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WARM - UP. Update your Table of Contents Write your homework – leave it to be stamped Get your homework out to be checked ! On your whiteboard, please draw a T-Chart compare and contrast endothermic & exothermic reactions with your table partner. Review….

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warm up
WARM - UP
  • Update your Table of Contents
  • Write your homework – leave it to be stamped
  • Get your homework out to be checked!
  • On your whiteboard, please draw a T-Chart compare and contrast endothermic & exothermic reactions with your table partner
review
Review…
  • The last few classes we focused on 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…

endothermic or exothermic
Endothermic or Exothermic?
  • 6CO2 + 6H2O + energy --> 6O2 + C6H12O6
    • What is this the chemical equation for?
    • Photosynthesis
  • 6O2 + C6H12O6 --> 6H2O + 6CO2 + energy
    • What is this the chemical equation for?
    • Cellular Respiration
rate of reaction
Rate of Reaction
  • The Rate of Reaction (speed) is dependent on the number of collisions between the molecules. What variables would increase/decrease the number of successful collisions?
  • With your group, brainstorm a list of things that you think affect the rate, or speed, of a chemical reaction and write them on your whiteboard!
what affects the rate of reaction
What Affects the Rate of Reaction?
  • Many factors affect the rate of a chemical reaction, but you are responsible for knowing the 5 listed below:
    • Concentration
    • Temperature
    • Pressure
    • Surface Area
    • Catalysts
collision theory
“Collision Theory”
  • What makes these reactions occur again?
    • Collisions between molecules – (molecules are bumping into each other and their valence electrons are bonding leading to a chemical reaction)
  • And how does this affect the Rate of Reaction?
    • More collisions = more reactions at a faster rate
    • Less collisions = less reactions at a slower rate
rate of reaction webquest
Rate of Reaction WebQuest
  • Use your technology to complete Parts 1-3 on your note guide
  • You may work with anyone so that you can share technology.
  • You have 20 minutes
concentration
Concentration

Increasing the concentration (amount of a substance) increases the reaction rate…HERE’S WHY:

  • Packing more particles of a substance into the same amount of space
  • Causes particles to bump into each other more often (collision theory)
  • More contact = more reaction taking place

So what does decreasing the concentration do?

temperature
Temperature

Increasing the temperature, increases the reaction rate…HERE’S WHY:

  • Particles speed up, become hyper, move around more
  • Particles then bump into each other more (collision theory)
  • More contact = more reaction taking place

So what does decreasing the temperature do?

pressure
Pressure

Increasing thepressure, increases the reaction rate…HERE’S WHY:

  • Particles have less space to move in
  • Particles then bump into each other more (collision theory)
  • More contact = more reaction taking place

So what does decreasing thepressuredo?

catalysts
Catalysts

Adding a catalyst increase the rate of reaction…HERE’S WHY:

  • Catalysts act as a “matchmaker” to jump start a reaction or make it faster
  • Without them reactions would be slower or not happen at all
  • Catalysts are not affected or used during the reaction – they are still left over

Inhibitors are the opposite – how would you describe/define them?

surface area
Surface Area

Increasing the surface area (by breaking something into multiple pieces) increases the reaction rate…HERE’S WHY:

  • More surface exposed means greater chance for particles to contact each other (collision theory)
  • More contact = more reaction taking place
rate of reaction investigations
Rate of Reaction Investigations
  • 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 – takes any measurements necessary (temperature) and reports your group’s data to Ms. Sarnelli’s computer
  • Timekeeper – someone with a timer/stopwatch on their phone to time the reaction
iodine clock
Iodine Clock –
  • 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!
flubber
Flubber
  • 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?
homework
Homework:
  • Review your Chemistry Vocabulary List so that you are prepared for the “Starburst Speedword” next class, AND the last test!
warm up1
WARM - UP
  • Update your Table of Contents
  • Write your homework – leave it to be stamped
  • Get your Review Packet out to be checked!