1.7-1.10

# 1.7-1.10 - Potential Energy and Charged Particles Chemicals...

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1 Section 1.7 Potential Energy and Charged Particles Chemicals store potential energy in bonds, intermolecular forces, and within the atom. ht p://www.csmate.colostate.edu/cltw/cohortpages/viney/atomhistory.html As the semester progresses, note how charge contributes to the energy of a substance. ht p://academic.brooklyn.cuny.edu/biology/bio4fv/page/hydroge.htm What happens when particles of the same charge are brought close to one another? D E Lo E Hi E r - - r 1 - - r 2 - - r 3 0 r 2 r 1 r 3 Section 1.7 As the particles get closer, the energy goes up. What happens when particles of opposite charge are brought close to one another? D E Lo E Hi E r + - r 1 + - r 2 + - r 3 r 1 r 2 r 3 0 Section 1.7 As the particles get closer, the energy goes down. Coulomb’s Law of Force F = When the charges of particle 1 and 2 are both positive or both negative the force is ___________________. k q 1 q 2 e r 2 e = dielectric constant (shielding factor: water shields more than air) r = distance in meters q = charges in Coulombs F = Force in Newtons When one particle is positively charged and the other is negatively charged, the force is negative & attractive. positive & repulsive Section 1.7 k = Coulomb’s constant (8.9875x10 9 Nm 2 /C 2) Charles August Coulomb Coulomb’s Law of Force (Either more attractive or more repulsive) Section 1.7 How can the force become stronger? F = k q 1 q 2 r 2 Larger numerator: Larger charge Smaller denominator: Closer distance Less shielding (vacuum shields less than water) The bottom line: stuff sticks good when it has large charge and is close together Coulomb’s Law of ENERGY F =

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## This note was uploaded on 03/30/2010 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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1.7-1.10 - Potential Energy and Charged Particles Chemicals...

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