the volume of a sample of hydrogen gas was decreased from 14.66 to 7.95 L at constant temperature is the final pressure exerted by the hydrogen gas sample was 7.56 atm what pressure did the hydrogen gas exert before it's volume decreased​

What are the percent by mass of copper in penny lab

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present

Which of these conditions most likely produces an unstable isotope?