ACT Science 2

Question 1

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?

Accepted Answer

The enzyme or catalyst has denatured or reached saturation

Answer

Temperature stopped increasing

Answer

The reaction reversed direction

Answer

Measurement error occurred

Question 2

Two scientists disagree about whether a planet's water came from comets or volcanic outgassing. This passage type on the ACT is called:

Accepted Answer

Conflicting Viewpoints

Answer

Data Representation

Answer

Research Summaries

Answer

Experimental Design

Question 3

A table lists density values for four liquids. Which liquid will float on top if poured into one container?

Accepted Answer

The one with the lowest density

Answer

The one with the highest density

Answer

The one with the most volume

Answer

The one tested last

Question 4

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:

Accepted Answer

Provide a baseline for comparison

Answer

Increase the treatment dose

Answer

Speed up the reaction

Answer

Reduce the sample size

Question 5

A line graph shows two variables that rise together in a straight diagonal line. This relationship is best described as:

Accepted Answer

Directly proportional

Answer

Inversely proportional

Answer

Exponential

Answer

No correlation

Question 6

An experiment measures plant growth at pH 4, 6, 7, and 9, with tallest growth at pH 7. What is the independent variable?

Accepted Answer

pH of the solution

Answer

Plant height

Answer

Amount of sunlight

Answer

Number of leaves

Question 7

A passage states a result occurred 'at standard temperature and pressure (STP).' STP is most useful in ACT Science questions because it:

Accepted Answer

Sets a fixed reference condition for comparing gas measurements

Answer

Guarantees a chemical reaction occurs

Answer

Eliminates the need for a control group

Answer

Doubles the reaction rate