Nitrogen (N) normally forms three covalent bonds with a valence of five. However, ammonium has four covalent bonds, each to a different hydrogen (H) atom (H has a valence of one). What do you predict to be the charge on ammonium?

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#Question id: 294

#Section C (Domain-Specific Knowledge)

Which of the following pairs of amino acids would you predict to only participate in Van der Waals interactions in the three dimensional folding of a protein:

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#Question id: 27210

#Section C (Domain-Specific Knowledge)

Charge on one mol of electron is approximately equal to

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#Question id: 27211

#Section C (Domain-Specific Knowledge)

 A biological redox reaction always involves

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#Question id: 27375

#Section C (Domain-Specific Knowledge)

An atom of sodium has an atomic number of 11 and a mass number of 23. Which of the following statements is correct?

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#Question id: 27376

#Section C (Domain-Specific Knowledge)

The number of neutrons is equal to

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#Question id: 27377

#Section C (Domain-Specific Knowledge)

Calculate the number of electrons, protons and neutrons in 1 mole of 16O⁻² ions.