For most questions on the ACT Science test, you’ll be able to figure out the answers by carefully reading and analyzing the experiments, hypotheses, graphs, and figures in each passage. No outside knowledge of biology, chemistry, physics, environmental science, and other sciences will be required, though it could be helpful to give you a “head start” on the passage.
However, there are some questions, usually 2 to 3 per test, that do require a modicum of outside knowledge about these subjects. The factoids you’ll need to know will be considered “common knowledge” to anyone who has taken a high school level course in those sciences. While it’s impossible to study all of biology, chemistry, physics, etc. in preparation for the ACT Science test, we can cover some of the more likely topics and factoids you’ll need to know to answer these rare questions.
One example is the formula for density. This video will review this formula – try the question in the video first before watching the solution.