FOCUSED REVIEW
Focused Review — Heat, Specific Heat, and Calorimetry — Foundational
Reinforce the highest-leverage ideas and representative problem-solving tools for Heat, Specific Heat, and Calorimetry.
TIME
Approximately 15 minutes
BEST FOR
Targeted reinforcement
FINISH WITH
A readiness check
After this focused review, you'll be able to...
reinforce the key relationships, apply them to representative problems, and identify what still needs work.
Choose how you want to review
Course Alignment
This Physics Sensei Unit Review is an independent learning resource. Use it to reinforce key concepts, prepare for homework, or review before a quiz or exam.
RESOURCE: Physics Sensei Unit Review | UNIT ID: THM-U03 | TOPIC: Heat, Specific Heat, and Calorimetry | COURSE LEVEL: Foundational Physics
BEST USED ✓ After learning the unit ✓ Before starting homework ✓ Before a quiz or exam
Your Review Plan
Complete these six stages in order. Each stage builds on the previous one and prepares you for the final readiness check.
6 Stages • Approximately 15 minutes.
Warm-Up Check
Before you begin, take a moment to see what you already remember. Do not worry about getting everything right. This is only a starting point.
ACTIVITY 1
Meaning Match
Work the prompt, then compare with the revealed answer.
Match each idea with its meaning.
Reveal Answers
Heat → energy transferred; specific heat → energy needed per kilogram per degree; calorimetry → using energy balance to study heat exchange.
Why it works: These three ideas organize nearly every calorimetry problem.
ACTIVITY 2
Sign Check
Work the prompt, then compare with the revealed answer.
State whether Q is positive or negative for each case.
Reveal Answers
An object warms: Q is positive. An object cools: Q is negative.
Why it works: The sign follows whether the object absorbs or releases energy.
ACTIVITY 3
Quick Calculation
Work the prompt, then compare with the revealed answer.
A 2.0 kg sample with c = 500 J/(kg·°C) warms by 3.0 °C. Find Q.
Reveal Answers
Q = (2.0)(500)(3.0) = 3000 J.
Why it works: Use Q = mcΔT and multiply mass, specific heat, and temperature change.
Ready to strengthen your understanding?
You've refreshed what you already know. Next, you'll reinforce the essential concepts that will help you solve problems with confidence. Need to see the learning path again?
Core Concepts
Reinforce the two highest-leverage relationships, then use them in representative situations.
KEY CONCEPT 1
Heat and Temperature Change
Heat is energy transferred because of a temperature difference. For a substance that stays in one phase, the energy needed for a temperature change depends on its mass, specific heat, and temperature change.
Q = mcΔT
Example: A larger mass or larger specific heat requires more energy for the same ΔT.
Sensei note: Do not treat heat and temperature as the same quantity. Heat is energy transfer; temperature describes thermal state.
KEY CONCEPT 2
Specific Heat
Specific heat c tells how much energy is needed to raise 1 kg of a material by 1 °C (or 1 K). Materials with larger c change temperature less for the same energy input per kilogram.
c = Q/(mΔT)
Example: Water has a large specific heat, so it warms and cools more slowly than many metals.
Sensei note: Use kilograms when c is in J/(kg·°C), and keep units consistent.
KEY CONCEPT 3
Calorimetry and Energy Balance
In an insulated calorimetry situation, energy released by warmer objects is absorbed by cooler objects. The total heat transfer for the chosen system is zero.
Qhot + Qcold = 0
Example: For two objects, heat lost by the warmer object equals heat gained by the cooler object in magnitude.
Sensei note: Choose signs from temperature change: warming gives ΔT > 0 and cooling gives ΔT < 0.
Ready to apply these ideas?
You've reinforced the essential concepts. Now it's time to put them into practice by working through guided examples and building your problem-solving confidence. Need a quick reminder?
Guided Practice
Apply the reinforced ideas to two representative situations, then use the strategy card to check your setup.
PRACTICE 1
Worked Example
Work the prompt, then compare with the revealed answer.
A 0.50 kg sample with c = 900 J/(kg·°C) warms from 20 °C to 30 °C. Find the heat absorbed.
Reveal Answers
ΔT = 10 °C. Q = mcΔT = (0.50)(900)(10) = 4500 J. The sample absorbs 4.5 kJ.
Why it works: A positive temperature change gives positive Q.
PRACTICE 2
Guided Problem
Work the prompt, then compare with the revealed answer.
A 0.20 kg object releases 2400 J while cooling by 20 °C. Find its specific heat.
Reveal Answers
Use |Q| = mc|ΔT|. c = 2400/[(0.20)(20)] = 600 J/(kg·°C).
Why it works: Using magnitudes is convenient when the problem asks only for c.
PRACTICE 3
Independent Problem
Work the prompt, then compare with the revealed answer.
Equal masses of two materials receive the same heat. Material A has twice the specific heat of B. Compare their temperature changes.
Reveal Answers
Because ΔT = Q/(mc), A changes temperature by half as much as B.
Why it works: For fixed Q and m, ΔT is inversely proportional to c.
Ready to check your understanding?
You've practiced the essential skills with guidance. Now it's time to solve a few short problems on your own and confirm you're ready to move forward. Need a quick reminder?
Confidence Check
You've rebuilt the key ideas and practiced them with guidance. Now try these short questions on your own to check your understanding before moving on.
QUICK CHECK 1
Heat or Temperature?
Work the prompt, then compare with the revealed answer.
Choose the correct statement about heat and temperature.
Reveal Answers
Heat is energy transferred between systems; temperature is not energy transferred.
Why it works: The quantities are related but not interchangeable.
QUICK CHECK 2
Use the Formula
Work the prompt, then compare with the revealed answer.
A 1.0 kg sample with c = 400 J/(kg·°C) gains 2000 J. Find ΔT.
Reveal Answers
ΔT = Q/(mc) = 2000/(1.0×400) = 5.0 °C.
Why it works: Rearrange Q = mcΔT.
QUICK CHECK 3
Energy Balance
Work the prompt, then compare with the revealed answer.
In an insulated cup, a hot object loses 600 J. How much heat does the cooler material gain?
Reveal Answers
It gains 600 J, so Qcold = +600 J.
Why it works: Energy conservation requires the transfers to be equal in magnitude and opposite in sign.
How did it go?
You've checked your understanding. Take one final look at the essential ideas before deciding what to do next. Need a quick reminder?
Summary
Before moving on, take one final look at the most important ideas from this review.
KEY TAKEAWAY 1
Core relation
For one substance with constant specific heat and no phase change, Q = mcΔT.
KEY TAKEAWAY 2
Thermal response
Large mass or large specific heat means a smaller temperature change for a given energy transfer.
KEY TAKEAWAY 3
Calorimetry balance
For an insulated system, add all heat transfers and set the total equal to zero.
Ready for your next step?
You've reviewed the essential ideas one last time. Now choose the resource that best matches how confident you feel. Need a quick reminder?
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