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Update your Table of Contents Write your homework – leave it to be stamped Get your test and your baby off the front counter if you want them! Review Endothermic Vs. Exothermic DateSession # ActivityPage # 10/27 - 10/28 22 Rate of Reaction Note/Lab Guide 36 Study Guide for Chemistry Test 3 37
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6CO 2 + 6H 2 O + energy --> 6O 2 + C 6 H 12 O 6 ◦ Anybody know what this the chemical equation for? ◦ Photosynthesis 6O 2 + C 6 H 12 O 6 --> 6H 2 O + 6CO 2 + energy ◦ Anybody know what this the chemical equation for? ◦ Cellular Respiration
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The last few classes we focused on the Law of Conservation of Mass/Matter, or the idea of “What Goes In, Must Come Out,” BUT the Law of Conservation of Mass does not tell us anything about why a reaction occurs in the first place or the rate/speed at which they occur…
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With your group, brainstorm things that you think affect the rate, or speed, of a chemical reaction!
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COLLISIONS BETWEEN MOLECULES ARE WHAT MAKE CHEMICAL REACTIONS OCCUR!
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Collisions are a factor in ALL reactions, but the other 5 factors below affect the speed/rate at which these collisions and therefore the reactions occur: ◦ Concentration ◦ Temperature ◦ Pressure ◦ Surface Area ◦ Catalysts
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Collision Theory – molecules bumping into each other lead to chemical reactions How does this affect the Rate of Reaction? ◦ More collisions = more reactions ◦ Less collisions = less reactions
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Concentration – the amount or strength of the chemical How does this affect the Rate of Reaction? Higher Concentration = more collisions = increased reaction rates Lower Concentration (dilute) = less collisions = decreased reaction rates
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Temperature – how hot/cold a substance is due to movement of particles ◦ What happens to particle movement when something is heated? How does this affect the Rate of Reaction? Higher Temperature = more collisions = increased reaction rates Lower Temperature = less collisions = decreased reaction rates
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Pressure – a force on substances depending on the amount of space they have to move ◦ How do objects under pressure react? (Hint: think of open vs. closed container) How does this affect the Rate of Reaction? Higher Pressure = more collisions = increased reaction rates Lower Pressure = less collisions = decreased reaction rates
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Surface Area – the area that an object occupies How can you increase an objects surface area? How does this affect the Rate of Reaction? Increased surface area = more collisions = increased reaction rates Decreased surface area = less collisions = decreased reaction rates
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CHEMICAL REACTIONS NEED ENERGY TO OCCUR!
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Catalysts – a substance that acts as a “matchmaker” to jump start a reaction or make it faster (lowers the amount of energy needed) Catalysts are not affected or used during the reaction – they are still left over Inhibitors are the opposite – how would you describe/define them?
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https://www.youtube.com/watch?v=OttRV5y kP7A
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Group Leader – manages the group, reads the directions, makes sure everyone records data Supply Manager – responsible for getting, returning and clean-up of supplies Data Technician – Records your group’s data on the class data table on the board as soon as you have it! Timekeeper – someone with a timer/stopwatch on their phone to time the reaction
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Send your supply manager to get 2 test tubes - some of you will receive solutions B1 & C and some of you will receive solutions B2 & C Pour one of the solutions into the other and back again so all of the liquid is in one test tube…START YOUR TIMER IMMEDIATELY! You must watch your experiment until you see the color change. If you are not paying attention, you will miss it! Record the reaction times on your data table & decide as a group which factor affected the reaction rate!
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Send your supply manager to get your glue/water mixture, Borax and a popsicle stick. Mix the Borax into the glue/water mixture and stir with the popsicle stick. The borax DOES NOT BOND with the glue….it bonds the water with the glue, but is not part of the reaction….it is in the leftover liquid – What role does the Borax play in this reaction?
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Independent Variable What is Affecting the Reaction Rate? TemperatureTime for Reaction to Complete Powdered AlkaSeltzer Tablet N/A Broken AlkaSeltzer Tablet N/A Whole Alka Seltzer Tablet N/A Alka Seltzer in Hot Water HOT Alka Seltzer in Room Temp Water Room Temp Alka Seltzer in Cold Water COLD Alka-Seltzer in Film Canister 1 N/A Alka-Seltzer in Film Canister 2 N/A
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Complete the Study Guide Review for Chemistry Test 3 next class!
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Update your Table of Contents Write your homework – leave it to be stamped Get your Study Guide out to be checked Review with your Table Partners while I’m checking the homework DateSession # ActivityPage # 10/29 - 10/30 23 Testing Session (nothing to tape in)
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HgO + Cl 2 HgCl + O 2
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PbBr 2 +HClHBr + PbCl 2
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Na 3 P + CaF 2 NaF + Ca 3 P 2
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Energy is a reactant Temperature decreases, so it feels cool/cold Example: Photosynthesis Energy is a product Temperature increases, so it feels warm/hot Example: Cellular Respiration
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Collision Theory = all reactions take place due to collisions between molecules, but some things are able to increase or decrease the amount of collisions: ◦ Concentration = amount or strength ◦ Temperature = is due to particle movement ◦ Surface Area = break things into pieces to increase the surface area ◦ Pressure = the amount of space the particles have to move in (open vs. closed container) ◦ Catalyst = makes reactions go faster ◦ Inhibitor = makes reactions go slower
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Phone number: 37607 Message: ◦ Text the number of your answer choice for multiple choice questions ◦ For open ended questions simply type your answer
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Please clear your desk of everything but your pencil and the blank periodic table I give you Please put the folders up between you and your table partners. WHEN YOU FINISH: ◦ Put your test in the basket and make a pile of unused periodic tables next to the basket ◦ Read the hand out on Energy, we will be attending a play next week
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