PHYSICAL OR CHEMICAL CHANGE Aluminum foil is cut

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.

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.

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

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

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

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 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?