Which is true about fossil fuels?

a.
coal came from ancient plants, while oil and natural gas came from marine organisms.

b.
oil and coal came from dinosaurs, while natural came from marine organisms.

c.
coal came from marine organisms, while oil and natural gas came from fish.

d.
natural gas and oil came from ancient plants, while coal came from dinosaurs.

In which of the following belong to a category called the main group of elements? nonmetals. transition elements. halogens. alkali metals. it can be more than one answer!

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.

Why do elements in groups share more chemical properties than elements in a period?