Experiments
We tested several reactant combinations, including steel wool and vinegar, baking soda and vinegar, and root killer and aluminum foil. This reactant combination released the most energy.
What is root killer and aluminum foil?
This was our constraint for the weight of the whole MRE.
What is 700 grams?
This system was our energy source when modeling energy transfer.
What is the reaction system?
These are the three steps in the engineering design process.
This is a reaction that releases heat.
What is an exothermic reaction?
This safety rule was in place because the reaction between root killer and aluminum foil released hydrogen (H2) gas.
What is venting our reaction system?
This was our constraint for the cost of the overall MRE.
What is $11?
This system received the most energy when modeling energy transfer.
What is the food system?
This is the part of the engineering design process where we research and explore possible solutions.
What is develop solutions?
This is a reaction that absorbs heat.
What is an endothermic reaction?
We tested several different proportions of aluminum and root killer. This proportion of reactants released the most energy.
What is 92% root killer and 8% aluminum?
OR
What is 5.5 grams root killer and 0.5 grams aluminum?
This was our constraint for the cost of just the MRE heater.
What is $3.50?
This received the least amount of energy when we modeled energy transfer.
What is the surroundings?
These are individuals or entities that are impacted by our design decisions.
What are stakeholders?
This is a reaction that heats its surroundings.
What is an exothermic reaction?
These are the two qualities that determined the best proportion of reactants.
What are: 1. released the most heat, 2. had the fewest reactants left over?
This was our criteria for the temperature range that the heater should get the food to.
This system had the fastest particles when we modeled energy transfer.
What is the food system?
This is the part of the engineering design process where we specify criteria and constraints that a possible solution to a simple problem must meet.
What is define?
This is a reaction that cools its surroundings.
What is an endothermic reaction?
We tested several reactant combinations, including steel wool and vinegar, baking soda and vinegar, and root killer and aluminum foil. This reactant combination absorbed the most energy.
What is baking soda and vinegar?
These are the definitions of criteria and constraints.
What are:
The things our design must do to be successful?
The features that limit a design?
This is gaining energy when a thermometer shows an increase in temperature.
What are the surroundings?
OR
What is the thermometer?
This is the part of the engineering design process where we improve a solution based on the result of tests.
What is optimize?
More reactants causes more energy transfer because there are more of these to rearrange.
What are particles/atoms?