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Understanding Changes and Laws in Matter

Explore physical and chemical changes in matter through examples like crushing a soda can and wood burning in a fire. Learn about the signs of chemical reactions such as bubbles, color change, and temperature change. Discover the Law of Conservation of Mass/Matter stating matter cannot be created or destroyed, only rearranged. Engage in hands-on labs involving reactions with baking soda, vinegar, and more to deepen your understanding.

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Understanding Changes and Laws in Matter

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  1. Changes and Law p. I. Changes • Physical – changes the appearance but the substance stays the same 1. Crushing a Soda Can 2. Melting Butter 3. Taking the pulp out of o.j. • Chemical – the substance reacts and becomes something new 1. Wood burning in a fire and becomes ash 2. Sugar melts and becomes caramel

  2. Signs of Chemical Reactionsp. 6 • Bubbles 2. Color Change 3. Temperature Change 4. Precipitate – a new, thicker substance 5. Bright Light

  3. Law of Conservation of Mass/Matter • A. Matter/Mass cannot be created or destroyed • B . Atoms are not lost or gained, they are only rearranged. • Zip Lock Lab: • 1. Baking Soda + Vinegar = • Carbon Dioxide + Water + Sodium acetate

  4. Reaction #1 Lab: Bubbles Reaction #2 Lab: ColorChange TemperatureChange Precipitate P/C Lab: ColorChange Bubbles Reaction Rate Lab: Bubbles TemperatureChange Electrolysis of CuSO4Lab ColorChange Bubbles

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