Parent plan · Week 7 · Phases of Matter — apply and extend — Physical Science: Matter, Forces & Energy

Units to teach or revisit

Chapter 2 · Phases of Matter

Assigned readings

Ice melts, but a cold cup gets wetter

Chapter 2 continues one explanation across five smaller units. Questions from the launch should remain active as new evidence is added.

This week’s goals

Explain the assigned questions using named mechanisms and relevant records.
Read the labeled figures and distinguish observations from inferences.
Revise an explanation after checking its evidence and assumptions.

Read the chapter launch and assigned unit sections on their linked lesson pages. Keep the launch model and return to it after each new evidence comparison.

Five flexible sessions of about 40–45 minutes. Formal papers may join consecutive sessions; take the stated total exam time. Slow down and replace a flex task with reteaching when evidence of understanding is incomplete.

Session 1 · Evaporation, Condensation & a Wet Cold Cup — connect and test

When vapor contacts a sufficiently cool surface, energy transfer can favor liquid droplets. Humidity describes the water vapor in air; relative humidity compares the amount present with the saturation amount at that temperature. The dew point is the temperature at which air reaches saturation on cooling under the specified conditions.

Your task

Study Parts 3–4. Answer both checkpoints and the figure question, then work the whole-unit application with intermediate steps. Use the labeled figures and “Read the visual model” question in the assigned part; explain an attempted answer before opening guidance.

Read Parts 3–4 in manageable sections.
Name the graph axes, quantities or receivers in the figure.
Attempt the application before reading its model.
Check reasoning, units and the case assumptions.

Hint and response guidance

Use the assigned unit’s figures, captions and worked examples. Identify conditions and units before choosing a relationship.

The 8 °C surface is below the supplied 12 °C dew point; the 18 °C surface is above it. The prediction depends on those air conditions. Area, illumination and possibly temperature differ. A comparison changing only intended area is needed to isolate its effect.

Use the specified quantities and units.
Explain an intermediate step or comparison.
Connect the pattern to the physical mechanism.
State an assumption or limitation.

Session 2 · Evaporation, Condensation & a Wet Cold Cup — practise and revise

Illustrative records show a cold intact cup with clear outside droplets. An open tray loses 6 g while a covered matched tray loses 1 g in an hour.

Your task

Study the worked examples, complete the unit practice and retrieval questions, then return to the phenomenon and explain the model change. Complete the exit check; use the sustained tasks for additional depth or a needed correction. Use the labeled figures and “Read the visual model” question in the assigned part; explain an attempted answer before opening guidance. Complete the new illustrated practice and independent visual-transfer case for this unit.

Explain a worked example with the answer covered.
Attempt independent questions and record reasoning.
Use feedback to correct a specific error.
Revise the initial model and answer the exit check without notes.

Hint and response guidance

Use the assigned unit’s figures, captions and worked examples. Identify conditions and units before choosing a relationship.

The droplets can be condensed water from surrounding air; the tray loss can be water evaporating into that air. The open tray loses 5 g more under the stated comparison. Covering changes exchange and can also change temperature or airflow, so the result does not isolate every mechanism. Neither observation requires water creation or destruction.

Use the supplied evidence.
Explain a mechanism or calculation.
Correct rather than erase an error.
Identify a limit or remaining question.

Session 3 · Heating Curves & Energy During Phase Change — observe and build

Illustrative evidence case. Illustrative ice–water data remain near 0 °C for four minutes while a heater supplies 100 J each minute. The unit’s visible language notes define the scientific words before the main reading.

Your task

Make the first model, read the core explanation and Parts 1–2, then answer their reasoning checks. Describe the associated figure using labels and caption. Use the labeled figures and “Read the visual model” question in the assigned part; explain an attempted answer before opening guidance.

List two observations and one question.
Sketch an initial explanation before opening guidance.
Read the language notes and explain Parts 1–2 in plain words.
Attempt both checkpoints; discuss and revise.

Hint and response guidance

Use the assigned unit’s figures, captions and worked examples. Identify conditions and units before choosing a relationship.

Temperature at recorded times. A constant-rate assumption connects time with energy input; the graph does not directly measure every energy pathway. No. They vibrate in the solid. Warming changes their motion; melting later changes the larger arrangement and freedom to move.

Keep observations distinct from causes.
Use the defined terms correctly.
Connect the model to stated evidence.

Session 4 · Heating Curves & Energy During Phase Change — connect and test

During melting at the modeled pressure, energy supports changes in particle arrangement and interactions while solid and liquid coexist. The approximately steady temperature does not mean energy input stops. Latent heat is the energy per amount of substance associated with a phase change without the corresponding temperature rise.

Your task

Read Parts 3–4 in manageable sections.
Name the graph axes, quantities or receivers in the figure.
Attempt the application before reading its model.
Check reasoning, units and the case assumptions.

Hint and response guidance

Use the assigned unit’s figures, captions and worked examples. Identify conditions and units before choosing a relationship.

A decreasing solid fraction and increasing liquid fraction while energy is supplied. Temperature alone is insufficient to describe the complete state. No. Pure ice, a solid–liquid mixture or liquid at that temperature may be possible under the stated conditions; additional state evidence is needed.

Use the specified quantities and units.
Explain an intermediate step or comparison.
Connect the pattern to the physical mechanism.
State an assumption or limitation.

Session 5 · Heating Curves & Energy During Phase Change — practise and revise

Illustrative ice–water data remain near 0 °C for four minutes while a heater supplies 100 J each minute.

Your task

Explain a worked example with the answer covered.
Attempt independent questions and record reasoning.
Use feedback to correct a specific error.
Revise the initial model and answer the exit check without notes.

Hint and response guidance

Use the assigned unit’s figures, captions and worked examples. Identify conditions and units before choosing a relationship.

400 J enters during the four-minute interval. In the simplified model it supports melting and changed particle interactions while the temperature stays approximately constant. It is not missing energy. Some real input can also reach the container or surroundings, so attributing all 400 J to the sample requires an idealized boundary and negligible losses.

Use the supplied evidence.
Explain a mechanism or calculation.
Correct rather than erase an error.
Identify a limit or remaining question.

Submit this week

Dated notebook entries and the assigned evidence or graph work.
An attempted model, revised model and the evidence behind the change.
Practice corrections or a human-reviewed assessment, as assigned.

Parent / teacher weekly conference

Start with the learner’s own explanation. Ask which record supports each claim, and which condition could change it. Check units, graph axes and model limits. Use supplied data without claiming it was experimentally measured at home. An oral explanation or accessible drawing can substitute for extended prose when it shows the same reasoning.

Can the learner explain the core mechanism without copying?
Can they read the new figure and identify a limit?
Which error needs a different explanation or worked example next session?

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