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Semmelweis entrance exam (N) questions and answers
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Semmelweis entrance exam (N) questions and answers
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Semmelweis entrance exam (N)questions and answers
The mole concept - Correct Answers -A method that allows the relative number of
reactant particles involved in a chemical reaction to be known
Avogadro's number - Correct Answers -number of representative particles in a mole,
6.02 X 10^23
Basic structures of atoms - Correct Answers -There is a nucleus in the center
surrounded by an electron cloud or field
Quantum numbers - Correct Answers -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 - Correct Answers -Water (H2O), table salt (NaCL); carbon
dioxide (CO2); baking soda (NaHCO3); carbon monoxide (CO); sand or glass (SiO2)
Periodic properties - Correct Answers -chemical or physical properties that vary among
elements according to trends that repeat as atomic number increases
What are the periodic properties? - Correct Answers -
Element (on periodic table) - Correct Answers -
Atomic number is the same as - Correct Answers -number of protons
Atomic mass is the same as - Correct Answers -Number of protons and neutrons
Different types of chemical bonding - Correct Answers -metallic, covalent, ionic
What is covalent bonding and how does it work? - Correct Answers -when atoms share
one or more pairs of electrons. They have similar electronegativities
, What is ionic bonding? - Correct Answers -when atoms transfer electrons. Large
difference in electronegativity
Examples of ionic bonds - Correct Answers -NaCl
Cs2O
MgO
NH4NO3
Examples of covalent bonds - Correct Answers -F2, O2, N2, H2, CL2, HCL, H2O
What is metallic bonding? - Correct Answers -the chemical bonding that results from the
attraction between metal atoms and the surrounding sea of electrons
What is hydrogen bonding? - Correct Answers -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? - Correct Answers -The attraction between the positive
end of one polar molecule and the negative end of another
What is a london dispersion force? - Correct Answers -weak forces that result from
temporary shifts in the density of electrons in electron clouds
What is the lewis structure? - Correct Answers -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 - Correct Answers -The number of atomic orbitals used to
create a set of hybrid orbitals equals the number of orbitals generated by hybridization.
Lewis structure of Ozone - Correct Answers -bent
Lewis structure of CO2 - Correct Answers -linear
Lewis structure of H2O - Correct Answers -bent
Lewis structure of Methane - Correct Answers -tetrahedral structure
Lewis structure of ammonia - Correct Answers -trigonal pyramidal
Lewis structure Ethene - Correct Answers -
Lewis structure Ethane - Correct Answers -
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