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Download (Scavenger Hunt and Intro Balancing Equations). - stroh
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Catalyst – October 3+ 18, 2010 FUN GRAPH FRIDAY! 1. 2. In what month do you think red light cameras were installed in Renton, WA? What do you think happened to cause a decrease in citations (tickets) issued? Red light cameras were installed in Renton, WA and this graph shows the number of citations issued each month. Today’s Agenda Catalyst Projects into Ms. Stroh Scavenger Hunt Notes College Presentation Exit Question GOOD LUCK TO ACT TAKERS! Today’s Objectives SWBAT begin to apply law of conservation of mass to chemical reactions by balancing chemical equations. SCAVENGER HUNT! Whiteboard Practice How many total atoms of each element are in these compounds? AlCl3: Al = ? Cl = ? H2O: H = ? O = ? H2O2: H = ? O = ? KCl: K = ? Cl = ? Be3S2: Be = ? S = ? NH4NO3: N = ? H = ? O = ? Balancing equations RULES! Key Point #1: When balancing equations, never, Never, NEVER change subscripts, only coefficients! Yo, Ms. Stroh What is a coefficient? GOOD QUESTION! 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 AlCl3 Do you get it? 3 AlCl3 How many atoms of each element do they have? 3 Aluminum atoms 9 Chlorine atoms How many of each atom do we have now? 7 AlCl3 4 H2O 6 H2O2 5 KCl 2 Be3S2 4 (NH4)NO3 Why is the top equation wrong? You figure it out (5 min) We never want to leave an equation written like this… H2 + O2 H2O We want to have it like this… 2 H2 + O2 2 H2O WHY??? 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. Balancing Chemical Reactions H2 + O2 H2O __H__ __O__ Write down elements. Balancing Chemical Reactions H2 + O2 H2O __H__ __O__ How many are there? Balancing Chemical Reactions H2 + O2 H2O _2_H_2_ __O__ How many are there? Balancing Chemical Reactions H2 + O2 H2O _2_H_2_ _2_O_1_ How many are there? Balancing Chemical Reactions H2 + O2 H2O _2_H_2_ _2_O_1_ Get number equal! Balancing Chemical Reactions Try These: N2 + H2 NH3 P4O10 + H2O H3PO4 Ca3P2 + H2O Ca(OH)2 + PH3 Balancing Chemical Reactions Try These: N2 + 3H2 2NH3 P4O10 + H2O H3PO4 Ca3P2 + H2O Ca(OH)2 + PH3 Balancing Chemical Reactions Try These: N2 + 3H2 2NH3 P4O10 + 6H2O 4H3PO4 Ca3P2 + H2O Ca(OH)2 + PH3 Balancing Chemical Reactions Try These: N2 + 3H2 2NH3 P4O10 + 6H2O 4H3PO4 Ca3P2 + 6H2O 3Ca(OH)2 + 2PH3 COLLEGE PRESENTATION??? Exit Question 1. 2. Balance the following equations: __KClO3 ---> __KCl + __O2 __S + __O2 ---> __SO3 Leave Notes in Folder Please! GOOD LUCK ACT TEST TAKERS!!
