Butane, (CH3CH2CH2CH3) and methyl propane, (CH3CH(CH3)CH3). The old, non-IUPAAC name for the latter is Isobutane. Both, of course have the same empirical formula of C4H10.
Copper is an element itself.
Valleys, Mountains, and Rivers, occasionally volcanoes... ~:)
Hot spots!
Water or H2O. Hydrogen and Oxygen bond together to form a molecule of water.
The Perfect Squat
How to Trim or Prune a Shrub
Sugar Sweet Sunshine Bakery - NY, New York
Justin's Bone Marrow Transplant