Specific Heat and Heat Capacity

Grade 11 · Physics

Semester 2 | Period 4 | Week 20

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Subject: Physics

Semester: 2

Period: 4

Week: 20

School Name:

Teacher’s Name:

Subject: Physics

Grade Level: Grade 11

Week & Period: Week 20, Period IV

Date:

Sub-topic: Specific Heat and Heat Capacity

Learning Objectives:

By the end of the lesson, learners should be able to:

  1. Define specific heat capacity and heat capacity.
  2. Identify the SI units of both quantities.
  3. Solve problems involving heat capacity and specific heat capacity.
  4. Conduct and explain simple experiments to determine specific heat capacity.
  5. Distinguish between high and low specific heat capacities in everyday materials.

 

Previous Knowledge:

Learners have been introduced to the concept of heat, its unit (Joule), and its transfer.

 

Instructional Materials:

  • Calorimeter
  • Thermometer
  • Water
  • Weighing balance
  • Electrical heater or immersion coil
  • Stopwatch
  • Digital voltmeter and ammeter
  • Known metal samples (copper, iron, aluminum)
  • Stirring rod
  • Heatproof gloves

 

Anticipation (Warm-Up) – 5 minutes:

Ask:

  • “Why does water take longer to heat up than metal?”
  • “Which material gets hotter faster when heated under the same condition?”

 

Building Knowledge (Main Lesson) – 25 minutes:

 

Experiment: Determining the Specific Heat Capacity of a Metal

Title: Finding the specific heat capacity of aluminum using the method of mixtures.

Materials:

  • Calorimeter
  • Hot aluminum block (preheated)
  • Cold water (measured)
  • Thermometer
  • Balance scale
  • String or tongs

Procedure:

  1. Measure and record the mass of the cold water.
  2. Record its initial temperature.
  3. Heat aluminum block to a known high temperature.
  4. Transfer hot metal into cold water inside the calorimeter.
  5. Stir gently and record final equilibrium temperature.

 

 

Learners’ Activities:

  • Carry out specific heat experiment using method of mixtures.
  • Record values and compute results.
  • Compare the thermal response of water vs. metal to heat input.
  • Solve structured word problems in groups.

 

Consolidation (Review and Assessment) – 10 minutes:

Oral Questions:

  1. What does specific heat capacity depend on?
  2. Why is water used for cooling engines?
  3. Calculate the heat needed to raise 2kg of water from 30°C to 80°C.

 

Homework / Assignment:

  1. Define specific heat capacity and write its formula.
  2. A 1.5kg copper block is heated from 25°C to 75°C. Calculate the heat supplied. (c = 390 J/kg°C)
  3. Discuss how specific heat is used in cooking pots and car engines.

 

Expanded Notes / Instructions:

  • Use real-life comparisons like aluminum foil vs. water.
  • Clarify confusion between heat capacity (object-based) vs. specific heat (material-based).
  • Encourage accuracy in thermometer reading and timekeeping.

 

Inclusive / Differentiation:

  • Hands-on learners: conduct the calorimetry experiment
  • Struggling learners: use visual aids showing the Q = mcΔT triangle
  • Advanced learners: attempt electrical method to determine c (Q = IVt)

 

Teacher’s Reflection:

  • Did learners understand the concept and units?
  • Were they able to apply the formula correctly?
  • Was the experiment executed with minimal error?