If measurements of a gas are 75l and 300 kilo-pascals and then the gas is measured a second time and found to be 50l, describe what had to happen to the pressure (if temperature remained constant). include which law supports this observation.

It depends on the subject for me. some exams are easier than others so i usually go through it and answer questions i know based on my general knowledge, then double check after. going through the lesson can a lot  because the exams can be  very lesson-specific, but sometimes they are ridiculously long so a lot of people don't take the time. i did find that, when i went through the lessons, i was making 100's on my exams vs strictly using + the internet and  i make 90's.