The molar mass of NaCl is g/mol. What is the mass of 2 moles of NaCl? 5.One mole of water contains 6.02 x molecules. How many water molecules are in 3 moles of water?