When the difference is 0.4 - 2, the bond is called polar covalent. A variety of things are added to gasoline in the winter months to reduce carbon monoxide emissions. These additives must burn cleanly so as not to add to the problems they are used to solve. Write balanced equations for the complete combustion of these two gasoline additives. Electronegativity is the tendancy of an atom to attract electrons to itself.
Ice consists of water molecules held rigidly in place by a network of hydrogen bonds.
When energy is added to the ice, the water molecules begin to move faster. When water evaporates, the molecules move from the liquid phase to the gas phase. This means that the water molecule must break all the hydrogen bonds that hold it in the liquid phase. Sketches may be useful to clarify your answers. Give an example of hydrogen bonding which is critial to human existance.