4. which of the following materials is necessary to stop a beta particle? (1 point)
three feet of concrete
three inches of lead
thin pieces of wood
single sheet of paper
5. a neutron breaks down to form (1 point)
an alpha particle
two protons
a proton and an electron
a helium nucleus
6. what does the band of stability for atomic nuclei refer to? (1 point)
the ratio of protons to neutrons
the ratio of neutrons to protons
the ratio of beta particles to neutrinos
the ratio of alpha particles to beta particles

What is the compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-

Who discovered a pattern to the elements in 1869?

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.