1. Electrical Charge and Interactions of Matter Notes Electrical Charge Definition Definition A property of (-) and (+) NOT a substance Like gravity, we don’t really know what charge is or how it “works”

2. Electrical Charge and Interactions of Matter Notes Conservation of Electrical Charge Nature of Electrical Charge Electrical charge is neither created nor destroyed in any chemical or physical reaction (just like energy and matter) Like charges ________ Opposite charges _______ Charged matter (+ or -) will attract neutral matter

3. Electrical Charge and Interactions of Matter Notes How Does a Charged Particle Attract a Neutral Particle? Polarization Polarization Movement of negatives in a neutral object as a result of being brought into close proximity with a charged object Conductors and Insulators

4. Electrical Charge and Interactions of Matter Notes Conductors Picture (+ and neutral) Picture (- and neutral) Matter in which negatives are not attached to any specific atom Sea of negatives that moves easily to one side or other of the object Characteristic of metals

5. Electrical Charge and Interactions of Matter Notes Insulators Picture (+ and neutral) Picture (- and neutral) Matter in which negatives are attached to a specific atom Negatives spend more time on one side of their atom than the other

6. Electrical Charge and Interactions of Matter Notes When a charged object is brought into close proximity with a neutral object will a conductor or insulator show the greatest attraction? (think about how electrons move in conductors and insulators) When a charged object is brought into close proximity with a neutral object will a conductor or insulator show the greatest attraction? (think about how electrons move in conductors and insulators) Was the Al foil in sticky tape a conductor or an insulator? Was the Al foil in sticky tape a conductor or an insulator? Was the paper in sticky tape a conductor or an insulator? Was the paper in sticky tape a conductor or an insulator? Does a neutral object have no charges? (Does a neutral atom have no charges?) Does a neutral object have no charges? (Does a neutral atom have no charges?)