ENTRANCE EXAM SEMMELWEIS

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ENTRANCE EXAM SEMMELWEIS

UPDATED ACTUAL EXAM WITH

CORRECT SOLUTIONS.

Electron configuration for cations - correct answer- Subtract 1 from exponent of highest n-value orbital (ex. remove from 4s before 3d)

Ag+ = [Kr]5s^1 4d^9

Electron configuration for anions - correct answer- Add 1 to closest orbital

Cl- = [Ne]3s^2 3p^6

Atomic orbitals - correct answer- s, p, d, f

Primary vs secondary structures of proteins - correct answer- Primary - AA chain (linked by peptide bonds)

Secondary - stabilized by non-covalent bonds (alpha helices & beta sheets)

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Most bonds in organic compounds are - correct answer- covalent

Properties of water - correct answer- 1. polar

• capable of adhesion and cohesion
• high heat capacity (so it's hard to raise its temp)
• great solvent
• high heat of vaporization (allows humans to cool off via

sweat)

• water is less dense as a solid than a liquid

Intermolecular forces of water - correct answer- hydrogen bonding

Solution components - correct answer- 1. solvent (product being dissolved)

• solute (medium for dissolving solvent)

Molarity - correct answer- the number of moles of solute per liter of solution

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Solubility rules - correct answer- SOLUBLE

• alkali metals (group 1) & NH4+ cations
• NO3- or CH3COO- anions
• Cl, Br, I (except when bonded to Ag+, Pb2+ or Hg2+)
• sulfate ions (except when with Ca2+, Sr2+, Ba2+, Pb2+)

INSOLUBLE

• Metal oxides (except CaO, SrO, BaO)
• Hydroxides (except when with Ca2+, Sr2+, Ba2+)
• Carbonates, phosphates, sulfides, and sulfites (unless bound

to alkali metal or NH4+)

Solubility product - correct answer- Ksp = [A]^a[B]^b

**only products because we don't include solids in the equilibrium expression

for NaCl

• Ksp = x^2

for PbCl2

• Ksp = 4x^3
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for Cr(OH)3

• Ksp = 27x^4

Large Ksp means - correct answer- strong electrolyte (more soluble)

Strong acids - correct answer- So I brought no clean clothes

1. H2SO4

2. HI

• HBr

4. HNO3

• HCl
• HClO4
• HClO3

Strong bases - correct answer- 1. NaOH

• LiOH

3. KOH

• CsOH
• RbOH
• Ba(OH)2
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