Science Flashcards
7 cards from real ACT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Science flashcards as text
On an ACT Science data representation passage, a graph shows reaction rate increasing then leveling off as temperature rises. What does the leveling-off most likely indicate?
Answer: The enzyme or catalyst has denatured or reached saturation
A plateau in rate despite rising temperature usually signals denaturation or saturation of the catalyst.
Two scientists disagree about whether a planet's water came from comets or volcanic outgassing. This passage type on the ACT is called:
Answer: Conflicting Viewpoints
Passages presenting opposing hypotheses are Conflicting Viewpoints passages.
A table lists density values for four liquids. Which liquid will float on top if poured into one container?
Answer: The one with the lowest density
Less dense liquids float above denser ones.
In a Research Summaries passage, Experiment 2 differs from Experiment 1 only by adding a control group with no treatment. The purpose of this control is to:
Answer: Provide a baseline for comparison
A control group establishes a baseline against which treated groups are compared.
A line graph shows two variables that rise together in a straight diagonal line. This relationship is best described as:
Answer: Directly proportional
A straight upward line through the origin indicates direct proportionality.
An experiment measures plant growth at pH 4, 6, 7, and 9, with tallest growth at pH 7. What is the independent variable?
Answer: pH of the solution
The independent variable is what the experimenter deliberately changes—here, pH.
A passage states a result occurred 'at standard temperature and pressure (STP).' STP is most useful in ACT Science questions because it:
Answer: Sets a fixed reference condition for comparing gas measurements
STP provides a standardized reference so gas data can be fairly compared.