Examlex
In an x-ray film of the skeletal system,the dense tissue areas appear ______ because they ______ the x-rays; and the less dense tissues appear ______ because they ______ the x-rays.
Hydrogen Bonds
Weak bonds between a hydrogen atom in one molecule and an electronegative atom in another, crucial for the structure of many biological molecules.
Nonpolar Covalent
Nonpolar Covalent bonds are chemical bonds where two atoms share a pair of electrons equally, resulting in molecules that have no overall dipole moment.
Polar Covalent
A type of chemical bond where electrons are unequally shared between atoms, leading to a distribution of charge.
Proton Acceptor
A substance that receives hydrogen ions in a chemical reaction.
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