SEMMELWEIS ENTRANCE EXAM
CHEMISTRY QUESTIONS AND
ANSWERS GRADED A+ 2025/2026
What are the 4 main elements of living organisms? - ANS carbon, nitrogen, oxygen, hydrogen
What are atomic orbitals? - ANS regions where there is a high probability of finding an
electron
What are the first few electron configurations? - ANS 1s
2s, 2p
3s, 3p, 3d
4s, 4p, 4d, 4f
What are primary chemical bonds? - ANS ionic, covalent, metallic
What are secondary chemical bonds? - ANS 1. Hydrogen bonds
2. Van der Waals bonds
What are hydrogen bonds? - ANS Bonds between hydrogen atom and atoms of the most
electronegative elements (N, O, F)
1 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
, What are Van der Waal's bonds? - ANS The first type is a result of electrostatic attraction
between two permanent dipoles
The second type of Van der Waal's bond is formed due to temporary dipoles
Properties of water - ANS • strong hydrogen bonds
• high heat capacity
• solvent
• needs a lot of energy to evaporate
• expands when freezes
• cohesion (sticks to itself)
• adhesion (sticks to other things)
What are the intermolecular forces in water? - ANS Hydrogen bonds, dipole-induced dipole
forces, and London dispersion forces
Ionization of water - ANS the transfer of a proton from one water molecule to another to
produce a hydroxide ion and a hydronium ion
What are the types of concentrations? - ANS mass concentration, molar concentration,
number concentration, and volume concentration.
What is the definition of pH? - ANS measure of hydrogen ion concentration of a solution to
determine acidity/basic
What is the formula for pH? - ANS pH = -log[H+]
2 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
CHEMISTRY QUESTIONS AND
ANSWERS GRADED A+ 2025/2026
What are the 4 main elements of living organisms? - ANS carbon, nitrogen, oxygen, hydrogen
What are atomic orbitals? - ANS regions where there is a high probability of finding an
electron
What are the first few electron configurations? - ANS 1s
2s, 2p
3s, 3p, 3d
4s, 4p, 4d, 4f
What are primary chemical bonds? - ANS ionic, covalent, metallic
What are secondary chemical bonds? - ANS 1. Hydrogen bonds
2. Van der Waals bonds
What are hydrogen bonds? - ANS Bonds between hydrogen atom and atoms of the most
electronegative elements (N, O, F)
1 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
, What are Van der Waal's bonds? - ANS The first type is a result of electrostatic attraction
between two permanent dipoles
The second type of Van der Waal's bond is formed due to temporary dipoles
Properties of water - ANS • strong hydrogen bonds
• high heat capacity
• solvent
• needs a lot of energy to evaporate
• expands when freezes
• cohesion (sticks to itself)
• adhesion (sticks to other things)
What are the intermolecular forces in water? - ANS Hydrogen bonds, dipole-induced dipole
forces, and London dispersion forces
Ionization of water - ANS the transfer of a proton from one water molecule to another to
produce a hydroxide ion and a hydronium ion
What are the types of concentrations? - ANS mass concentration, molar concentration,
number concentration, and volume concentration.
What is the definition of pH? - ANS measure of hydrogen ion concentration of a solution to
determine acidity/basic
What is the formula for pH? - ANS pH = -log[H+]
2 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
