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4 real world examples of chemical changes series#

There are systematic processes for evaluating solutions with respect to how well they meet the criteria and constraints of a problem.

A solution needs to be tested and then modified on the basis of the test results in order to improve it.

Models of all kinds are important for testing solutions.

Some chemical reactions release energy, while others store energy.

This unit expands students’ understanding of energy in chemical reactions in the context of engineering design. Finally, students optimize their designs and have another team test their homemade heater instructions. This iterative design cycle includes peer feedback, consideration of design modification consequences, and analysis of impacts on stakeholders.

4 real world examples of chemical changes series#

In the second lesson set, students develop their design solutions by investigating how much food and reactants they should include in their homemade heater designs and go through a series of iterative testing and redesigning. Students have an opportunity to reflect on the engineering design process, defining stakeholders, and refining the criteria and constraints for the design solution. In the first lesson set, students explore the inside of an MRE flameless heater, then do investigations to collect evidence to support the idea that this heater and another type of flameless heater (a single-use hand warmer) are undergoing chemical reactions as they get warm. In this 21-day unit, students are introduced to the anchoring phenomenon-a flameless heater in a Meal, Ready-to-Eat (MRE) that provides hot food to people by just adding water. 7.2 Chemical Reactions & Energy How can we use chemical reactions to design a solution to a problem? Unit Summary