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A1.11 · Communicate chemistry procedures, results, and conclusions clearly

Learn to communicate chemistry procedures, results, and conclusions clearly through clear examples and targeted practice.

Ontario Grade 11 Chemistry

Scientific Investigation Skills and Career Exploration

Ontario Grade 11 Chemistry — A1.11

In chemistry, a result is useful only if people can understand how it was obtained and what it shows. A reader should be able to follow the procedure, interpret the recorded evidence, and see how the conclusion follows from that evidence. A1.11 focuses on communicating procedures, results, and conclusions clearly. It is not enough to write that an experiment “worked.” You must provide relevant details and use precise language.

What you will learn

Organize a chemistry report so another person can understand what was done, observed, and concluded.
Write procedures that are clear, ordered, and detailed enough to repeat.
Present results with suitable labels, units, and a clear distinction between observations and interpretations.
Write conclusions that answer the purpose and are supported by the recorded results.

1. Connect the observation to the report

Start with what can be observed. For example, a solid may appear in a liquid, a colour may change, or a measured mass may differ from its earlier value. An observation is a record of what was seen, heard, or measured. It should be specific and should not claim more than the evidence shows.

Chemistry also uses particle models to explain observations. A particle model is a simplified way to describe matter in terms of particles, such as atoms, molecules, or ions. When you report a model-based explanation, keep it separate from the observation. “The liquid became cloudy” is an observation. “Particles formed a solid that did not dissolve” is an interpretation based on a model.

Before writing a report, review the investigation’s purpose and the measurements or observations you recorded. A variable is a factor that can change in an investigation. Identify which factors were changed, measured, or kept the same when that information matters to explaining the procedure or results. Do not add details you did not record.

Record observations in neutral, specific language.
Label explanations as interpretations rather than presenting them as direct observations.
Use only evidence that was actually collected.

2. Write a procedure another person can follow

A procedure is the ordered set of actions used in an investigation. Write each action in the order it happened. Name the materials and equipment when they affect what the reader needs to do. Include quantities, units, and important conditions that were recorded, such as the amount used or the time allowed.

Use precise instructions. “Add some liquid” is unclear because “some” has no set amount. If the amount was measured, report its value and unit. If it was not measured, do not invent a value after the investigation. Likewise, say which equipment was used when the choice matters. “Measure the volume with a graduated cylinder” gives more useful information than “measure it.”

A procedure should be concise but complete. Avoid unnecessary commentary, and do not skip a step that could affect what happens next. Use numbered steps or short paragraphs to make the sequence easy to scan. Report safety instructions that apply to the actual procedure, but do not claim that a precaution was followed unless it was.

A repeatable procedure lets another person carry out the same planned actions. It does not guarantee identical results, but clear details make the method easier to understand and compare.

Put actions in the order performed.
Give recorded quantities with units and name relevant equipment.
Never fill gaps in a record by guessing.

3. Present results so they can be understood

Results are the observations and measurements collected during an investigation. Keep them separate from explanations of why they occurred. A results section should make it easy to find what was recorded without requiring the reader to search through a long paragraph.

For a measurement, include the quantity, value, and unit. A unit tells the reader what the number measures. For example, a mass could be reported in grams, and a volume in millilitres. A number without a unit may be unclear. Include clear column headings if you use a table. Put units in headings when every value in a column uses the same unit.

Keep the precision of a result consistent with the measuring tool and the recorded data. Do not add decimal places that were never measured. Significant digits are the digits that communicate a measurement’s precision. For this expectation, the key communication rule is to preserve the precision supported by the recorded measurement rather than making it seem more exact.

Use a graph only when it helps the reader see a pattern in the results. Label each axis with the quantity and unit. Choose a scale that shows the data clearly. If you describe a pattern, point to the relevant results rather than using vague words such as “a lot” or “a little.”

Separate recorded results from interpretations.
Include units and clear labels for measured values.
Report only the precision supported by the original measurements.

4. Build a conclusion from evidence

A conclusion answers the purpose or question of the investigation. State the main finding directly, then support it with relevant results. A strong conclusion explains how the evidence supports the claim. A claim is a statement about what the results show; evidence is the recorded information used to support it.

Do not treat a single observation as proof of an explanation that was not tested. Use careful wording. For example, “The results support the idea that…” may be more accurate than “The results prove…” when the evidence is limited. If the results do not clearly answer the question, say so and identify the limitation without inventing a cause.

A useful conclusion can also note a relevant source of uncertainty. A source of uncertainty is a factor that may affect how dependable or precise a result is, such as difficulty reading a scale. Mention only factors that apply to the actual investigation. Do not use a list of generic errors in place of explaining the results.

Before submitting, check that the procedure describes what was done, the results show what was recorded, and the conclusion answers the purpose using those results. These parts work together, but each has a different job.

Answer the investigation’s purpose.
Support the conclusion with specific recorded evidence.
Avoid claims stronger than the evidence allows.

Worked example

Turning a record into a clear report

A student is given this fictional record for practice: “Put liquid in a cup. It got cloudy. Maybe a solid formed.” The record does not include a measured amount, the liquid’s identity, or a time. Show how to improve the communication without inventing missing information.

Separate what is known
The record directly states that the liquid became cloudy. That is the observation. The possible formation of a solid is an interpretation, so it should be presented cautiously and not as a confirmed result.
Keep missing details visible
The record does not identify the liquid or give an amount or time. Do not add those details as if they were measured. In a real report, check the original notes or state that the information was not recorded.
Write a supported conclusion
A suitable practice conclusion can say that the liquid became cloudy and that this observation may be consistent with a solid forming. It should not claim that a solid definitely formed, because the record does not confirm that interpretation.

Answer: Observation: The liquid became cloudy. Interpretation: The cloudiness may be consistent with a solid forming, but the record does not confirm this. Procedure details such as the liquid’s identity, amount, and time are missing and must be checked in the original notes rather than guessed.

Check: The answer distinguishes observation from interpretation and does not invent procedure details or experimental evidence.

Common mistakes and how to avoid them

Writing “the reaction was successful” as the only result.

Correction: State what was actually observed or measured. Then explain what that evidence may show.

Leaving units off measurements.

Correction: Write the unit with each value or make the unit clear in the relevant table heading.

Adding a precise amount or time that was not recorded.

Correction: Check the original notes. If the information is unavailable, identify it as missing.

Putting explanations in the results as if they were direct observations.

Correction: Separate what was observed from the particle-level explanation or other interpretation.

Claiming that results prove more than they show.

Correction: Use cautious wording and connect each conclusion to specific evidence.

Lesson summary

A procedure tells what was done, in a clear and ordered way.
Results record observations and measurements; include labels and units where needed.
A conclusion answers the purpose and uses evidence from the results.
Distinguish direct observations from explanations and do not invent missing information.

Check your understanding

Question 1

A student writes, “The solution turned blue, so the particles changed.” Which part is a direct observation?

The solution turned blue.
The particles changed.
Both statements are direct observations.
Neither statement is an observation.

Show answer and explanation

The solution turned blue.

The colour change can be directly observed. The statement about particles is an interpretation.

Question 2

A table lists a measured volume as 12. Which change most improves the communication?

Add an appropriate unit, if it was recorded.
Change it to 12.00 to make it more exact.
Replace it with “a small amount.”
Remove the value because numbers are hard to read.

Show answer and explanation

Add an appropriate unit, if it was recorded.

A unit tells the reader what the value measures. Extra decimal places should not be added unless supported by the measurement.

Question 3

The procedure notes do not say how long a step took. What should the report writer do?

Choose a likely time and report it as measured.
Leave the gap hidden so the procedure seems complete.
Check the original record or state that the time was not recorded.
Replace the time with a conclusion.

Show answer and explanation

Check the original record or state that the time was not recorded.

A report must not invent details. Checking the original record may recover the information; otherwise, the missing detail should be identified.

Key terms

Observation: A record of something seen, heard, or measured.
Interpretation: An explanation of what an observation may mean.
Procedure: The ordered actions used in an investigation.
Results: The observations and measurements collected.
Conclusion: A statement that answers the investigation’s purpose using evidence.
Unit: A label that tells what a measured number represents.
Significant digits: The digits that communicate the precision of a measurement.

Continue through SCH3U

View the complete SCH3U Ontario Grade 11 Chemistry curriculum and lessons

About this lesson and its review

Published by DoAssignment. This AI-assisted lesson follows Ontario Grade 11 Chemistry (SCH3U), expectation A1.11. It is a study resource, not an official curriculum publication.

Before publication, the draft is checked for structure, mathematical or chemical notation, calculations, course boundaries, and readability, and then requires administrator approval. Errors can still occur, so corrections are welcomed.

Official curriculum reference

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