Semmelweis entrance exam chemistry
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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?
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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)
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)
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