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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
WARM - UP
Date Session#
Activity Page#
10/16 -10/17
19 Rate of Reaction Note/Lab Guide 31
Chemistry Vocabulary List 32
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…
Review…
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
Endothermic or Exothermic?
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!
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
What Affects the Rate of Reaction?
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
“Collision Theory”
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
Rate of Reaction WebQuest
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?
Concentration
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?
Temperature
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?
Pressure
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?
Catalysts
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
Surface Area
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
Rate of Reaction Investigations
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!
Iodine Clock –
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?
Flubber
1st Block Data Table (A-day)Independent
VariableWhat is Affecting
the Reaction Rate?
Temperature Time for Reaction to Complete
Powdered AlkaSeltzer Tablet
concentration N/A 55.5 seconds
Broken AlkaSeltzer Tablet
SURFACE AREA
N/A 34 seconds
Whole Alka Seltzer Tablet
Surface Area N/A
Room Temp Water Temperature Room Temp.
Cold Water TEMPERATURE Cold 47
Hot Water Hot 26.26
AlkaSeltzer in Film Canister
Surface area concentration
N/A 12.34 SECONDS
Denture Cleaner in Film Canister
Concentration, pressure
N/A 6 min
3rd Block Data Table (A-day)Independent
VariableWhat is Affecting
the Reaction Rate?
Temperature Time for Reaction to Complete
PowderedAlka Seltzer Tablet
surface area N/A 19 seconds
BrokenAlka Seltzer Tablet
Surface area N/A 37 Seconds
Whole Alka Seltzer Tablet
concentration N/A 42 seconds
Room Temp Water Temperature Room Temp. 37.39
Cold Water Temperature Cold 50 Seconds
Hot Water Temperature Hot 1 minute 31 seconds
Alka Seltzer in Film Canister
Pressure N/A 7.97 seconds
Denture Cleaner in Film Canister
N/A
4th Block Data Table (A-day)Independent Variable
What is Affecting the Reaction
Rate?
Temperature Time for Reaction to Complete
PowderedAlka Seltzer Tablet
Surface area N/A 25.97 seconds
BrokenAlka Seltzer Tablet
Surface Area N/A 37 seconds
Whole Alka Seltzer Tablet
pressure N/A 34 Seconds
Room Temp Water Surface AreaTemperature
Room Temp. 35 seconds
Cold Water temperature Cold 1 minute and 15 seconds
Hot Water Surface temperature
Hot 13 seconds
Alka Seltzer in Film Canister
pressure N/A 17 seconds
Denture Cleaner in Film Canister
N/A
1st Block Data Table (B-day)Independent
VariableWhat is Affecting
the Reaction Rate?
Temperature Time for Reaction to Complete
Powdered AlkaSeltzer Tablet
N/A
Broken AlkaSeltzer Tablet
N/A
Whole Alka Seltzer Tablet
N/A
Room Temp Water Room Temp.
Cold Water Cold
Hot Water Hot
AlkaSeltzer in Film Canister
N/A
Denture Cleaner in Film Canister
N/A
3rd Block Data Table (B-day)Independent
VariableWhat is Affecting
the Reaction Rate?
Temperature Time for Reaction to Complete
PowderedAlka Seltzer Tablet
N/A
BrokenAlka Seltzer Tablet
N/A
Whole Alka Seltzer Tablet
N/A
Room Temp Water Room Temp.
Cold Water Cold
Hot Water Hot
Alka Seltzer in Film Canister
N/A
Denture Cleaner in Film Canister
N/A
4th Block Data Table (B-day)Independent Variable
What is Affecting the Reaction
Rate?
Temperature Time for Reaction to Complete
PowderedAlka Seltzer Tablet
N/A
BrokenAlka Seltzer Tablet
N/A
Whole Alka Seltzer Tablet
N/A
Room Temp Water Room Temp.
Cold Water Cold
Hot Water Hot
Alka Seltzer in Film Canister
N/A
Denture Cleaner in Film Canister
N/A
Review your Chemistry Vocabulary List so that you are prepared for the “Starburst Speedword” next class, AND the last test!
Homework:
Update your Table of Contents Write your homework – leave it to be stamped
Get your Review Packet out to be checked!
WARM - UP
Date Session#
Activity Page#
10/18 & 10/21
20 Chemistry Review Packet 33
10/22-10/23
21 Starburst Speed Word 34
Let’s Take a Look At Your Data Table…