Semmelweis Entrance Exam (N) Questions with Verified Answers 2024/2025

Semmelweis Entrance Exam (N) Questions with Verified Answers 2024/2025 The mole concept Correct Answer: A method that allows the relative number of reactant particles involved in a chemical reaction to be known Avogadro's number Correct Answer: number of representative particles in a mole, 6.02 X 10^23 Basic structures of atoms Correct Answer: There is a nucleus in the center surrounded by an electron cloud or field Quantum numbers Correct 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 Correct Answer: Water (H2O), table salt (NaCL); carbon dioxide (CO2); baking soda (NaHCO3); carbon monoxide (CO); sand or glass (SiO2) Periodic properties Correct Answer: chemical or physical properties that vary among elements according to trends that repeat as atomic number increases What are the periodic properties? Correct Answer: Element (on periodic table) Correct Answer: Atomic number is the same as Correct Answer: number of protons Atomic mass is the same as Correct Answer: Number of protons and neutrons Different types of chemical bonding Correct Answer: metallic, covalent, ionic What is covalent bonding and how does it work? Correct Answer: when atoms share one or more pairs of electrons. They have similar electronegativities What is ionic bonding? Correct Answer: when atoms transfer electrons. Large difference in electronegativity Examples of ionic bonds Correct Answer: NaCl Cs2O MgO NH4NO3