Cicadas are a type of insect. the song of the cicadas is a sound of summer in many parts of the country. which of the following facts about the cicada demonstrates a pattern observed by scientist.
a. cicada shells can often be seen clinging to tree trunks
b. some species of cicadas emerge from the ground every 17 years
c. male cicadas sing in a very loud, distinctive way.
d. cicadas can damage a young tree when laying their eggs in the tree branches

Steam reforming of methane ( ch4) produces "synthesis gas," a mixture of carbon monoxide gas and hydrogen gas, which is the starting point for many important industrial chemical syntheses. an industrial chemist studying this reaction fills a 1.5 l flask with 3.5 atm of methane gas and 1.3 atm of water vapor at 43.0°c. he then raises the temperature, and when the mixture has come to equilibrium measures the partial pressure of carbon monoxide gas to be 1 .0 atm. calculate the pressure equilibrium constant for the steam reforming of methane at the final temperature of the mixture. round your answer to 2 significant digits.