Embedded Files
Unit Question:
Unit Question:
How Can We Use Chemical Reactions to Design a Solution to a Problem?
How Can We Use Chemical Reactions to Design a Solution to a Problem?
RESOURCES FOR THE ENTIRE UNIT
RESOURCES FOR THE ENTIRE UNIT
LESSON 1
LESSON 1
How Can We Heat Food When We Don't Have Our Typical Methods Available?
How Can We Heat Food When We Don't Have Our Typical Methods Available?
CLASS CONSENSUS MODELS
BLOCK B2 MODEL
BLOCK B3 MODEL
BLOCK B4 MODEL
BLOCK A1 MODEL
BLOCK A3 MODEL
ACTING AS ENGINEERS
We identified a Problem:
We identified a Problem:
It is hard for people to get hot food when they do not have access to the usual ways they heat food. Pre-packaged MRE's are:
It is hard for people to get hot food when they do not have access to the usual ways they heat food. Pre-packaged MRE's are:
Expensive
Expensive
It could be Confusing to Use
It could be Confusing to Use
Include Limited Food Choices
Include Limited Food Choices
It can Be Hard to Get to People Who Need Them
It can Be Hard to Get to People Who Need Them
We Proposed a Design Solution:
We Proposed a Design Solution:
We want to make a homemade flameless heater to help people be prepared to heat food when they don't have their typical cooking method available.
We want to make a homemade flameless heater to help people be prepared to heat food when they don't have their typical cooking method available.
We Identified Criteria and Constraints
We Identified Criteria and Constraints
CRITERIA for our flameless heater:
CRITERIA for our flameless heater:
Effective (Gets the food hot enough to taste good but not too hot to burn)
Effective (Gets the food hot enough to taste good but not too hot to burn)
Easy to Use (Clear Directions)
Easy to Use (Clear Directions)
CONSTRAINTS for our flameless heater:
CONSTRAINTS for our flameless heater:
Cost Effective (Lower Cost than the pre-packaged MRE)
Cost Effective (Lower Cost than the pre-packaged MRE)
Available where and when people need them
Available where and when people need them
LESSON 2
LESSON 2
How Do Heaters Get Warm Without a Flame?
How Do Heaters Get Warm Without a Flame?
LESSON 2 INVESTIGATION DATA
ACTING AS ENGINEERS
We Researched Existing Solutions:
We Researched Existing Solutions:
We examined the MRE's you can purchase and hand warmers. We activated them in a calorimeter to test their abilities to produce heat.
We examined the MRE's you can purchase and hand warmers. We activated them in a calorimeter to test their abilities to produce heat.
We ruled out both as good alternatives for the Homemade Flameless Heater.
We ruled out both as good alternatives for the Homemade Flameless Heater.
The current MRE model is too expensive and the Hand Warmers do not produce enough heat to warm food quickly.
The current MRE model is too expensive and the Hand Warmers do not produce enough heat to warm food quickly.
LESSON 3
LESSON 3
What Other Chemical Reactions Could We Use to Heat Up Food?
What Other Chemical Reactions Could We Use to Heat Up Food?
LESSON 3 INVESTIGATION DATA
GUIDED NOTES:
PARTICLE-LEVEL MODEL OF THE CHOSEN CHEMICAL REACTION
ENERGY TRANSFER DIAGRAM FOR OUR REACTION SYSTEM
ACTING AS ENGINEERS
We systematically tested parts of our design solution:
We systematically tested parts of our design solution:
We divided tasks among our classmates and tested several different reactions. This helped to reduce time and save resources.
We figured out we will use root killer and aluminum foil in saltwater in our homemade flameless heaters.
This reaction worked best because it caused the greatest temperature increase compared to the other reactions we tried, and the ingredients are easy to obtain
We developed and used models to predict/explain what we could not see.
We developed and used models to predict/explain what we could not see.
LESSON 4
LESSON 4
How Much of Each Reactant Should We Include in Our Homemade Flameless Heater?
How Much of Each Reactant Should We Include in Our Homemade Flameless Heater?
LESSON 4 INVESTIGATION DATA
TABLES 1 AND 2
5.9 grams of Copper Sulfate and
0.1 gram of Aluminum
Temperature Change of about 3° C
TABLES 3 AND 4
5.5 grams of Copper Sulfate and
0.5 gram of Aluminum
Temperature Change of about 29.1° C
TABLES 5 AND 6
1.5 grams of Copper Sulfate and
4..5 grams of Aluminum
Temperature Change of about 10.1° C
ACTING AS ENGINEERS
We systematically tested parts of our design solution:
The best combination of reactants is 8% Al and 92% CuSO4.
We identified stakeholders:
Our stakeholders are:
a person buying supplies and making the heaters,
a person eating the food heated up by the heater,
the environment, and
nonusers who might be affected by use or disposal
OPEN WORKBOOK AND NOTES "THING"
OPEN WORKBOOK AND NOTES "THING"
Lessons 1-3
B-Day Classes on Tuesday, November 25th
A-Day Classes on Wednesday, November 26th
LESSON 5
LESSON 5
How Can We Refine Our Criteria and Constraints?
How Can We Refine Our Criteria and Constraints?
ACTING AS ENGINEERS
We refined what our solution needs to do:
We refined what our solution needs to do:
Our optimal solution needs to:
Cost no more than $12.00 ($3.00 for the heater),
Have a total mass of less than 700grams,
Heat food to 40-47°C.
LESSONS 6-9
LESSONS 6-9
How Can We Design and Redesign our Homemade Flameless Heater?
How Can We Design and Redesign our Homemade Flameless Heater?
Design Teams will PLAN, MODEL, BUILD, and TEST their own Homemade Flameless Heaters.
As a class, we will present data about our first Prototypes and determine the "Best" Qualities of a Flameless Heater.
Design Teams will then redesign their Prototypes and retest their designs to collect data.
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