Use Hess’s Law and solve for the enthalpy change of the following rxn: 12 P(s) + 10 Fe2O3 (s) -> 3 P4O10 (s) + 20 Fe (s)

2 C2H6 (l) + 7 O2 (g) -> 4 CO2 (g) + 6H2O (g)

Butadiene undergoes a reaction at a certain temperature in the gas phase as follows: 2c4h6(g) --> c8h12(g) the following data were collected for this reaction: time (min) [c4h6] (m) 0 0.36 15 0.30 30 0.25 48 0.19 75 0. determine the order of the reaction and the rate constant. 1st order and k = 4.3x10 -4 s-1 1st order and k = 2.3x10-4 s-1 2nd order and k = 4.3x10-4 s-1 2nd order and k = 2.3x10-4 s-1 zero and k = 4.3x10-4 s-1

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon