By Sharon Wynne
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Extra info for CSET Chemistry 121, 125 Teacher Certification Test Prep Study Guide, 2nd Edition (XAM CSET)
Examples: Which of the following are polar molecules: CO2, CH2Cl2, CCl4. 1c). htm. The following intermolecular forces between molecules are usually weaker than covalent, ionic, and metallic bonds. They are listed from the strongest force to the weakest. Ion-dipole interactions Salts tend to dissolve in several polar solvents. An ion with a full charge in a polar solvent will orient nearby solvent molecules so that their opposite partial charges are pointing towards the ion. In aqueous solution, certain salts react to form solid precipitates if a combination of their ions is insoluble.
The stronger intermolecular bond) will have the following properties relative to the other substance: For solids: Higher melting point Higher enthalpy of fusion Greater hardness Lower vapor pressure For liquids: Higher boiling point Higher critical temperature Higher critical pressure Higher enthalpy of vaporization Higher viscosity Higher surface tension Lower vapor pressure For gases: Intermolecular attractive forces are neglected for ideal gases. For example, covalent networks, salts, and metals are nearly always solids at room temperature because the strength of these bonds results in a high melting point.
Rutherford's model of the atom was an analogy to the sun and the planets. A small positively charged nucleus is surrounded by circling electrons and mostly by empty space. swf. CHEMISTRY 12 TEACHER CERTIFICATION EXAM De Broglie Depending on the experiment, radiation appears to have wave-like or particle-like traits. In 1923-1924, Louis de Broglie applied this wave/particle duality to all matter with momentum. The discrete distances from the nucleus described by Bohr corresponded to permissible distances where standing waves could exist.