I know that a double bond has the two atoms closer to each other than a single bond. I have to build an organic acid model for chemistry and would like to know: - Is there a ratio between the lengths of C-C bonds to C=C bonds? - Are C-H bonds closer together than C-C bonds? - Are C=O bonds closer together than C=C bonds? - If i'm building a model out of styrofoam balls and sticks, would C and O atoms be essentially the same size (i know O has a smaller atomic radius than C, but is it significant) --> i intend on using a colour code (black - C, red - O) The first question is my top priority. Any help would make a huge difference - thanx!