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PHYSICAL OR CHEMICAL CHANGE?

PHYSICAL OR CHEMICAL CHANGE?. Aluminum foil is cut in half. Milk goes sour. Clay is molded into a new shape. Jewelry tarnishes. Water evaporates from the surface of the ocean. Rust forms on a nail left outside. Rubbing alcohol evaporates on your hand. Hydrogen peroxide bubbles in a cut

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PHYSICAL OR CHEMICAL CHANGE?

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  1. PHYSICAL OR CHEMICAL CHANGE? • Aluminum foil is cut in half. • Milk goes sour. • Clay is molded into a new shape. • Jewelry tarnishes. • Water evaporates from the surface of the ocean. • Rust forms on a nail left outside. • Rubbing alcohol evaporates on your hand. • Hydrogen peroxide bubbles in a cut • Your body digests food.

  2. Relative Age of Ms. T’s lunch • Read the following story carefully. Then determine the correct order for the sentences. Be aware that the order has been mixed up! • I got out bread, peanut butter, and jelly. • I ate the sandwich. • I put the two pieces of bread together. • I spread a layer of jelly on another piece of bread. • I was hungry. • I spread a layer of peanut butter on a piece bread.

  3. Are You Reactive • Take notes…even if you’re not the recorder! • Some of the solutions are corrosive (cause severe burns) • Goggles on at all times • DO NOT CROSS CONTAMINATE YOUR SAMPLES (Do not use the pipettes to stir) • Dry temperature probes, stirring rods between reactions

  4. Experiment 1: Mg and compounds • What do we know about Mg? Metal or Nonmetal? • How many valence electrons? • What group is it in? How reactive is it likely to be? • Recording initial and final temperature

  5. Experiment 2: Dissolving Ammonium Chloride in solutions • What type of reaction is this likely to be? • Recording initial and final temperature

  6. Experiment 3: Reacting 2 solutions together • What type of reaction is this likely to be? • Record initial and final temperature • As temperature changes how is energy flowing to the thermometer? • If energy is release to the surroundings will you see an increase or decrease in temperature? • If the reaction needs energy from the surroundings will you see an increase or decrease in temperature?

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