1. Classifying Chemical Reactions

2. Objective: SWBAT identify and classify reactions as synthesis, decomposition, single replacement or double replacement reactions by using relationships before and after the yield symbol. Do Now:1. Calculate how many mole of sodium chloride are in 33.2 g of NaCl. 2. Calculate the mass of 2.2 moles of LiBr. Homework: Read pages 65-74 in your workbook. Complete #s 1-16.

3. Introduction to the Chemical Reaction: A + B C + D Chemical reactions show how certain elements and compounds change chemically into new element and compound combinations. The most important principle of the chemical reaction is the conservation of matter, which means you will have the same number of elements before and after a reaction just different orientations. The yield symbol ( ) separates before the reaction happens, and after the reaction happens. Consider it as an = sign. The elements and compounds before the ( ) are called reactants. The elements and compounds after the ( ) are called the products. There are four types of chemical reactions: synthesis, decomposition, single replacement, double replacement. You can differentiate them by looking at patterns before and after the ( ).

4. Synthesis: A + B AB Decomposition: AB A + B Single Replacement: A + BC B + AC Double Replacement: AD + BC BD + AC

5. Classify the following reactions using the patterns of each type: N 2 (g) + H 2 (g) 2NH 3 (g) Pb(NO 3 ) 2 (aq) + NaCl(aq) NaNO 3 (aq) + PbCl 2 (s) Li(s) + 2H 2 O(l) LiOH(aq) + H 2 (g) Reaction Type Patterns Synthesis: A + B AB Decomposition: AB A + B Single Replacement: A + BC B + AB Double Replacement: AD + BC BD + AC

6. Activity A: Identify the following reactions. State your Evidence in the third column. Prepare to share and provide feedback to your elbow partner You have 5 minutes to complete the five classifications on your own. Think about your evidence. You will have 2 minutes to share with an elbow partner to confirm. We will share for 2 minutes.

7. Activity B:Predict the missing reagent based off of the information provided in the problem. Justify your response. Dont forget to criss-cross for a correct formula. You have 5 minutes to complete the four problems on your own. Think about your evidence. You will have 2 minutes to share with an elbow partner to confirm. We will share for 2 minutes.

8. Activity C:Write the chemical equations from the words provided. Use reference table E, S, and the Periodic table to help you finish. Classify the reaction. You have 5 minutes to complete the five problems on your own. Think about your evidence. You will have 2 minutes to share with an elbow partner to confirm. We will share for 2 minutes.

9. 1.) Classify the following 2 reactions: a.) Mg(OH)2 + 2HNO3 Mg(NO3)2 + 2HOH b.) 2NaHCO 3 + Heat Na 2 CO 3 + H 2 O + CO 2 2.) Determine the missing reagent: 2Al 2 S 3 4_____ + 6S