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Chemistry > Lab Experiment > Lab Report > Lab 9_The Hand Warmer Design Challenge: Where Does the Heat Come From? Use chemistry to design an effective, safe, environmentally benign, and inexpensive hand warmer. The ideal hand warmer increases in temperature by 20°C (but no more) as quickly as possible, has a volume of about 50 mL, costs as little as possible to make, and uses chemicals that are as safe and environmentally friendly as possible. Carry out an experiment to determine which substances, in what amounts, to use in order to make a hand warmer that meets these criteria.
Physics > Lab Experiment > PHYS 125L Simulation Lab#5 Friction: Forces and Motion using PhET’s Force and Motion Basics HTML5 Part 2 – Friction. Includes Questions and Answers.
