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A1.10 · Draw and justify conclusions from inquiry and research evidence

Learn to draw and justify conclusions from inquiry and research evidence through clear examples and targeted practice.

Ontario Grade 12 Chemistry

Scientific Investigation Skills and Career Exploration

A practical approach to inquiry and research evidence in chemistry

A conclusion is not simply a summary of what happened. It is a claim that answers an inquiry question and is supported by evidence. In chemistry, evidence may include visible changes, measured quantities, or results reported by researchers. To judge a conclusion, first ask what was observed or measured. Then consider what pattern the evidence supports, how strongly it supports it, and what limits the claim. This lesson focuses on that reasoning process. It does not assume that any investigation described here was carried out.

What you will learn

Separate observations and measurements from interpretations and conclusions.
Use relevant evidence to support a conclusion without claiming more than the evidence shows.
Identify patterns, limitations, and possible sources of uncertainty in an inquiry or research report.
Communicate a conclusion with a clear link between the evidence and the claim.

From observation to conclusion

A brief prerequisite: an observation is information collected using the senses or an instrument. A qualitative observation describes a quality, such as a colour change. A quantitative observation includes a number and a unit, such as a temperature of 24.6 °C. Evidence is information used to support or challenge a claim. In an inquiry, observations and measurements become evidence when they are relevant to the question.

Imagine that a solution changes colour after another substance is added. The colour change is observable evidence. At the particle level, it may indicate that substances have changed or that a new substance has formed, but the colour change alone does not identify exactly what happened. A conclusion must stay within what the evidence can support.

A useful conclusion has three parts: an answer to the question, specific evidence, and reasoning that explains how the evidence supports the answer. This link between evidence and reasoning matters. A measurement does not explain itself; the writer must show why it is relevant.

Observation: what was seen or measured.
Evidence: relevant observations or measurements used to support a claim.
Conclusion: an answer to the inquiry question, supported by evidence and reasoning.

Build a fair and useful comparison

Before drawing a conclusion, check how the evidence was produced or gathered. In a classroom inquiry, a fair comparison changes the factor being investigated while keeping other relevant conditions as similar as possible. A variable is a factor that can change. The factor deliberately changed is the independent variable; the measured response is the dependent variable. These terms help explain what was compared, but they do not replace examination of the actual results.

Look for repeated measurements or multiple trials. Repetition can show whether a pattern is consistent or whether one result differs from the others. It does not guarantee that every possible source of error has been removed. A source of uncertainty is a factor that may affect how precisely a result is known, such as limited instrument resolution or small differences in procedure.

For research evidence, ask who collected the data, what was measured, how the comparison was made, and whether the reported evidence directly addresses the question. A source may be useful for one claim but not another. For example, evidence about a substance's colour does not, by itself, establish its concentration.

Keep observations separate from explanations. “The reading increased” reports a result. “The reaction became faster” is an interpretation that needs a suitable measure and comparison. Clear wording lets a reader see where the evidence ends and the interpretation begins.

Check that the evidence measures something relevant to the question.
Consider repeated results, comparison conditions, and uncertainty.
Label interpretations as interpretations, not as direct observations.

Decide what the evidence can support

A pattern is a repeated or noticeable relationship in the evidence. For example, a measured value may rise across several conditions. A conclusion can describe that pattern, but it should not claim a cause unless the comparison supports that claim. A relationship between two measured quantities does not automatically show that one caused the other.

Compare the strength of the wording with the strength of the evidence. If results from several trials show the same trend, “the results support the claim that…” may be reasonable. If there is only one measurement or the results conflict, use more cautious language, such as “these results suggest…” or “the evidence is not sufficient to decide.” Cautious wording is not weakness; it is accuracy.

A conclusion should also state relevant limits. A small data set may not represent all conditions. A measurement with limited precision may not distinguish between close values. If evidence comes from a research source, its methods or scope may limit how broadly its finding applies. State a limitation only when it matters to the conclusion.

Do not treat agreement with an expected result as proof. Evidence can support a claim, leave it uncertain, or conflict with it. If the evidence conflicts with the claim, report that honestly and explain what the data show instead.

Describe the pattern before explaining it.
Do not claim cause, certainty, or broad applicability without supporting evidence.
Acknowledge limitations that affect the conclusion.

Present the conclusion clearly

Use the inquiry question to keep the conclusion focused. Include enough evidence for a reader to check your reasoning. If you use numbers, include units and report only as many digits as the measurements justify. Do not hide results that disagree with your claim.

A useful writing frame is: “The evidence [supports, suggests, or does not support] the claim that . In the results, . This matters because . One limitation is .” Fill each blank with information from the inquiry or source. Do not add a chemical explanation that the evidence has not tested.

When drawing from research, distinguish the researchers’ reported results from your own interpretation. Paraphrase the relevant finding accurately, and identify the limits of what it answers. A conclusion is strongest when its claim is narrow, its evidence is specific, and its reasoning is easy to follow.

Answer the question directly.
Quote or summarize the relevant evidence accurately.
Explain the link between the evidence and the claim, then state a meaningful limitation.

A quick evidence check

Question to ask	Why it matters
Does the evidence answer the inquiry question?	Irrelevant results cannot support the claim.
Is there a pattern across the results?	A consistent pattern is stronger support than a single result.
What limits the evidence?	Limits help set the proper scope and confidence of the conclusion.

Worked example

Judging a claim from supplied inquiry data

A student is given the following hypothetical data for a question: “Does increasing the temperature of a solution increase the time taken for a tablet to disappear?” The data are supplied for this reasoning exercise; they are not results from an investigation performed for this lesson. At 20 °C, the tablet took 92 s and 88 s in two trials. At 40 °C, it took 61 s and 65 s. Decide what conclusion these data support, and state one limitation.

Identify the measurements
The dependent measurement is the time for the tablet to disappear, recorded in seconds. The two temperatures are the conditions being compared. The evidence consists of four times, not a direct measurement of a particle-level process.
Compare the results
At 20 °C, the two times are close to 90 s. At 40 °C, both times are close to 60 s. Each recorded time at 40 °C is shorter than each recorded time at 20 °C, so the data show a consistent difference in these trials.
Write a supported conclusion
A suitable conclusion is: “In the supplied data, the tablet disappeared in less time at 40 °C than at 20 °C. These results support the claim that the higher-temperature condition is associated with a shorter disappearance time.” This wording reports the comparison without claiming that the data establish every detail of why it occurred.
Add a limitation
There are only two trials at each temperature. The supplied data do not show whether the same pattern would hold for other tablets, solutions, or temperatures. Also, the question asks about disappearance time; that observation alone does not identify all changes occurring in the solution.

Answer: The supplied results support a limited conclusion: the tablet disappeared in less time at 40 °C than at 20 °C in these trials. The evidence does not establish that this pattern applies to all conditions.

Check: The conclusion uses the measured times, includes the scope of the comparison, and avoids presenting a possible explanation as a measured fact.

Common mistakes and how to avoid them

Repeating the results but not answering the inquiry question.

Correction: State a direct claim, then use the results to support it.

Treating one observation as proof of a broad claim.

Correction: Limit the conclusion to the conditions and evidence actually considered.

Describing an interpretation as if it were directly observed.

Correction: Separate what was measured from what you infer the measurement means.

Ignoring results that do not fit the expected pattern.

Correction: Report the full relevant evidence and explain how it affects the conclusion.

Lesson summary

A conclusion answers an inquiry question using relevant evidence and clear reasoning.
Check how evidence was gathered, what pattern it shows, and what may limit it.
Use cautious wording when the data are limited or inconsistent.
Keep the claim within the scope of the evidence and distinguish observations from interpretations.

Check your understanding

Question 1

A report lists a colour change but does not state what question the observation answers. What is the main issue?

The observation cannot be evidence unless it is numerical.
The relevance of the observation to a claim has not been explained.
A colour change always proves that a particular product formed.
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Show answer and explanation

The relevance of the observation to a claim has not been explained.

Qualitative observations can be evidence, but the writer must explain how they relate to the inquiry question and conclusion.

Question 2

Two trials show a shorter disappearance time at the higher temperature. Which conclusion is best supported?

The tablet will always disappear faster at every higher temperature.
The results support a shorter disappearance time at the higher temperature under the tested conditions.
The data prove exactly which particle changes caused the difference.
correctIndex

Show answer and explanation

The results support a shorter disappearance time at the higher temperature under the tested conditions.

The conclusion states the observed comparison and limits it to the conditions represented by the data.

Question 3

Why should a conclusion mention a limitation when it affects the claim?

To make the evidence seem less useful.
To show how far the evidence can reasonably support the claim.
To replace the conclusion with a list of possible errors.
correctIndex

Show answer and explanation

To show how far the evidence can reasonably support the claim.

A relevant limitation helps the reader understand the scope and strength of the conclusion.

Key terms

Observation: Information collected through the senses or an instrument.
Evidence: Relevant information used to support or challenge a claim.
Variable: A factor that can change in an inquiry.
Uncertainty: A limit on how precisely a result is known.
Pattern: A repeated or noticeable relationship in evidence.

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About this lesson and its review

Published by DoAssignment. This reviewed lesson follows Ontario Grade 12 Chemistry (SCH4U), expectation A1.10. It is a study resource, not an official curriculum publication.

Before publication, content is checked for structure, mathematical or chemical notation, calculations, course boundaries, and readability. Errors can still occur, so corrections are welcomed.

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