Prerequisite bridge, model and guided practice

Observation, evidence, explanation

Target: Explain a temperature pattern using observations and a scientific idea. Prerequisites: read headings/°C/time, subtract and identify warming/cooling. Follow one sample from its start to finish. An observation describes a supplied reading. Evidence is a relevant observation selected for a question. An explanation connects evidence to a scientific idea.

H is 100 g of water in a covered cup. All surroundings stay at 23°C. Covered liquid water; no active heating/cooling, ice, phase change, direct sunlight or meaningful evaporative cooling. Room, cup, lid and supporting surfaces are at the stated surrounding temperature; it stays constant. Readings represent the sample temperature with a consistent procedure. This is a paper scenario, not apparatus instructions.

Start and finish of one sample

Constructed teaching data: these values were invented for this activity, not collected in an experiment.

Sample	Start (°C)	After 10 min (°C)
H	13	17

1. Identify the sample and surroundings, their starting temperatures, the interval and the sample’s change.

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2. Classify these fictional statements: (a) H reads 17°C at 10 min; (b) I use 13→17°C to show warming; (c) energy transfers from warmer surroundings toward cooler water. Which adds a scientific explanation?

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Vocabulary: sample = the matter being studied; surroundings = parts outside that sample; net = overall transfer after transfers in opposite directions are considered. You may point, speak or draw.

Explain this record

Question: Why did the water’s temperature change during these 15 minutes? We are explaining one pattern, not choosing a winning sleeve.

One 100 g covered liquid-water sample begins at 12°C. Surroundings stay at 24°C. Covered liquid water; no active heating/cooling, ice, phase change, direct sunlight or meaningful evaporative cooling. Room, cup, lid and supporting surfaces are at the stated surrounding temperature; it stays constant. Readings represent the sample temperature with a consistent procedure. This is a paper scenario, not apparatus instructions.

Supplied water readings from one run

Constructed teaching data: these values were invented for this activity, not collected in an experiment.

Elapsed time (min)	Water (°C)
0	12
5	14
10	16
15	17

Fictional incomplete response: “It was 12°C at the start and 17°C at 15 minutes. It went up 5°C.”

1. Which part of this response describes the record? What explanatory connection is still missing?

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2. Use the warmer/cooler parts and net energy transfer to extend the answer. Include a limit.

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Model representation · Sample and surroundings

repeated:100 g water,12°C start→17°C at 15 min; all surroundings 24°C. This representation explains the record. Its arrow is a scientific model, not a thermometer observation.

Outer box: surroundings 24°C, including room, cup, lid and support. Inner box: liquid-water sample,100 g,12°C at start and 17°C at 15 min. One arrow points from surroundings toward water and is labeled net thermal-energy transfer. The arrow does not identify a pathway or show particles crossing.

Constructed teaching data: these values were invented for this activity, not collected in an experiment.

Outer box: surroundings 24°C, including room, cup, lid and support. Inner box: liquid-water sample,100 g,12°C at start and 17°C at 15 min. One arrow points from surroundings toward water and is labeled net thermal-energy transfer. The arrow does not identify a pathway or show particles crossing.

1. What is observed in the table? What does the representation add? Does it prove that only conduction occurred?

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The accompanying text describes every label and arrow. A diagram can show reasoning without a fixed paragraph format.

Guided practice · Explain a different record

One 100 g water sample begins at 37°C. Covered cup and other surroundings stay at 21°C. Covered liquid water; no active heating/cooling, ice, phase change, direct sunlight or meaningful evaporative cooling. Room, cup, lid and supporting surfaces are at the stated surrounding temperature; it stays constant. Readings represent the sample temperature with a consistent procedure. This is a paper scenario, not apparatus instructions.

One run, not four independent trials

Constructed teaching data: these values were invented for this activity, not collected in an experiment.

Elapsed time (min)	Water (°C)
0	37
5	34
10	32
15	30

1. Select two relevant readings and describe the size and direction of change.

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2. Name sample/surroundings and the direction of net thermal-energy transfer. Explain how that connects to the readings.

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3. Evaluate the fictional statement “The lower reading means a better sleeve.” What question are we answering, and what cannot this table establish?

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