Vocabulary
This is a reaction that releases energy.
What is exothermic?
This is what happens to particle speed if energy is transferred to those particles.
What is an increase?
This system is the energy source when modeling an exothermic reaction.
What is the reaction system?
This system receives the most energy during an endothermic reaction.
What is the reaction system?
These are the three steps in the engineering design process.
What are define, develop solutions, and optimize?
This is a reaction that absorbs energy.
What is endothermic?
This is what happens to particle speed if energy is transferred from those particles.
What is a decrease?
This system receives the most energy when modeling an exothermic reaction in an MRE.
What is the food system?
Increasing the number of reactants in an endothermic reaction would cause this kind of temperature change.
What is greater decrease?
These are three criteria of our MRE heater design.
What are:
Lightweight
Heats food to 40 - 47oC
Inexpensive (under $11)?
These are requirements and limitations of a design.
What are criteria and constraints?
Energy is being transferred to the reaction system when this type of reaction happens.
What is endothermic?
This receives the least, but still some, energy when modeling an exothermic reaction in an MRE.
What are the surroundings?
This is the energy source when modeling an endothermic reaction.
What are the surroundings?
These are three constraints of our MRE heater design.
What are:
Easily accessible materials (like something you can find at a hardware store)
Small amount of food or reactants in order to reach weight constraint
Reactants must be safe?
This is the capacity to do work.
What is energy?
Energy is being transferred from the reaction system when touching it feels like this temperature.
What is hot?
When an object feels hot when you touch it with your hand, energy is transferring to this.
What is your hand?
When an object feels cold when you touch it with your hand, energy is transferring to this.
What is the object?
In an experiment, the experimenter should change this many variables at once.
What is one?
This is the internal energy of an object based on the vibration of its particles.
What is thermal energy?
When thermometers go up, this must be losing energy.
What are the surroundings?
Energy must go into the thermometer for it to increase, so the energy has to come from the surroundings.
A reaction between these two household items is exothermic.
What are aluminum and copper sulfate?
A reaction between these two household items is endothermic.
What are baking soda and vinegar?
This is the variable(s) that we measure in an experiment.
What is dependent?