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A1.2 · Choose appropriate investigation equipment and materials

Learn to choose appropriate investigation equipment and materials through clear examples and targeted practice.

Ontario Grade 10 Science

Scientific Investigation and Careers

A practical guide to matching tools to the question

Suppose you want to compare how quickly two ice cubes melt. A timer can help you track time, and a thermometer can help you compare temperature. A ruler would not answer either question well. Choosing tools is not about selecting the most complicated equipment. It is about selecting what gives useful evidence for the question. This lesson focuses on that choice. It does not ask you to carry out a particular experiment.

What you will learn

Identify what an investigation needs to observe or measure before choosing equipment.
Choose equipment and materials that fit a question, are suitable for the task, and can be used safely.
Explain why a proposed tool or material is a good choice, or why it should be replaced.

1. Begin with the question

In Grade 9, you learned to observe and compare things. An observation is information gathered using your senses or a tool. Some observations describe qualities, such as whether a surface looks shiny. Other observations use numbers, such as a temperature reading. A measurement is an observation made with a measuring tool and recorded using a number and a unit.

Before selecting equipment, decide what you need to find out. Ask: What will I observe or measure? What materials must be present? What conditions need to be kept similar so the comparison is fair? These questions help narrow the choices.

For an investigation about the melting of ice, the question might focus on melting time or on temperature. Those are different things to measure, so they call for different tools. A tool is appropriate when it can provide evidence that is relevant to the question and can be used for the task.

Start with the question, not with a favourite piece of equipment.
Name the observation or measurement needed.
Choose tools that can provide relevant evidence.

2. Match the tool to the evidence

Equipment means the tools used to observe, measure, or handle materials. Materials are the substances or objects involved in an investigation. For example, a thermometer is equipment; water or an ice cube is a material.

A thermometer is suitable when the question involves temperature. A timer is suitable when it involves elapsed time. A balance is suitable when it involves mass. A ruler is suitable when it involves length. The tool must also suit the size and nature of the object or sample. If you need to observe a small detail, a tool that makes the detail easier to see may be more useful than unaided vision.

A measuring tool should have markings that let you record the needed information clearly. Consider whether its range—the lowest to highest values it can show—fits what you expect to observe. Also consider whether its scale, or spacing of marks, is suitable for making the comparison. You do not need the most finely marked tool if the question only needs a broad comparison.

Materials also need to fit the question. If you are comparing two conditions, you need materials that allow a meaningful comparison. For instance, comparing two ice cubes of very different sizes could make it harder to decide whether a difference in melting time was linked to the condition being studied. The choice of material affects how useful the evidence will be.

Match the tool’s purpose to the information needed.
Check that the tool’s range and markings fit the task.
Select materials that make the intended comparison meaningful.

3. Use a selection model

A simple selection model is: question, evidence, tool or material, reason. First state the question. Next name the evidence needed. Then identify a tool or material that can provide it. Finally, explain why that choice fits.

Use this model to assess a choice, not just to name an object. Saying “use a thermometer” is incomplete if you do not say what it measures or why temperature matters to the question. A clear reason connects the question to the evidence and the tool.

The table gives common matches. These are examples, not a fixed list for every investigation. The question and the sample determine what is appropriate.

Explain the connection between the question, evidence, and tool.
A tool can be available but still be unsuitable for a particular question.
Check the material as well as the equipment.

4. Check usefulness and safety

Before choosing equipment or materials, check whether they can be used safely and sensibly in the setting. Follow the teacher’s instructions and any safety directions for the materials. Wear required protective equipment, such as safety glasses, when instructed. Do not handle, taste, or smell materials unless the instructions specifically say how to do so safely.

A safe choice is not automatically a useful choice. A ruler may be safe, but it will not measure temperature. A useful tool may still be a poor choice if it is damaged, difficult to read, or not approved for the activity. Consider both suitability and safe use.

Evidence is more useful when the equipment and materials are chosen before observations begin. If a tool cannot answer the question, the recorded information may not help with the comparison. If you notice that a tool does not fit the task, explain the problem and choose a more suitable option with the teacher’s guidance.

Check both relevance and safe use.
Follow the teacher’s directions and material-specific safety instructions.
Replace a poor choice before relying on its observations.

Question-to-tool matches

Question involves	Possible equipment	Reason
Elapsed time	Timer	It records time passing.
Temperature	Thermometer	It provides temperature readings.
Mass	Balance	It measures mass.
Length	Ruler	It measures length.
Small visual details	Suitable magnifier	It can make details easier to observe.

Worked example

Choosing a tool to compare melting time

A class plans to compare how long two similar ice cubes take to melt under two approved classroom conditions. Which equipment and materials would help answer the question? Explain why.

Name the evidence
The question asks how long melting takes. The needed evidence is elapsed time, not the mass or length of the cubes.
Select suitable equipment
A timer can measure elapsed time. Two similar ice cubes and two suitable containers provide materials for the comparison. The cubes should be similar so a major difference in starting size is less likely to affect the comparison.
Explain the choice
The timer directly provides the kind of evidence named in the question. A ruler would not show how much time has passed. The class should use only conditions and materials approved by the teacher.

Answer: Use a timer, two similar ice cubes, and suitable containers. The timer provides evidence about melting time, while similar cubes support a clearer comparison.

Check: Would a thermometer alone answer a question about which cube took longer to melt? No. It measures temperature, not elapsed time.

Worked example

Choosing equipment for a temperature question

A hypothetical classroom plan asks whether the temperature of a sample changes during an approved observation period. The student suggests using a ruler and a thermometer. Which tool is relevant, and what should the student check before choosing it?

Connect the question to evidence
The question is about a possible temperature change. Temperature readings are the evidence needed, so a thermometer is relevant.
Assess the suggested tools
A ruler measures length, so it does not provide the requested temperature evidence. Before selecting a thermometer, check that it is approved for the activity, can be used safely, and has markings and a range suited to the expected sample temperature.
State the decision
Choose the suitable thermometer rather than the ruler. The plan should also follow the teacher’s directions for handling the sample and thermometer.

Answer: The thermometer is relevant because the question concerns temperature. The ruler is not. Check the thermometer’s suitability, markings, range, and safe use before selecting it.

Check: The example is hypothetical; it does not report or predict a measured temperature.

Worked example

Improving a material choice

A student wants to compare how quickly two equal amounts of water cool in two approved classroom locations. The student proposes one large container and one small container. Identify the problem with this material choice and suggest an improvement.

Check whether the materials support a fair comparison
The containers differ in size. That difference could affect the comparison, so it may be difficult to connect a difference in cooling to the locations alone.
Improve the choice
Use two similar, teacher-approved containers and equal amounts of water. This makes the materials more alike while the locations remain the feature being compared.
Match equipment to the question
Because the question concerns cooling, a suitable thermometer can provide temperature evidence. A timer can help record when observations are made. Use both only as directed by the teacher.

Answer: Use similar containers and equal amounts of water so the materials do not introduce an obvious difference unrelated to the locations. A suitable thermometer and timer can provide relevant temperature and time information.

Check: This is a planning example, not a report of measured cooling results.

Common mistakes and how to avoid them

Choosing a tool because it is familiar or available, without checking the question.

Correction: First identify the evidence needed. Then choose a tool that can provide it.

Naming equipment without explaining its purpose.

Correction: State what the tool measures or helps you observe and how that evidence relates to the question.

Ignoring the materials when judging a plan.

Correction: Check whether the materials support a useful comparison. Similar materials can reduce differences that distract from the question.

Assuming that a safe tool is automatically appropriate.

Correction: Check safety and usefulness separately. The tool must be safe to use and suitable for the evidence needed.

Lesson summary

Begin with the investigation question and identify the evidence it needs.
Choose equipment that can provide that evidence and fits the task.
Choose materials that make the intended observation or comparison meaningful.
Explain your choices and follow the teacher’s safety directions.

Check your understanding

Question 1

A student asks how long a process takes. Which tool is the most directly relevant?

A ruler
A timer
A balance
A magnifier

Show answer and explanation

A timer

A timer records elapsed time, which matches the question.

Question 2

A plan compares two samples, but one sample is much larger than the other. What is the best first response?

Ignore the difference because the samples are both materials.
Replace every tool with a more complicated one.
Consider using more similar samples so the comparison is clearer.
Use a ruler even if the question is about temperature.

Show answer and explanation

Consider using more similar samples so the comparison is clearer.

A large difference in sample size may affect the comparison. More similar samples can make the evidence easier to interpret.

Question 3

Which explanation best supports choosing a thermometer?

It is the tool nearest to the sample.
It measures temperature, which is the evidence the question needs.
It can replace every other tool.
It is always safe to use in any situation.

Show answer and explanation

It measures temperature, which is the evidence the question needs.

A good reason connects the tool’s purpose to the evidence needed. A thermometer is not automatically suitable or safe in every situation.

Key terms

Observation: Information gathered using the senses or a tool.
Measurement: An observation made with a measuring tool and recorded using a number and a unit.
Equipment: Tools used to observe, measure, or handle materials.
Materials: The substances or objects involved in an investigation.
Range: The lowest to highest values a measuring tool can show.
Scale: The marks or divisions on a measuring tool that show values.

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About this lesson and its review

Published by DoAssignment. This reviewed lesson follows Ontario Grade 10 Science (SNC2D), expectation A1.2. 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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