The electron transport chain is a chemical reaction where electrons are transferred from a high-energy molecule to a low-energy molecule. These reactions can be used to convert energy from sunlight in photosynthesis or extract energy from sugars in respiration.
The bond between monomers of carbohydrates, e.g. glucose and fructose is a glycosidic bond-forming in this case a sucrose molecule (disaccharide). A glycosidic linkage is a C-O-C bond (ether). The underlying reaction is a condensation reaction where 1 OH- and 1 H+ are split off resulting in the formation of H2O.
Slate is metamorphosed shale, so it is technically harder and a lot more dense than shale.