Parent plan · Week 26 · Chemical Energy & Thermodynamics — launch — Physical Science: Chemistry
Parent teaching plan · 36 weeksUnits to teach or revisit
Chapter 9 · Chemical Energy & Thermodynamics
- Unit 9.1 · Energy in Chemical Reactions
- Unit 9.2 · Calorimetry, Hess’s Law & Enthalpy Calculations
- Unit 9.3 · Entropy, Free Energy & Reaction Feasibility
Assigned readings
Develop this chapter question: Where does reaction energy go, and what favors change?
This week’s goals
- Explain models, species, arrows and axes before substituting values.
- Conserve the relevant atoms, charge, amount and energy account.
- Apply independently, state limits and revise from evidence.
Read A warmer cup does not mean every energy change is positive at chapter launch and revisit it alongside this week’s linked units, figures and investigation.
Five flexible sessions, normally 50–60 minutes. Two core unit sessions are scheduled, with a third for selected demanding topics. Sample week uses a complete 90-minute paper plus about 30 minutes of corrections within two ordinary-hour equivalents.
Session 1 · Energy in Chemical Reactions — build the model
Use the linked chapter reading, unit explanations, figures and notebook.
Your task
Read the chapter background and unit language. Draw a first model, study the core explanation and Parts 1–2, trace each figure and attempt the visual questions/checks. Complete a first worked case with its answer covered.
- Prepare the assigned explanation and identify the question.
- Trace a model or graph, labeling its species and units.
- Attempt the assigned reasoning and calculation before opening guidance.
- Compare with criteria and retain an explained correction.
Hint and response guidance
Name the species, quantities, boundary and assumptions before choosing a relationship. Use the matching figure to check each step.
Negative under the stated convention. The surroundings receive positive heat from that transfer. The 650 kJ released in the modeled product formation exceeds the 500 kJ input, giving −150 kJ for the full account.
- Use the supplied evidence and correct species/units.
- Explain the relevant mechanism or relationship.
- Show intermediate working or a labeled model.
- State an assumption, limitation or useful next test.
Session 2 · Energy in Chemical Reactions — apply and explain
Use the linked chapter reading, unit explanations, figures and notebook.
Your task
Study Parts 3–4 and selected source-model prompts, then attempt the whole-unit application, illustrated practice and changed independent case. Explain a correction, revise the opening model and complete the exit check.
- Prepare the assigned explanation and identify the question.
- Trace a model or graph, labeling its species and units.
- Attempt the assigned reasoning and calculation before opening guidance.
- Compare with criteria and retain an explained correction.
Hint and response guidance
Name the species, quantities, boundary and assumptions before choosing a relationship. Use the matching figure to check each step.
ΔH≈720−880=−160 kJ for the selected equation amount. Doubling all coefficients gives approximately −320 kJ. Average bond energies are an approximate full-reaction estimate, not proof about spontaneity or rate.
- Use the supplied evidence and correct species/units.
- Explain the relevant mechanism or relationship.
- Show intermediate working or a labeled model.
- State an assumption, limitation or useful next test.
Session 3 · Calorimetry, Hess’s Law & Enthalpy Calculations — build the model
Use the linked chapter reading, unit explanations, figures and notebook.
Your task
Read the chapter background and unit language. Draw a first model, study the core explanation and Parts 1–2, trace each figure and attempt the visual questions/checks. Complete a first worked case with its answer covered.
- Prepare the assigned explanation and identify the question.
- Trace a model or graph, labeling its species and units.
- Attempt the assigned reasoning and calculation before opening guidance.
- Compare with criteria and retain an explained correction.
Hint and response guidance
Name the species, quantities, boundary and assumptions before choosing a relationship. Use the matching figure to check each step.
Its heat-capacity contribution, such as CcalΔT, belongs in the surroundings account, along with relevant losses. Only part of that excess may react; normalization must use the actual extent or the specified reacting amount.
- Use the supplied evidence and correct species/units.
- Explain the relevant mechanism or relationship.
- Show intermediate working or a labeled model.
- State an assumption, limitation or useful next test.
Session 4 · Calorimetry, Hess’s Law & Enthalpy Calculations — apply and explain
Use the linked chapter reading, unit explanations, figures and notebook.
Your task
Study Parts 3–4 and selected source-model prompts, then attempt the whole-unit application, illustrated practice and changed independent case. Explain a correction, revise the opening model and complete the exit check.
- Prepare the assigned explanation and identify the question.
- Trace a model or graph, labeling its species and units.
- Attempt the assigned reasoning and calculation before opening guidance.
- Compare with criteria and retain an explained correction.
Hint and response guidance
Name the species, quantities, boundary and assumptions before choosing a relationship. Use the matching figure to check each step.
qwater=50.0×4.18×8.00=1672 J. qreaction≈−1.672 kJ. Dividing by 0.0200 mol gives approximately −83.6 kJ/mol on the specified reacting-amount basis, subject to the neglected terms.
- Use the supplied evidence and correct species/units.
- Explain the relevant mechanism or relationship.
- Show intermediate working or a labeled model.
- State an assumption, limitation or useful next test.
Session 5 · Entropy, Free Energy & Reaction Feasibility — build the model
Use the linked chapter reading, unit explanations, figures and notebook.
Your task
Read the chapter background and unit language. Draw a first model, study the core explanation and Parts 1–2, trace each figure and attempt the visual questions/checks. Complete a first worked case with its answer covered.
- Prepare the assigned explanation and identify the question.
- Trace a model or graph, labeling its species and units.
- Attempt the assigned reasoning and calculation before opening guidance.
- Compare with criteria and retain an explained correction.
Hint and response guidance
Name the species, quantities, boundary and assumptions before choosing a relationship. Use the matching figure to check each step.
The relevant energy, constraints and accessible microstate model are not specified quantitatively. Appearance alone is insufficient. The positive entropy contribution TΔS=30.0 kJ/mol exceeds the 20.0 kJ/mol enthalpy cost.
- Use the supplied evidence and correct species/units.
- Explain the relevant mechanism or relationship.
- Show intermediate working or a labeled model.
- State an assumption, limitation or useful next test.
Submit this week
- Labeled first/revised models and intermediate calculations.
- Assigned practice and assessed attempts with explained corrections.
- Investigation record/report when assigned, identifying supplied versus collected data.
Parent / teacher weekly conference
Use actual written work to adjust support. Do not count a copied solution as independent mastery. Extend or redistribute time where needed; home-study records do not certify supervised or mandated laboratory requirements.
- Can each relevant symbol and unit be explained?
- Does the calculation conserve the appropriate quantities?
- Can the learner solve a changed case and explain an assumption?