UWorld MCAT QBank Questions Missed Exam Questions And Answers

UWorld MCAT QBank Questions Missed Exam Questions And Answers Paramagnetic - answerUnpaired electrons in the electronic configuration of an atom or ion, which end up interacting with each other in a magnetic field Diamagnetic - answerPaired electrons in the electronic configuration of an atom or ion, which will NOT interact with each other in a magnetic field Electron capture - answerAn alternative form of positron emission (B^+ decay) Reactivity of forming Ionic Bonds - answerThis increases as the Ionization Energy (IE) decreases Ionization energy - answerThe energy required to remove an electron from an atom or ion (measured in the gas state). Higher energy - answerIonizations involving core electrons are [ ] than ionizations involving valence electrons Law of conservation of mass - answerAtoms are NEITHER created or destroyed; Multistep reactions that go to completion must consume all intermediates produced before or during the final step. Ionic bond character - answerThe difference in electronegativity between two bonded atoms is directly proportional to (and indicative of) the degree of [ ] of the bond between the atoms. This increases as the difference in electronegativity between 2 atoms increases. 5 Broad Types of Chemical Reactions - answer- Composition - Decomposition - Single replacement - Double replacement - Combustion Ion-ion interactions - answerThe strongest of the intramolecular interactions; Can be described as having less bond energy than a lattice formed by atomic ions, but it is stronger than a dipole-dipole interaction. The molecules are oriented such that the positively charged group is electrostatically attracted to the negatively charged molecule. Ion-ion interactions between two species Hydrogen bonding - answerA special type of noncovalent dipole-dipole interaction involving species with partial charge; A special kind of noncovalent dipole-dipole interaction between dipoles formed when hydrogen is covalently bound to the highly electronegative elements nitrogen, oxygen, or fluorine. London dispersion forces - answerThe weakest of the noncovalent van der Waals forces; These interactions occur between two atoms or molecules that are near enough to each other for distortions in the electron cloud to induce weak instantaneous dipoles. Tend to be more pronounced in larger molecules with a larger, more polarizable electron cloud. Dipole-Dipole interactions - answerA type of noncovalent interaction that occurs between neighboring polar molecules with polar bonds and a net dipole moment. ; The partial charges align in such a way that the partial negative charges orient toward partial positive charges Van der Waals forces - answerThe larger the electron cloud, the more polarizable the molecule.