Semmelweis entrance exam (N) Questions And Answers | Updated Solutions | 100% Correct Answers

he mole concept A method that allows the relative number of reactant particles involved in a chemical reaction to be known Choose an answer 1 Quantum numbers 2 Nomenclature alkynes 3 Atomic mass is the same as 4 The mole concept Don't know? 8/8/25, 8:09 AM Semmelweis entrance exam (N) Flashcards | Quizlet number of representative particles in a mole, 6.02 X 10^23 Basic structures of atoms There is a nucleus in the center surrounded by an electron cloud or field Quantum numbers Quantum numbers describe values of conserved quantities in the dynamics of a quantum system. In the case of electrons, the quantum numbers can be defined as "the sets of numerical values which give acceptable solutions to the Schrödinger wave equation for the hydrogen atom" Common compounds Water (H2O), table salt (NaCL); carbon dioxide (CO2); baking soda (NaHCO3); carbon monoxide (CO); sand or glass (SiO2) Periodic properties chemical or physical properties that vary among elements according to trends that repeat as atomic number increases What are the periodic properties? Element (on periodic table) Atomic number is the same as number of protons Atomic mass is the same as Number of protons and neutrons Different types of chemical bonding metallic, covalent, ionic What is covalent bonding and how does it work? when atoms share one or more pairs of electrons. They have similar electronegativities 8/8/25, 8:09 AM Semmelweis entrance exam (N) Flashcards | Quizlet when atoms transfer electrons. Large difference in electronegativity Examples of ionic bonds NaCl Cs2O MgO NH4NO3 Examples of covalent bonds F2, O2, N2, H2, CL2, HCL, H2O What is metallic bonding? the chemical bonding that results from the attraction between metal atoms and the surrounding sea of electrons What is hydrogen bonding? Hydrogen bonding is the strongest intermolecular force. it only happens when hydrogen is covalently bonded to fluorine, nitrogen or oxygen because they're very electronegative and can pull the bonding electrons away from the hydrogen. Substances with hydrogen bonding have higher melting and boiling points because of the extra energy needed to break the hydrogen bonds. What is a dipole-dipole force? The attraction between the positive end of one polar molecule and the negative end of another What is a london dispersion force? weak forces that result from temporary shifts in the density of electrons in electron clouds What is the lewis structure? diagrams that show the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule. Geometry of molecules The number of atomic orbitals used to create a set of hybrid orbitals equals the number of orbitals generated by hybridization