Acarbon nanotube is a sheet of graphite rolled into a tube as shown. they were discovered in 1992 by accident and represent extremely exciting new materials since they are very strong (100 times the tensile strength of steel), can store hydrogen, and are excellent candidates for new electronic displays. they are made by a variety of techniques, one of which is the catalytic decomposition of ethane over cobalt and iron catalysts supported on silica. the two relevant reactions that occur simultaneously are: c2h6 → 2c + 3h2 c2h6 → c2h4 + h2 if you collect 3 kmol/h of h2 and 0.5 kmol/h of c2h4 during the production what is the selectivity of carbon nanotubes (c) relative to ethylene (c2h4)?

Achemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. an example of a chemical reaction is the formation of water from hydrogen and oxygen gas.in a physical change, a substance changes its physical appearance but not its chemical identity. an example of physical change is the formation of liquid water from solid water, a familiar process called melting. physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? oxygen gas changes to ozone during thunderstorms carbon dioxide is produced by the combustion of gasoline in an automobile engine. when coal, oil, and natural gas are decomposed in landsills they produce methane gas. freezing rain develops when a warm air mass overrides a cold air mass. fog forms from water vapor when the temperature drops below the dew point

Analyze how limestone is weathered and identify the features that are formed as a result of this dissolution

Salt in oceans comes from and of rocks