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Catalyst – October 5 2, 2010 Monday Mystery Element! 1. Like most rare earth metals, used to make phosphors in TVs 2. Ferromagnetic (attracted to magnets) 3. Tarnishes slowly, oxide flakes off
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Catalyst – October 5 2, 2010 Monday Mystery Element! 1. Like most rare earth metals, used to make phosphors in TVs 2. Ferromagnetic (attracted to magnets) 3. Tarnishes slowly, oxide flakes off GADOLINIUM (#64)
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Today’s Agenda Catalyst New Groups Diving into Balancing Equations Practice Exit Question TONIGHT’S HW: BALANCING WORKSHEET
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Today’s Objectives SWBAT apply law of conservation of mass to chemical reactions by balancing chemical equations.
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White Board Door into class LR 3 rd Period Group 4 Kendell, Tracy, Shawn, Sara Group 3 Allesandro, Melvin, Paula, Tashelle Group 1 Ariel, Kiedra, Bao, Amber Group 2 Chicobi, Corey, Marissa, Jamie Group 5 Warren, Tigler, Quanetta, Jasmine, Waynell Group 6 Ebony, Brandon, Kara, Melvin Group 8Group 7Group 9
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White Board Door into class LR 4 th Period Group 4 Stephanie, Kim, Lizzeh, Eddie Group 3 Jeremy, Roniece, Lyndon, Kourtney Group 1 Kentrell, Khallid, Rachel, Kim Group 2 Caleb, Infinity, Dwanyetta, Troy Group 5 Jytte’, Jaron, Artrel, Nia Group 6 Josh’shawn, Aaron, Jon, Chelsie Group 8 Rodrea, Lester, Chelsie Group 7 Chelsie, Shannon, Sam, Darreal Group 9
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REVIEW: Balancing equations RULES! Key Point #1: When balancing equations, never, Never, NEVER change subscripts, only coefficients!
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Coefficient A coefficient is a whole number that comes in front of the compound formula, never in the middle! You multiply the coefficient to all the numbers in the compound 2 AlCl 3
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REVIEW: L-C-M!!! Key Point #2: Chemical reactions MUST follow the Law of Conservation of Matter. What is the LCM? Matter cannot be created or destroyed. If 3 carbons are in the reactants of a reaction, then there darn well better be 3 carbons in the products of a reaction.
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Independent Practice Worksheet!
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Balancing with diatomics… Key Point #1: Sometimes with diatomics, you must be a little tricky. C 4 H 10 + O 2 CO 2 + H 2 O
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Diatomics If you reach the point in a balance problem where everything is balanced except the diatomic atom... You can only get even numbers with diatomics… 2 O 2 = 4 O atoms 3 O 2 = 6 O atoms And sometimes the other side is odd Use a fraction, then multiply by 2
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Example: Work it out… C 4 H 10 + O 2 CO 2 + H 2 O
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Your Turn… 1. C 6 H 6 + O 2 CO 2 + H 2 O 2. C 10 H 22 + O 2 CO 2 + H 2 O
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Balancing with some hot sauce… What if you have some polyatomic ions? WHAAAAAAAAT will you do?? Key Point #2: When balancing equations that involve polyatomic ions, keep them together!
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Work it out… ___ H 3 PO 4 + ___ KOH ___ K 3 PO 4 + ___ H 2 O Which polyatomics are we using? PO 4 – phosphate OH – hydroxide Where is the OH on the other side? It’s OK – rewrite H 2 O as HOH – Trust me!
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Work it out… __ H 3 (PO 4 ) + __ K(OH) __ K 3 (PO 4 ) + __ H(OH) Which polyatomics are we using? PO 4 2- – phosphate OH 1- – hydroxide
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Your Turn! Write a blank before each formula… 1. HCl + NaOH NaCl + H 2 O 2. NaOH + H 2 CO 3 Na 2 CO 3 + H 2 O 3. Al(OH) 3 + H 2 CO 3 Al 2 (CO 3 ) 3 + H 2 O
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Class/Homework Time! WORKSHEET! You must complete 24 problems for HW…extra points for extra problems!
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Exit Question Balance one of the following equations: 1. __KClO 3 ---> __KCl + __O 2 2. __S 8 + __O 2 ---> __SO 3 HOMEWORK: BALANCING WKSHT (24 Problems)
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