SEMMELWEIS ENTRANCE EXAM CHEMISTRY-ACTUAL EXAM-LATEST
UPDATE 2025 | COMPLETE QUESTIONS WITH CORRECT DETAILED AND
VERIFIED ANSWERS|MOSTLY TESTED QUESTIONS- RATED 100% CORRECT!!
GUARANTEED PASS!! ALREADY GRADED A+
What are the 4 main elements of living organisms?: carbon, nitrogen, oxygen, hydrogen
What are atomic orbitals?: regions where there is a high probability of finding an electron
What are the first few electron configurations?: 1s 2s, 2p
3s, 3p, 3d
4s, 4p, 4d, 4f
What are primary chemical bonds?: ionic, covalent, metallic
What are secondary chemical bonds?: 1. Hydrogen bonds
2. Van der Waals bonds
What are hydrogen bonds?: Bonds between hydrogen atom and atoms of the most
electronegative elements (N, O, F)
What are Van der Waal's bonds?: 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: • 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?: Hydrogen bonds, dipole-induced dipole forces, and
London dispersion forces
Ionization of water: 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?: mass concentration, molar concentration, number
concentration, and volume concentration.
What is the definition of pH?: measure of hydrogen ion concentration of a solution to determine
acidity/basic
What is the formula for pH?: pH = -log[H+]
What is chemical equilibrium?: the rate of the forward reaction is equal to the rate of the reverse
reaction
What is le chatelier's principal?: If a stress occurs in a reaction, the equilibrium will shift to
counter the stress
What is an exothermic reaction?: a reaction that transfers energy to its surroundings (solution
becomes colder)
, What is an endothermic reaction?: A reaction that ABSORBS energy in the form of heat
(solution becomes hotter)
What is the conservation of energy?: Energy cannot be created or destroyed, only transferred
What is enthalpy?: total heat content of a system (H)
What is entropy?: A measure of disorder or randomness (S)
What is the driving force of natural processes?: enthalpy H and entropy S
What is the order of entropy and the state of matter?: solid < liquid < gas 23. What is reaction
rate?: The reaction rate is the speed at which a chemical reaction takes place
24. What factors affect reaction rate?: Reactant concentration, the physical state of the reactants,
and surface area, temperature, and the presence of a catalyst 25. What is the activation energy of
a reaction?: The minimum energy that particles must have to react
What is catalysis?: An increase in the rate of a chemical reaction using a catalyst (such as an
enzyme)
The catalyst lowers the activation energy of the reaction
What is a hydrocarbon?: a compound made of hydrogen and carbon atoms
What is the difference between saturated and unsaturated hydrocarbons?: saturated has the
maximum possible amount of hydrogen atoms bonded to the carbon chain (no double bonds)
unsaturated does not (can contain double bonds)
What is the structure of steroids?: all steroids have 4 fused carbon rings
What is the function of steroids?: steroids derive from cholesterol
UPDATE 2025 | COMPLETE QUESTIONS WITH CORRECT DETAILED AND
VERIFIED ANSWERS|MOSTLY TESTED QUESTIONS- RATED 100% CORRECT!!
GUARANTEED PASS!! ALREADY GRADED A+
What are the 4 main elements of living organisms?: carbon, nitrogen, oxygen, hydrogen
What are atomic orbitals?: regions where there is a high probability of finding an electron
What are the first few electron configurations?: 1s 2s, 2p
3s, 3p, 3d
4s, 4p, 4d, 4f
What are primary chemical bonds?: ionic, covalent, metallic
What are secondary chemical bonds?: 1. Hydrogen bonds
2. Van der Waals bonds
What are hydrogen bonds?: Bonds between hydrogen atom and atoms of the most
electronegative elements (N, O, F)
What are Van der Waal's bonds?: 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: • 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?: Hydrogen bonds, dipole-induced dipole forces, and
London dispersion forces
Ionization of water: 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?: mass concentration, molar concentration, number
concentration, and volume concentration.
What is the definition of pH?: measure of hydrogen ion concentration of a solution to determine
acidity/basic
What is the formula for pH?: pH = -log[H+]
What is chemical equilibrium?: the rate of the forward reaction is equal to the rate of the reverse
reaction
What is le chatelier's principal?: If a stress occurs in a reaction, the equilibrium will shift to
counter the stress
What is an exothermic reaction?: a reaction that transfers energy to its surroundings (solution
becomes colder)
, What is an endothermic reaction?: A reaction that ABSORBS energy in the form of heat
(solution becomes hotter)
What is the conservation of energy?: Energy cannot be created or destroyed, only transferred
What is enthalpy?: total heat content of a system (H)
What is entropy?: A measure of disorder or randomness (S)
What is the driving force of natural processes?: enthalpy H and entropy S
What is the order of entropy and the state of matter?: solid < liquid < gas 23. What is reaction
rate?: The reaction rate is the speed at which a chemical reaction takes place
24. What factors affect reaction rate?: Reactant concentration, the physical state of the reactants,
and surface area, temperature, and the presence of a catalyst 25. What is the activation energy of
a reaction?: The minimum energy that particles must have to react
What is catalysis?: An increase in the rate of a chemical reaction using a catalyst (such as an
enzyme)
The catalyst lowers the activation energy of the reaction
What is a hydrocarbon?: a compound made of hydrogen and carbon atoms
What is the difference between saturated and unsaturated hydrocarbons?: saturated has the
maximum possible amount of hydrogen atoms bonded to the carbon chain (no double bonds)
unsaturated does not (can contain double bonds)
What is the structure of steroids?: all steroids have 4 fused carbon rings
What is the function of steroids?: steroids derive from cholesterol
