Polarity_GIZMO_Lab.docx

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? The 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 will likely stay in the middle, as the applied forces are equal. 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? The chlorine atom seemed to absorb the charge from the sodium atom, becoming larger than the Na atom while the Na shrunk. 2. Which atom seems to be pulling more on the sodium’s one valence electron? The Cl atom. How do you know? The Cl atom’s charge grew in strength, while the Na atom’s charge lessened. 3. What happens to the colors of the simulated atoms, and what does this indicate? The chlorine atom turned red while the sodium atom turned blue, which indicates that the red is a negative charge, and the blue is a positive charge. 2019 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.