Unit 2 MRE

What observations might indicate a chemical reaction is happening inside the MRE heater or hand warmer?

• Formation of a shiny surface

• Increase in size of particles

• Decrease in mass of materials

• Generation of heat and change in temperature

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NGSS.MS-PS1-2

NGSS.MS-PS3-4

NGSS.MS-PS1-4

How does the addition of water to the MRE heater contribute to the heating process? (catalyst)

• It triggers a chemical reaction

• It cools the substances inside

• It forms bubbles of air.

• It makes the ingredients dissolve.

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NGSS.MS-PS1-2

NGSS.MS-PS3-4

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Which substance present in both the hand warmer and MRE heater is described as a colorless crystalline substance?

• Silicon dioxide

• Sodium chloride

• Magnesium

• Iron powder

How do chemical reactions in the MRE heater and the hand warmer differ?

• Both use water to produce heat and have identical reactions.

• The MRE heater and hand warmer work using identical ingredients and methods.

• The MRE heater uses a reaction with water to produce heat, while the hand warmer uses air exposure.

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NGSS.MS-PS3-4

NGSS.MS-PS3-3

What should you do first when creating your flameless heater design?

• Consider the criteria and constraints of the project.

• Buy the most expensive materials available.

• Make it look flashy and colorful.

• Ensure it is built in the fastest possible time

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NGSS.MS-ETS1-1

 Why is it important to develop an initial model for the flameless heater?

• To impress the teacher

• To make it look complex

• To visualize and explain how the heater will function

• To compare it with other gadgets

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NGSS.MS-ETS1-1

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What did you notice about how an MRE heater activates

• Its catalyst is water.

• 1. It needed an open flame to work.

• It requires electricity.

• 1. It must be heated on a stove.

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NGSS.MS-PS3-4

NGSS.MS-PS1-4

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What is one potential hazard of magnesium powder in the MRE heater?

• 1. It corrodes the container it’s stored in.

• 1. It produces harmful radiation upon heating.

• 1. It can cause severe allergic reactions upon contact.

• 1. It is highly flammable, especially in powdered form.

What is the first action we did as "Engineers?".

• Research

• Proposed a Solution

• Listed Criteria and Constraints

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NGSS.MS-ETS1-1

How are the Bath Bomb and the Flameless Heater considered RELATED Phenomena.

• Both were studied in science.

• Both use water and are physical reactions.

• Both are chemical reactions where atoms rearrange.

• Both ONLY experienced a phase change.

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NGSS.MS-PS1-2

NGSS.MS-PS1-4