Experiment # 1: Ionic Bonding
Materials Needed:
2 inflated balloons
thread
string
piece of material (nylon, wool, or fur)
nylon stocking
piece of white paper
Instructions:
* Tie the ends of the thread to the knotted ends of the balloons, and tie the middle of the thread to the middle of the string.
* Rub the balloons with a piece of material, and then pick them up by holding the ends of the string and stretching it to its full length.
Q: What happens to the balloons when they are close together?
Explanation: The material used to rub the balloons transferred electrons to the balloons.
Q: What electrical charge does the balloon have now?
* Cut 2 3X12 inch strips of material from the nylon stocking.
* Place both strips on a piece of white paper and rub them briskly in your hand.
* With your fingers lift the 2pcs of nylon and hold them side-by-side.
Q: What happened? Why?
* Now bring one of the nylon strips near one of the balloons.
Q: What happened?
What we learned:
* atoms with the same charge, repel
* atoms with opposite charge, attract/stick together = Ionic bond
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