Day 8: Hydrocarbon Molecules
A substance made up of covalently bonded molecules is called a covalent molecular substance. Covalent molecular substances usually have similar properties, such as boiling points that increase as the sizes of their molecules increase (because of increased LDFs as the molecules get bigger). Hydrocarbons, compounds of hydrogen and carbon, are good examples of covalent molecular substances. In alkanes all C–C and C–H bonds are single bonds. In alkenes there is at least one carbon-carbon double bond, and in alkynes there is at least one carbon-carbon triple bond. Hydrocarbons are found in nature as petroleum (literally “rock oil”) and can be separated by distillation, which separates substances with different boiling points. The various ways by which atoms and molecules are attracted to each other are summarized in this day’s last section.
Here are links to all sections of the work for Day Eight. Be sure to complete them before your whole-class meeting.
D8.1 Covalent Molecular Substances
D8.2 Hydrocarbons
D8.3 Alkanes
D8.4 Alkenes
D8.5 Alkynes
D8.6 Petroleum Chemistry
D8.7 Attractive Forces Between Atomic-scale Particles
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