SEMMELWEIS ENTRANCE EXAM
CHEMISTRY QUESTIONS AND
ANSWERS GRADED A+ 2025/2026
The mole concept - ANS A method that allows the relative number of reactant particles
involved in a chemical reaction to be known
Avogadro's number - ANS number of representative particles in a mole, 6.02 X 10^23
Basic structures of atoms - ANS There is a nucleus in the center surrounded by an electron
cloud or field
Quantum numbers - ANS 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 - ANS Water (H2O), table salt (NaCL); carbon dioxide (CO2); baking
soda (NaHCO3); carbon monoxide (CO); sand or glass (SiO2)
Periodic properties - ANS 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? - ANS
Element (on periodic table) - ANS
Atomic number is the same as - ANS number of protons
Atomic mass is the same as - ANS Number of protons and neutrons
Different types of chemical bonding - ANS metallic, covalent, ionic
What is covalent bonding and how does it work? - ANS when atoms share one or more pairs
of electrons. They have similar electronegativities
What is ionic bonding? - ANS when atoms transfer electrons. Large difference in
electronegativity
Examples of ionic bonds - ANS NaCl
Cs2O
MgO
NH4NO3
Examples of covalent bonds - ANS F2, O2, N2, H2, CL2, HCL, H2O
What is metallic bonding? - ANS the chemical bonding that results from the attraction
between metal atoms and the surrounding sea of electrons
2 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
CHEMISTRY QUESTIONS AND
ANSWERS GRADED A+ 2025/2026
The mole concept - ANS A method that allows the relative number of reactant particles
involved in a chemical reaction to be known
Avogadro's number - ANS number of representative particles in a mole, 6.02 X 10^23
Basic structures of atoms - ANS There is a nucleus in the center surrounded by an electron
cloud or field
Quantum numbers - ANS 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 - ANS Water (H2O), table salt (NaCL); carbon dioxide (CO2); baking
soda (NaHCO3); carbon monoxide (CO); sand or glass (SiO2)
Periodic properties - ANS chemical or physical properties that vary among elements
according to trends that repeat as atomic number increases
1 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
, What are the periodic properties? - ANS
Element (on periodic table) - ANS
Atomic number is the same as - ANS number of protons
Atomic mass is the same as - ANS Number of protons and neutrons
Different types of chemical bonding - ANS metallic, covalent, ionic
What is covalent bonding and how does it work? - ANS when atoms share one or more pairs
of electrons. They have similar electronegativities
What is ionic bonding? - ANS when atoms transfer electrons. Large difference in
electronegativity
Examples of ionic bonds - ANS NaCl
Cs2O
MgO
NH4NO3
Examples of covalent bonds - ANS F2, O2, N2, H2, CL2, HCL, H2O
What is metallic bonding? - ANS the chemical bonding that results from the attraction
between metal atoms and the surrounding sea of electrons
2 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
