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Learn about the properties of protons and electrons, charge calculations, and conservation laws in subatomic particles. Practice examples and implications of charge movement are covered.
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What day is it again? • The subatomic particle that has a positive charge is called the ______________? • The subatomic particle that is able to move to create a positive charge is called the _____________ ? • A proton has a charge of ______Coulombs. One proton is (+/-) one fundamental or elementary charge. The # of Coulombs of one elementary charge is located on line __on the front of the Reference Table
Objectives • The fact that charge comes from protons and electrons means that there must only be discrete amounts charge available to charged objects. • Electrons are the only things that move, so even when something is positively charged we talk about an electron deficiency. • Homework – Finish Worksheet/ Short C L • Test/Quiz Next Thursday !
Example #1 • An object has three excess electrons. • What is its “elementary charge”? • What is its charge in coulombs? -3e q = -3e x (1.6 x 10-19 C)/e = -4.8 x 10-19 C
Example #2 • An object has 75 protons and 65 electrons • What is its “elementary charge”? • What is its charge in coulombs? +10 e q = +10e x (1.6 x 10-19 C)/e = +16 x 10-19 C
Law of Conservation of Charge • The total amount of charge in a closed system remains constant – charge is not created or destroyed, it only moves from one object to another • Charge “moves” as a result of ELECTRONmovement ONLY!!!
Example #3 • A metal sphere with two excess electrons touches a neutral metal sphere and then taken away. • What do you predict the charge on each sphere will be after they make contact? • What is the total charge on both spheres after they come in contact? -1e or -1.6 x 10-19 C -2e or -3.2 x 10-19 C The TOTAL CHARGE remains the SAME!!!
