Two new planets with equal masses are discovered. planet a is twice as far from the sun as planet b. which of the following is true?
a. the gravitational pull between planet a and the sun is smaller than the gravitational pull between planet b and the sun.
b. the sun's gravitational pull on planet a is equal to its gravitational pull on planet b because distance does not affect gravity.
c. the gravitational pulls between the sun and each of the planets are the same because the masses of the planets are the same.
d. the sun will attract planet b and repel planet a.

What’s a special glass that most beakers are made of

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

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.