Semmelweis Entrance Exam Chemistry
Newest Version (2026) Actual Questions
and Answers 100% Correct (A+
‣ The mole concept -✓✓A method that allows the relative number of reactant
particles involved in a chemical reaction to be known
‣ Avogadro's number -✓✓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
, ‣ What is ionic bonding? -✓✓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.
‣ Lewis structure of Ozone -✓✓bent
‣ Lewis structure of CO2 -✓✓linear
‣ Lewis structure of H2O -✓✓bent
Newest Version (2026) Actual Questions
and Answers 100% Correct (A+
‣ The mole concept -✓✓A method that allows the relative number of reactant
particles involved in a chemical reaction to be known
‣ Avogadro's number -✓✓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
, ‣ What is ionic bonding? -✓✓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.
‣ Lewis structure of Ozone -✓✓bent
‣ Lewis structure of CO2 -✓✓linear
‣ Lewis structure of H2O -✓✓bent
