50ca713fe4b09c557144e016 Spac3cadet 135

Classifying Reactions

Safety Reminder: Wear safety glasses and use ammonia in a well-ventilated area.

Day 1

Materials:

Part I: steel wool tweezers vinegar small jar or drinking glass water small bowl

Part II: hydrogen peroxide small pieces of raw potato (yeast or beef liver may be substituted for the potato) small bowl

Procedures:

Part I: Reaction between iron and oxygen

1. Break off a small piece of steel wool and soak it in vinegar for at least one minute. Use tweezers to push the steel wool around to remove all bubbles.
2. Using the tweezers, lift the steel wool out of the vinegar and shake if gently over a paper towel.
3. Stretch the steel wool out and gently push it into the bottom of a baby jar.
4. Add water to a small bowl until the water is approximately three-quarters of an inch deep.
5. Invert the baby food jar and place it in the bowl of water.
6. At this point no water should be in the baby jar. You have essentially trapped a baby food jar full of air in the water-filled bowl.
7. Allow to stand for 20 minutes and then record your observations.
8. While the mixture is standing, complete Part II of the lab. Be sure to record your observations for Part I after 20 minutes.

Part II: Decomposition of hydrogen peroxide

1. Pour one third of a cup of hydrogen peroxide into a small bowl.
2. Cut up several small pieces of raw potato and place them in the hydrogen peroxide.
3. Record your observations.

Observations:

Part I: Reaction between iron and oxygen

Appearance of steel wool after 20 minutes _____________________________________

Part II: Decomposition of hydrogen peroxide

Appearance of potato and hydrogen peroxide combination ________________________

Day 2

Materials:

Part III: a penny dated after 1983 metal file or coarse sandpaper vinegar (CH3COOH)

Part IV: baking soda (NaHCO3) vinegar (CH3COOH) cup spoon

Procedures:

Part III: Reaction between zinc and acetic acid
1. Use a file or sandpaper to completely remove the