A sample of Kr gas in a rigid container has its temperature changed from 18.33 K to 613.44 K. If its new pressure is 2.28 atm, what was its initial pressure in atmospheres?

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

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

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: