A s t h e s a yi n g g o e s c h e m i s t r y i s li

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A s t h e s a yi n g g o e s , C h e m i s t r y i s li k e c oo k i n g , j u s t d o n t li c k t h e s p oo n , w e cook different substances at certain proportions to form desired results. These proportions are strictly followed in obedience to the Law of Conservation of Mass and Law of Definite Proportions. Just by looking at the ingredients, we know how much of the other ingredients we will be needing in order to cook the dish well or how much final product we are going to make. Same goes with chemistry. This area of study in chemistry, which is very much related to cooking, is called stoichiometry (stoy·kee·aa·muh·tree): the quantitative study of reactants and products in a chemical reaction. The term came from the Greek words stoicheion , meaning “element”, and metron meaning “measure”. What’s In Almost everything around you involves chemistry. From the things you eat to the clothes you wear, the air you breathe and the ground you walk on, even the emotions from a heart break: all of these things involve chemistry. But to better appreciate chemistry lessons, you need to follow some simple rules: 1. Read the directions very carefully and follow the directions indicated in every activity. 2. Create a mental image of the concepts that are being discussed. This will help you better understand abstract concepts in chemistry. 3. Perform all of the activities in this module in the correct sequence. Doing this will help you scaffold your way up to more challenging tasks. Stoichiometry Lesson 1
Notes to the Teacher 4. Imagine your answer and compare it with the mental image of the concept you just learned. This will help you check your own work. If your imagination fails, you may use the answer key card in assessing your work, with the help of your facilitator or guardian. 5. Look for real-world examples of the concepts you have learned. This will make chemistry concepts more real to you and will also help you appreciate it more. 6. Have fun learning chemistry! In your Grade 10 Science, you learned how to balance chemical equations. This skill is essential in learning how to solve stoichiometric problems. To refresh your memories, try to balance the following equations below. 1. KClO 3 KCl + O 2 2. Al + O 2 Al 2 O 3 3. U + F 2= UF 6 4. FeCl 2 + Na 3 PO 4 Fe 3 (PO 4 ) 2 + NaCl 5. Na 2 CO 3 + Ca(OH) 2 NaOH + CaCO 3 6. Mg + HNO 3 H 2 + Mg(NO 3 ) 2 7. CaC 2 + H 2 O Ca(OH) 2 + C 2 H 2 8. S + O 2 SO 3 9. UO 2 + HF UF 4 + H 2 O 10. H 2 SO 4 + LiOH Li 2 SO 4 + H 2 O
What’s New Activity 1: Chicken Adobo ala Chem To better understand the relationship of chemistry (stoichiometry) and cooking, let us use the cooking of adobo as an analogy. Objectives : Relate stoichiometry to cooking Demonstrate the relationship between a reactant with another reactant/s, a reactant to a product, and vice versa Procedure: Observe and strictly follow the “adobo equation” Identify the amount of ingredients or product (adobo) that will be needed/produced using the given quantities Write your answer on the space provided + + + = 1 pound chicken 2 small packs Pepper corns 5 garlic clove s 1 piece onion 3 tbsp vinega r 4 tbsp Soy sauce 2 cups water 1 casserole Chicken adobo 4 pounds chicken = casserole C.A.

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