All topicsA sample of a pure substance is placed in a sealed, rigid container and the pressure is measured as a function2024 national · question 175%Which liquid has the highest vapor pressure at 25 °C?2020 national · question 1313%An adjustable-volume container holds 10.0 g pentane (M = 72.15, normal boiling point = 36.1 ºC). The pressure 2019 national · question 1620%
States of matter
This is block 3 of 10, questions 13–18 on both the local section exam and national Part I. Across the 42 national questions where ACS published item statistics, qualifiers answered 50% correctly, which makes it the seventh hardest of the 10.
What it covers
gas lawskinetic molecular theoryintermolecular forcesphase diagramscolligative propertiessolubilitycrystal structures
Where qualifiers lose points
% who got it rightThese are the states of matter questions the fewest national qualifiers answered correctly. If you can do these, the block is not your problem.
Every question is from a published past exam and carries its source. Practice adapts to what you miss, and anything you get wrong comes back on a spaced schedule. No account needed. See the other nine blocks.