Semmelweis entrance Chemistry Exam
2026 Questions and Answers
The mole concept - Answer -A method that allows the relative number of reactant
particles involved in a chemical reaction to be known
Avogadro's number - Answer -number of representative particles in a mole, 6.02 X
10^23
Basic structures of atoms - Answer -There is a nucleus in the center surrounded by
an electron cloud or field
Quantum numbers - Answer -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 - Answer -Water (H2O), table salt (NaCL); carbon dioxide
(CO2); baking soda (NaHCO3); carbon monoxide (CO); sand or glass (SiO2)
Periodic properties - Answer -chemical or physical properties that vary among
elements according to trends that repeat as atomic number increases
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,What are the periodic properties? - Answer -
Element (on periodic table) - Answer -
Atomic number is the same as - Answer -number of protons
Atomic mass is the same as - Answer -Number of protons and neutrons
Different types of chemical bonding - Answer -metallic, covalent, ionic
What is covalent bonding and how does it work? - Answer -when atoms share one
or more pairs of electrons. They have similar electronegativities
What is ionic bonding? - Answer -when atoms transfer electrons. Large difference
in electronegativity
Examples of ionic bonds - Answer -NaCl
Cs2O
MgO
NH4NO3
Examples of covalent bonds - Answer -F2, O2, N2, H2, CL2, HCL, H2O
What is metallic bonding? - Answer -the chemical bonding that results from the
attraction between metal atoms and the surrounding sea of electrons
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, What is hydrogen bonding? - Answer -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? - Answer -The attraction between the positive end of
one polar molecule and the negative end of another
What is a london dispersion force? - Answer -weak forces that result from
temporary shifts in the density of electrons in electron clouds
What is the lewis structure? - Answer -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 - Answer -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 - Answer -bent
Lewis structure of CO2 - Answer -linear
Lewis structure of H2O - Answer -bent
Lewis structure of Methane - Answer -tetrahedral structure
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2026 Questions and Answers
The mole concept - Answer -A method that allows the relative number of reactant
particles involved in a chemical reaction to be known
Avogadro's number - Answer -number of representative particles in a mole, 6.02 X
10^23
Basic structures of atoms - Answer -There is a nucleus in the center surrounded by
an electron cloud or field
Quantum numbers - Answer -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 - Answer -Water (H2O), table salt (NaCL); carbon dioxide
(CO2); baking soda (NaHCO3); carbon monoxide (CO); sand or glass (SiO2)
Periodic properties - Answer -chemical or physical properties that vary among
elements according to trends that repeat as atomic number increases
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,What are the periodic properties? - Answer -
Element (on periodic table) - Answer -
Atomic number is the same as - Answer -number of protons
Atomic mass is the same as - Answer -Number of protons and neutrons
Different types of chemical bonding - Answer -metallic, covalent, ionic
What is covalent bonding and how does it work? - Answer -when atoms share one
or more pairs of electrons. They have similar electronegativities
What is ionic bonding? - Answer -when atoms transfer electrons. Large difference
in electronegativity
Examples of ionic bonds - Answer -NaCl
Cs2O
MgO
NH4NO3
Examples of covalent bonds - Answer -F2, O2, N2, H2, CL2, HCL, H2O
What is metallic bonding? - Answer -the chemical bonding that results from the
attraction between metal atoms and the surrounding sea of electrons
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, What is hydrogen bonding? - Answer -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? - Answer -The attraction between the positive end of
one polar molecule and the negative end of another
What is a london dispersion force? - Answer -weak forces that result from
temporary shifts in the density of electrons in electron clouds
What is the lewis structure? - Answer -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 - Answer -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 - Answer -bent
Lewis structure of CO2 - Answer -linear
Lewis structure of H2O - Answer -bent
Lewis structure of Methane - Answer -tetrahedral structure
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