2019Name:Paulo Date: 13-3-2020 Student Exploration: Polarity and Intermolecular Forces Vocabulary: dipole, dipole-dipole force, dipole-induced dipole force, electronegativity, intermolecular force, ionic bond, London dispersion force, molecule, nonpolar, nonpolar covalent
bond, partial charges, polar, polar covalent bond, valence electron
Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1.A big bully is having a tug-of-war with a small child. There is a ball attached to the middle of the rope. Toward whom will the ball move? A big bully 2.Two equally strong kids are having a tug-of-war. What do you expect to happen to the ball in
this situation? The ball don’ Gizmo Warm-up
Just like in a tug-of-war, atoms that are bonded to one another pull on the electrons they share. In the Polarity and Intermolecular Forces Gizmo, you will explore how these opposing forces relate to bond types and the forces between molecules.
To begin, drag the Na (sodium) and Cl (chlorine) atoms into the simulation area. Turn on Show valence electrons . A valence electron is found in the outermost energy level of the atom.
1.Click Play (
). What do you notice? 2.Which atom seems to be pulling more on the sodium’s one valence electron? How do you know? 3.What happens to the colors of the simulated atoms, and what does this indicate? This study source was downloaded by 100000816649994 from CourseHero.com on 04-15-2021 03:55:44 GMT -05:00
https://www.coursehero.com/file/57473844/IntermolecularForcesSEdocx/This study resource was
shared via CourseHero.com 2019 Activity A: Bond polarityGet the Gizmo ready : On the BOND POLARITY tab, click Reset (
). Drag the atoms out of the simulation area.
Introduction: A neutral atom has the same number of protons as electrons. Atoms that gain electrons become negatively charged, while those that lose electrons become positive. A polar bond forms when shared electrons are pulled closer to one atom than another, causing the bonded atoms to become partially charged. In a nonpolar bond, electrons are shared equally.
Question: What causes bonds to be polar or nonpolar?
1.Observe : Select the Show polar molecule inset checkbox. The animation shows the probable location of electrons (orange dots) in a polar molecule.
A.What do you notice about the distribution of the electrons? B.How does this electron distribution affect the charges of the bonded atoms? 2.Observe : Turn on the Show nonpolar molecule inset . A.How are the electrons in this molecule distributed? B.Why do the bonded atoms remain neutral? This study source was downloaded by 100000816649994 from CourseHero.com on 04-15-2021 03:55:44 GMT -05:00
https://www.coursehero.com/file/57473844/IntermolecularForcesSEdocx/This study resource was
shared via CourseHero.com
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