Compare the two atoms: 188 'x' and 178 'y'. how are these atoms related? : a. they are atoms of different elements b. they have the same number of neutrons c. they have different numbers of protons d. they are isotopes of the same element

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

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure