Examlex
An astronomer measures a galaxy to have an apparent recession velocity of 2,100 km/s.How far away is the galaxy?
Hydrogen Chloride
A diatomic molecule composed of hydrogen and chlorine; when dissolved in water, it forms hydrochloric acid.
Lewis Structure
A representation of molecules showing how the valence electrons are arranged among atoms in the molecule.
Ethane
A colorless, odorless gas that is the second simplest alkane, consisting of two carbon atoms and six hydrogen atoms.
Double Bonds
Chemical bonds between two atoms involving four bonding electrons instead of the usual two, making the bond stronger and the structure more rigid.
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