Determine the effectiveness factor for a nonisothermal spherical catalyst pellet in which a first-order isomerization is taking place. additional information: a_i = 100 m^2/m^3 -delta h_r = 800,000 j/mol c_as = 0.01 kmol/m^3 k_t = 0.004 j/m middot s middot k dp = 0.005 m k_1 = 10^-1 m/s e = 100,000 j/mol ts = 400 k de = 8 times 10^-8 m^2/s how would your answer change if the pellets were 10^-2, 10^-4 and 10^-5 in diameter? what are typical temperature gradients in catalyst pellets?

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

Surface currents are caused by blank space . question 14 options: surface currents are caused by? differences in water temperature high salinity differences in density wind forces

If a solution had a ph of 7 what is the solution