Model Comparison: Science

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Gemini 3 Pro

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GPT 5.2 Pro

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What You Need to Know

• The ACT Science test is primarily a reasoning and data-interpretation test—most questions can be answered from the passage even if you don’t remember specific science facts.
• Master three passage styles: Data Representation (graphs/tables), Research Summaries (experiments), and Conflicting Viewpoints (competing explanations).
• Your score depends on speed + accuracy: use a consistent workflow to locate the right figure/table, read axes/units, and answer exactly what’s asked.
• A small toolkit of math and lab-design ideas (slope, proportional reasoning, variables/controls) prevents the most common traps.

Understanding the ACT Science Test (What It Actually Tests)

The ACT Science section is defined by ACT (in its official test prep materials) as a measure of your ability to interpret, analyze, evaluate, and reason using scientific information. It typically presents multiple short passages with charts, tables, and brief text, followed by multiple-choice questions.

Core skill categories (what questions are really measuring)

ACT describes reporting categories that broadly align to these skill areas:

• Interpretation of Data: Read graphs/tables, identify trends, compare values, extrapolate/interpolate.
• Scientific Investigation: Understand experimental design—variables, controls, procedures, and what conclusions are justified.
• Evaluation of Models, Inferences, and Experimental Results: Judge whether claims match evidence; compare models; spot assumptions.

What you should (and shouldn’t) study

• You should study:
  • How to read visual data quickly (axes, units, legends).
  • Experimental logic (independent vs. dependent variables, controls).
  • Basic quantitative reasoning (ratios, percent change, scientific notation).
• You generally shouldn’t treat ACT Science like a memorization-heavy biology/chemistry exam—questions are usually answerable from the passage.

Reality check: how “outside knowledge” shows up

ACT Science occasionally uses familiar scientific terms (e.g., “pH,” “velocity,” “predator/prey”), but the test is designed so that the passage provides what you need. Outside knowledge is most useful for:

• Understanding what a variable name likely represents (e.g., temperature vs. time).
• Knowing directionality for common relationships (e.g., higher temperature often increases reaction rate—though the passage may also specify).

Exam Focus

• Why it matters: Nearly every question rewards process—if you read figures/variables correctly, you can score high without deep content memorization.
• Typical question patterns:
  • “According to Figure 2…” followed by a direct value lookup.
  • “Which conclusion is supported?” requiring matching a claim to the data.
  • “If the experiment were repeated with…” requiring controlled-variable reasoning.
• Common mistakes:
  • Treating it like a knowledge test and overthinking—return to the figure/table.
  • Missing units/labels (e.g., mixing mg and g).
  • Answering a different question than asked (trend vs. exact value).

Data Representation Passages (Graphs, Tables, and Trends)

Data Representation passages primarily test your ability to read and reason from graphs and tables with minimal text.

Your 5-step graph/table workflow

1. Identify the variables: What is on the x-axis and y-axis (or table columns/rows)?
2. Read units and scales: Linear vs. logarithmic; increments; scientific notation; legends.
3. Locate the condition: Which line/bar corresponds to the question’s scenario?
4. Extract the value: Read carefully between ticks (interpolate if needed).
5. Check the direction: Increasing/decreasing; largest/smallest; rate of change.

High-yield graph skills

Interpolation vs. extrapolation

• Interpolation: Estimate between two known points.
• Extrapolation: Extend beyond shown data—ACT may ask this, but it’s riskier; use the displayed trend.

Rate of change (slope) in context

If a question asks “rate,” “per,” or “how fast,” it often means slope:

m = \frac{\Delta y}{\Delta x}

Mini example (worked)
A graph shows temperature T (in ^\circ C) vs. time t (in min). At t = 2, T = 10. At t = 6, T = 30. Rate of change:

m = \frac{30 - 10}{6 - 2} = \frac{20}{4} = 5\ \ ^\circ C/min

Percent change

ACT sometimes frames comparisons as “percent increase/decrease.”

\%\ \text{change} = \frac{\text{new} - \text{old}}{\text{old}} \times 100\%

Mini example (worked)
Old value = 50, new value = 65:

\%\ \text{change} = \frac{65 - 50}{50} \times 100\% = \frac{15}{50}\times 100\% = 30\%

Table reading traps (and how to avoid them)

• Row/column reversal: Confirm which dimension is the independent variable.
• Conditional subsets: Tables may include multiple conditions—match the correct column header (e.g., “Trial 2,” “High Light”).
• Hidden units: A header like “Concentration (\times 10^{-3})” means you must multiply your read value by 10^{-3}.

Fast elimination tactics

• If answers are ranges (e.g., “between 20 and 30”), estimate quickly.
• If a graph is monotonic (always increasing), eliminate any option that claims decreases in that interval.

Exam Focus

• Why it matters: A large share of ACT Science questions are straightforward figure/table lookups or comparisons—fast accuracy here is the easiest point gain.
• Typical question patterns:
  • Direct lookup: “What is y when x = \dots?”
  • Trend/comparison: “Which condition produces the greatest increase?”
  • “At what x does y reach…?” (inverse lookup)
• Common mistakes:
  • Ignoring the legend and using the wrong line/series.
  • Misreading nonzero baselines or uneven tick marks.
  • Confusing “greatest value” with “greatest change.”

Research Summaries Passages (Experimental Design and Conclusions)

Research Summaries passages present one or more experiments with methods, variables, and results—often with multiple figures/tables.

Key definitions (must know)

• Independent variable: What the experimenter changes (the “input”).
• Dependent variable: What is measured (the “output”).
• Controlled variables: Factors kept constant to isolate the independent variable.
• Control group/condition: Baseline for comparison (not always present).
• Trial/replicate: Repeated runs to reduce random error.

Memory aid: I change, D depends.

How to map an experiment quickly

When you read the passage, build a 1-line “experiment map”:

• “They changed ____ (independent) and measured ____ (dependent) while keeping ____ constant.”

Common Research Summaries question types

1) Identify variables

Example prompt style: “In Experiment 1, which is the dependent variable?”

• Find what was measured (often in the y-axis label or in a results column).

2) Predict outcome under a new condition

Example prompt style: “If temperature were increased to X, what would likely happen to the rate?”

• Use the trend in the most relevant figure.
• Keep in mind: ACT expects you to assume “all else equal” unless stated.

3) Evaluate conclusions (supported vs. not supported)

A conclusion is supported only if:

• It matches the direction/magnitude of the data.
• It doesn’t claim causation beyond the design.
• It doesn’t generalize beyond tested ranges/species/materials.

Causation vs. correlation (a frequent trap)

If the design is observational (no variable was actively manipulated), you often cannot conclude “A causes B.”

• Stronger claim: “A is associated with B.”
• Causal claim needs controlled manipulation and exclusion of confounders.

Worked example: identifying a confound

Scenario: Students test plant growth with fertilizer A vs. B. But A plants are by a sunny window and B plants are in shade.

• Independent variable intended: fertilizer type.
• Confound: light exposure differs.
• Correct fix: keep light constant (same location) or randomize placement.

Exam Focus

• Why it matters: These questions test whether you can read procedures like a scientist—identify what changed, what was measured, and what claims are justified.
• Typical question patterns:
  • “Which variable was held constant?”
  • “Which hypothesis is supported by the results?”
  • “How should the procedure be modified to test ___?”
• Common mistakes:
  • Mixing up independent and dependent variables (use the axis labels to confirm).
  • Assuming an untested cause (especially when multiple factors changed).
  • Ignoring which experiment/figure the question references.

Conflicting Viewpoints Passages (Comparing Competing Explanations)

Conflicting Viewpoints passages present two or more students/scientists offering different explanations. Usually there are few or no figures; the skill is careful reading and comparison.

Your comparison framework (fast and reliable)

Create a simple table on scratch paper (mentally or quickly in the margin):

• Viewpoint A: claims, assumptions, what it predicts
• Viewpoint B: claims, assumptions, what it predicts
• Key difference: the one variable/idea they disagree about

What ACT asks you to do

• Identify what each person would say about a scenario.
• Find the precise point of disagreement.
• Determine what evidence would support one view over another.

Typical language cues

• “Student 1 would most likely agree that…”
• “Scientist 2 would most likely predict…”
• “The viewpoints differ in that…”

Worked micro-example (how to answer)

If Student 1 says: “Warming is due to increased solar radiation.”
And Student 2 says: “Warming is due to increased atmospheric gas concentration.”
Then:

• Agreement might be: “Average temperature has increased.”
• Disagreement might be: “Primary cause is solar vs. atmospheric.”
• Evidence favoring Student 2: data showing gas concentration rising while solar output stays constant.

How to avoid the “outside facts” trap

You might know real-world science, but ACT wants what the passage says.

• If a choice is scientifically true but contradicts the passage, it’s wrong.
• Anchor answers in exact wording (“increases,” “decreases,” “no effect”).

Exam Focus

• Why it matters: This passage type is dense and easy to misread; accuracy depends on distinguishing viewpoints, not calculations.
• Typical question patterns:
  • Agreement/disagreement identification.
  • “What would Student X predict if ___?”
  • “Which observation best supports Scientist Y?”
• Common mistakes:
  • Attributing a claim to the wrong person (fix: underline each person’s key claim).
  • Choosing a “true” statement not stated or implied in the passage.
  • Missing qualifiers like “most,” “least,” “only if.”

Quantitative & Scientific Reasoning Tools (Minimal Math You Must Be Fluent In)

ACT Science uses math as a tool. You rarely need advanced formulas, but you must be quick with proportional reasoning, units, and basic computations.

Proportions and scaling

If y is proportional to x, then:

y = kx

So scaling x by a factor scales y by the same factor.

Example (worked)
If doubling x doubles y, and y = 12 when x = 3, then at x = 6, y = 24.

Scientific notation (common in tables/axes)

• Convert: 3.2 \times 10^{4} = 32000
• Multiply: \left(a \times 10^{m}\right)\left(b \times 10^{n}\right) = (ab) \times 10^{m+n}
• Divide: \frac{a \times 10^{m}}{b \times 10^{n}} = \left(\frac{a}{b}\right) \times 10^{m-n}

Unit awareness (quick reference)

You don’t need to memorize every conversion, but you must:

• Match numerator/denominator units to the question.
• Recognize “per” as division.

Common patterns:

• Speed: \frac{distance}{time} (e.g., m/s)
• Density: \rho = \frac{m}{V} (if provided/needed)

Reading logarithmic scales (when they appear)

If an axis is labeled in powers of 10 (e.g., 10^1, 10^2, 10^3), equal spacing means multiplicative changes, not additive.

• From 10^2 to 10^3 is a factor of 10.

Significant figures and precision (practical ACT approach)

ACT usually doesn’t require formal significant-figure rules, but it does test sensible precision:

• Don’t report a value more precise than the graph allows.
• If the graph’s tick marks are every 5 units, an answer like 23.17 is suspicious.

Exam Focus

• Why it matters: Many “hard” questions are actually easy once you translate wording into a proportion, slope, or unit check.
• Typical question patterns:
  • “By what factor does…” (multiplicative reasoning).
  • “Rate” or “per” (division/slope).
  • Axes labeled \times 10^{n} (scientific notation interpretation).
• Common mistakes:
  • Treating a \times 10^{n} axis label as decoration (always apply it).
  • Computing when estimation would eliminate answers faster.
  • Dropping units and choosing an answer with the wrong “per.”

High-Yield Strategy & Time Management (How to Maximize Points)

ACT Science is time-pressured. Your method matters as much as your understanding.

Passage order strategy (choose what fits you)

Two common approaches:

• Strength-first: Do Data Representation first (usually faster), then Research Summaries, then Conflicting Viewpoints last.
• Skip-and-return: If a passage looks dense, skip it immediately and bank easier points.

The “right” approach is the one you can execute consistently under time pressure.

Question-first vs. passage-first

• Data Representation: Often best to go question-first—questions tell you which figure to read.
• Research Summaries: Skim the experiment setup first (variables/procedure), then go to questions.
• Conflicting Viewpoints: Read the viewpoints carefully first; questions depend on wording.

A practical pacing rule

If you’re stuck:

• After about 30–45 seconds with no progress, guess strategically, mark it, and move on.
• You can’t earn points on later questions if you run out of time.

Strategic guessing (how to do it smart)

• Eliminate choices that:
  • Contradict the trend (e.g., says “decreases” when graph increases).
  • Use wrong units or wrong condition.
  • Claim certainty not supported (“proves,” “always”).
• If two choices are opposites (increase vs. decrease), one is often right—go back to the visual and check direction.

Real-world applications (why these skills matter)

ACT Science mirrors how science is used outside school:

• Interpreting health data charts, climate graphs, product testing results.
• Evaluating claims in articles by checking whether data supports conclusions.
• Understanding experiments and deciding what evidence would actually test a claim.

Exam Focus

• Why it matters: Timing and workflow can raise your score quickly—many missed questions are “easy but unseen” due to time loss.
• Typical question patterns:
  • Early questions are often direct lookups; later ones may require synthesis across figures.
  • Conflicting Viewpoints questions reward precise language matching.
• Common mistakes:
  • Reading every word of every passage before looking at questions.
  • Getting trapped in long calculations instead of estimating or eliminating.
  • Changing answers without new evidence (first choice is often correct if supported by the figure).

Quick Review Checklist

• Can you quickly identify the independent variable and dependent variable in an experiment?
• Can you read a graph by checking axes, units, and legend before answering?
• Can you compute slope using m = \frac{\Delta y}{\Delta x} when a question asks for “rate”?
• Can you compute percent change using \%\ \text{change} = \frac{\text{new} - \text{old}}{\text{old}} \times 100\%?
• Can you interpret an axis label like \times 10^{-3} correctly?
• Can you distinguish interpolation (between points) from extrapolation (beyond data)?
• Can you list one confounding variable in a flawed experiment and how to fix it?
• Can you summarize two conflicting viewpoints and state their key disagreement in one sentence?

Final Exam Pitfalls

1. Ignoring units or scale factors (like \times 10^{n}) — Always read the full axis/table header and apply the multiplier.
2. Using the wrong dataset/line — Verify the legend/condition (temperature, group, trial) before extracting a value.
3. Confusing “largest value” with “largest change” — “Greatest” might mean highest y, steepest slope, or biggest difference; match wording.
4. Assuming causation from a trend — Only claim cause if the design isolates variables; otherwise stick to “associated with.”
5. Overreading Conflicting Viewpoints — Don’t bring outside facts; match answers to what each person explicitly claims or implies.
6. Time sink on one question — If you’re stuck, eliminate, guess, and move; protect time for easier lookups.

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Claude Opus 4.6

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What You Need to Know

• The ACT Science section tests your ability to interpret data, analyze experiments, and evaluate scientific arguments — not your memorization of science facts. You have 35 minutes to answer 40 questions across 6–7 passages. Almost everything you need is in the passage, tables, and figures provided.
• Three passage types dominate the exam: Data Representation (graphs/tables), Research Summaries (experimental descriptions), and Conflicting Viewpoints (two or more competing scientific hypotheses). Knowing what each type demands is the single biggest strategic advantage.
• Graph and table literacy is the #1 skill. The majority of questions ask you to read values, identify trends, interpolate, or extrapolate from visual data — quickly and accurately.
• You do NOT need advanced science knowledge. The test covers topics from biology, chemistry, physics, and Earth/space science at a basic level, but passage comprehension and reasoning skills matter far more than content recall.

The ACT Science Section: Format & Strategy

The ACT Science section is one of four scored sections on the ACT. It consists of 40 multiple-choice questions to be completed in 35 minutes, giving you roughly 5 minutes per passage or about 52 seconds per question.

There are 6 or 7 passages, each accompanied by a set of 5–7 questions. Passages are drawn from biology, chemistry, physics, and Earth/space science, but the specific subject matter changes from test to test.

Passage Types

Time Management Strategy

• Do Data Representation passages first — they tend to be the fastest.
• Save Conflicting Viewpoints for last — it requires the most reading and careful comparison.
• If a question is taking more than 60 seconds, mark it and move on.
• You can often answer questions without reading the full passage introduction — go straight to the figures and refer back to the text only when needed.

Exam Focus

• Why it matters: Understanding the format lets you allocate your 35 minutes strategically. Many students run out of time because they read too slowly or spend too long on one passage.
• Typical question patterns:
  • "According to Figure 2, as temperature increases, the rate of reaction…" (Data Representation)
  • "If Experiment 3 were repeated with a pH of 9, the result would most likely…" (Research Summaries)
  • "Scientist 1 would most likely agree with which of the following statements?" (Conflicting Viewpoints)
• Common mistakes:
  • Reading every word of the passage introduction before looking at the questions — this wastes time. Skim the intro and focus on the data.
  • Not distinguishing between passage types and using the same approach for all of them.
  • Spending 8+ minutes on a hard passage while leaving easier ones unfinished.

Data Representation: Reading Graphs, Tables, and Charts

Data Representation passages present scientific data in visual formats — line graphs, bar graphs, scatter plots, and tables — with a brief introductory paragraph. Questions test whether you can accurately read and reason from this data.

Key Skills

1. Reading exact values: Identify the value of a variable at a specific point on a graph or in a table.
2. Identifying trends: Determine whether a relationship is direct (positive), inverse (negative), or non-linear.
   • Direct: as x increases, y increases.
   • Inverse: as x increases, y decreases.
3. Interpolation: Estimating a value between two known data points.
4. Extrapolation: Predicting a value beyond the range of given data by extending the observed trend.
5. Comparing data sets: When multiple curves or columns are shown, identify which variable or condition produces higher/lower values.

How to Approach a Data Representation Passage

1. Read the axis labels and units on every graph and the column headers on every table — before anything else.
2. Note what the independent variable (x-axis) and dependent variable (y-axis) are.
3. Look for titles, legends, and keys that distinguish between multiple data sets.
4. Go directly to the questions and refer back to specific figures as needed.

Worked Example

Imagine a table showing:

Question: "Based on the data, as concentration doubles, reaction time approximately…"

Solution: From Trial 1 to Trial 2, concentration doubles (0.10 → 0.20) and time decreases from 45 to 30. From Trial 2 to Trial 3, concentration doubles again (0.20 → 0.40) and time drops from 30 to 18. The trend is an inverse relationship — as concentration increases, reaction time decreases. More specifically, each doubling of concentration reduces reaction time by roughly one-third to one-half.

Exam Focus

• Why it matters: Data Representation questions make up approximately 30–40% of all Science questions. They are typically the easiest and fastest to answer.
• Typical question patterns:
  • "According to Table 1, the value of [variable] at [condition] is closest to…" (direct read)
  • "Based on Figure 1, which of the following best describes the relationship between X and Y?" (trend identification)
  • "If the experiment were extended to a temperature of 100°C, the pressure would most likely be…" (extrapolation)
• Common mistakes:
  • Misreading the axis — confusing the x-axis variable with the y-axis variable, or reading the wrong scale when two y-axes are used.
  • Selecting a value from the wrong curve or data set when multiple are plotted on the same graph.
  • Confusing interpolation with extrapolation and not recognizing when a trend might change outside the data range.

Research Summaries: Understanding Experimental Design

Research Summary passages describe one or more experiments. They include background information, the experimental procedure, and results (usually in tables or graphs). Questions test your understanding of why the experiment was set up a certain way and what the results mean.

Key Concepts

• Independent variable: The factor the researcher deliberately changes between trials or experiments.
• Dependent variable: The factor that is measured as a result.
• Control variables (constants): Factors kept the same across trials to ensure a fair test.
• Control group: A baseline group that receives no treatment, used for comparison.
• Hypothesis: A testable prediction about the relationship between variables.

What the Questions Ask

1. Identifying variables: "What is the independent variable in Experiment 2?"
2. Purpose of a step: "Why did the researchers add a buffer solution?" — usually to control pH or maintain consistent conditions.
3. Comparing experiments: "How does Experiment 1 differ from Experiment 2?" — typically one variable was changed.
4. Drawing conclusions: "The results of Experiment 3 support which hypothesis?"
5. Predicting new results: "If the researchers repeated the experiment at a higher altitude, the boiling point would most likely…"
6. Designing follow-up experiments: "Which additional experiment would best test whether Factor X affects the outcome?"

How to Approach

1. Skim the introduction for context but spend most time on the procedure and results.
2. For each experiment, identify: What changed? What was measured? What stayed the same?
3. When comparing multiple experiments, look for the one variable that differs between them.

Worked Example

Experiment 1: Students measured the distance a ball rolled on a smooth surface when released from heights of 10 cm, 20 cm, 30 cm, and 40 cm.

Experiment 2: The same setup was used, but the surface was covered in sandpaper.

Question: "What is the purpose of Experiment 2?"

Answer: To test the effect of surface friction on rolling distance. Experiment 1 and 2 differ only in surface type, so that is the variable being investigated.

Exam Focus

• Why it matters: Research Summaries are the most common passage type (roughly 45% of questions) and test both data reading and conceptual understanding of the scientific method.
• Typical question patterns:
  • "In Experiment 1, the dependent variable is…" (variable identification)
  • "Which of the following changes between Experiment 2 and Experiment 3?" (comparison)
  • "Do the results support the hypothesis that…?" (conclusion)
  • "To determine whether temperature affects the rate, the students should…" (experimental design)
• Common mistakes:
  • Confusing the independent and dependent variables — remember, the independent variable is what you change, the dependent is what you measure.
  • Assuming that correlation implies causation without checking whether other variables were controlled.
  • Not reading each experiment's procedure carefully — students often miss the one critical difference between experiments.

Conflicting Viewpoints: Comparing Scientific Arguments

The Conflicting Viewpoints passage presents two or more perspectives (labeled Scientist 1, Scientist 2, Student 1, etc.) on a scientific question. These perspectives may partially agree, partially disagree, or completely contradict each other.

This passage type is the most reading-intensive on the ACT Science section.

Key Skills

1. Summarizing each viewpoint: Be able to state each position in one sentence.
2. Identifying points of agreement: What do both scientists accept as true?
3. Identifying points of disagreement: Where exactly do they diverge?
4. Evaluating evidence: Which evidence supports or weakens each viewpoint?
5. Applying viewpoints to new information: If a new discovery were made, which scientist's view would it support?

How to Approach

1. Read the introductory paragraph carefully — it sets up the shared background.
2. Read Viewpoint 1 fully, then pause and summarize it mentally in one sentence.
3. Read Viewpoint 2 fully and note specifically where it differs from Viewpoint 1.
4. If there is a Viewpoint 3, compare it to both previous ones.
5. Answer questions by referring back to specific lines in each viewpoint — don't rely on memory alone.

Memory Aid: "CLAIM"

• C — What is each scientist's Claim (main argument)?
• L — What Logic or reasoning do they use?
• A — What Assumptions does each make?
• I — What is the key Issue or disagreement?
• M — What new Measurement or evidence would settle the debate?

Exam Focus

• Why it matters: The Conflicting Viewpoints passage appears once per test (sometimes with 7 questions) and is where students lose the most time. It requires careful reading rather than quick data lookups.
• Typical question patterns:
  • "Scientist 1's view differs from Scientist 2's view in that Scientist 1 believes…" (comparison)
  • "Both scientists would most likely agree that…" (common ground)
  • "Suppose a fossil were found in a rock layer dated at 2 million years. This finding would most strongly support…" (applying new evidence)
  • "Which of the following assumptions is made by Student 2 but NOT by Student 1?" (assumption identification)
• Common mistakes:
  • Mixing up which scientist said what — always check the label (Scientist 1 vs. 2) before answering.
  • Bringing in outside knowledge or personal opinions instead of relying strictly on what the passage states.
  • Rushing through the reading and missing subtle but critical differences in the arguments.

Background Science Knowledge

While the ACT Science section is primarily skills-based, a small number of questions (roughly 3–5 per test) assume basic scientific literacy. You won't be asked to recall complex formulas, but you should be familiar with foundational concepts.

Biology

• Photosynthesis: Plants convert CO2 + H2O into glucose and O_2 using light energy.
• Cellular respiration: Cells convert glucose and O2 into CO2, H_2O, and ATP (energy).
• DNA: Stores genetic information; double helix structure; bases are A, T, G, C.
• Natural selection: Organisms with advantageous traits survive and reproduce more successfully.
• Cells: Animal cells lack cell walls and chloroplasts; plant cells have both.

Chemistry

• pH scale: 0–14; below 7 is acidic, 7 is neutral, above 7 is basic.
• States of matter: Solid → liquid → gas as temperature increases.
• Solutions: Solute dissolves in a solvent; concentration describes how much solute is present.
• Atomic structure: Protons (positive, in nucleus), neutrons (neutral, in nucleus), electrons (negative, orbit nucleus).

Physics

• Speed: v = \frac{d}{t} (distance divided by time).
• Force: F = ma (mass times acceleration).
• Gravity: Objects near Earth's surface accelerate at approximately 9.8 \, m/s^2.
• Energy conservation: Energy is neither created nor destroyed, only transformed.

Earth/Space Science

• Plate tectonics: Earth's crust is divided into plates that move, causing earthquakes and volcanic activity.
• Layers of the atmosphere: Troposphere (weather), stratosphere (ozone layer), mesosphere, thermosphere.
• Water cycle: Evaporation → condensation → precipitation → collection.

Exam Focus

• Why it matters: A handful of questions each test require outside knowledge. Getting these right can be the difference of 1–2 points on your scaled score.
• Typical question patterns:
  • "Which of the following processes releases CO_2 into the atmosphere?" (requires knowing cellular respiration)
  • "An increase in pH from 5 to 7 means the solution became more…" (requires knowing the pH scale)
  • Questions where two answer choices remain plausible from the passage alone, and basic science knowledge breaks the tie.
• Common mistakes:
  • Over-studying science content and under-practicing data interpretation — the ratio should be roughly 80% skills / 20% content.
  • Applying advanced science knowledge that contradicts what the passage states — always defer to the passage.
  • Not knowing basic unit conversions (e.g., mL to L, or Celsius to Kelvin: K = °C + 273).

Advanced Reasoning: Calculations and Multi-Step Questions

A small number of ACT Science questions require simple calculations or multi-step reasoning.

Types of Calculations

• Percentages: "What percent of the original mass remained after the reaction?"
  • \text{Percent} = \frac{\text{Part}}{\text{Whole}} \times 100
• Averages: "What is the average temperature across the four trials?"
  • \text{Mean} = \frac{\text{Sum of values}}{\text{Number of values}}
• Ratios and proportions: "If the concentration is tripled, what would the expected rate be based on the pattern?"
• Unit analysis: Checking that units cancel correctly.

Multi-Step Reasoning

Some questions require combining information from multiple figures or experiments:

• "Based on Figure 1 AND Table 2, which trial produced the highest efficiency?"
• Cross-reference by finding a shared variable (e.g., Trial number, temperature) between the two data sources.

Exam Focus

• Why it matters: These questions are typically among the hardest on the test and are good opportunities to gain points if you're comfortable with basic math.
• Typical question patterns:
  • "Based on the data in Table 1, the percent decrease in mass from Trial 1 to Trial 4 is closest to…"
  • "Using Figures 2 and 3 together, at what temperature does Species A surpass Species B in population?"
• Common mistakes:
  • Arithmetic errors under time pressure — slow down for calculation questions; they're worth the same as easier ones.
  • Looking at only one figure when the question explicitly references two.
  • Forgetting to check units in the answer choices.

Quick Review Checklist

• ☐ Can you identify the three ACT Science passage types and adjust your strategy for each?
• ☐ Can you read exact values from a graph, including interpolating between data points?
• ☐ Can you identify direct and inverse relationships from a graph or table?
• ☐ Do you know how to distinguish the independent variable, dependent variable, and control variables in an experiment?
• ☐ Can you explain why two experiments differ (i.e., what variable is being tested)?
• ☐ Can you summarize each viewpoint in a Conflicting Viewpoints passage in one sentence?
• ☐ Can you identify where two scientists agree and where they disagree?
• ☐ Do you know basic science facts — pH scale, photosynthesis vs. respiration, F = ma, states of matter?
• ☐ Can you perform simple percent and average calculations quickly?
• ☐ Can you cross-reference data from two different figures or tables to answer a question?

Final Exam Pitfalls

1. Reading the entire passage before looking at questions. The ACT Science section rewards efficiency. For Data Representation and Research Summary passages, skim the intro and go straight to the questions, then refer back to specific figures. Only Conflicting Viewpoints requires thorough upfront reading.

2. Misreading graph axes or table headers. Many wrong answers come from reading the wrong axis, the wrong unit, or the wrong column. Before extracting any value, confirm you're looking at the correct variable and the correct scale. Watch especially for dual y-axes.

3. Confusing which scientist holds which view. On Conflicting Viewpoints questions, always re-check the passage before answering. Students frequently attribute a claim to the wrong scientist, especially when viewpoints share some common ground.

4. Bringing outside knowledge that contradicts the passage. If a passage describes a fictional experiment where a heavier ball falls slower (perhaps due to air resistance in a specific scenario), the correct answer is based on the passage data — not your physics class. The passage is always the authority.

5. Spending too long on one passage. No single passage is worth more than 7 questions. If a passage is confusing, answer what you can, guess on the rest, and move to the next passage. You can return if time permits. Losing time on a hard passage means losing easy points elsewhere.

6. Ignoring answer choices that say "cannot be determined." Occasionally, the correct answer is that the data does not support a conclusion. Students often force an answer from the data when the honest conclusion is that there isn't enough information. If the question asks about a variable not tested in the experiment, "cannot be determined" may be correct.