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Study Guide/Notes - docs.google.com/document/d/1JAsmjtTg54DPJziJsVKuRnDFZVCHkgd7TA6P4FgbLug/edit?usp=sharing
Use the provided study guide to help you answer the review questions.
Do not use any other source - I have created the quiz directly from the material on the study guide.
This is a participation grade and it is designed to help you prepare for the quiz.
Use a "Ctrl+F" keyword search to help you find the information in the study guide.
You will have one-minute per question.
Study Guide/Notes - docs.google.com/document/d/1JAsmjtTg54DPJziJsVKuRnDFZVCHkgd7TA6P4FgbLug/edit?usp=sharing
Heat (Q): The energy transferred between substances due to a temperature difference. It can raise the temperature of a substance or cause a phase change.
Mass (m): The amount of substance being heated or cooled, measured in grams (g) or kilograms (kg).
Specific Heat (c): The amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius (°C). It varies for different materials.
Change in Temperature (ΔT): The difference between the final temperature (Tf) and the initial temperature (Ti) of the substance:
ΔT = Tf - Ti
Q = m ⋅ c ⋅ ΔT
Q = heat transferred (joules, J)
m = mass (grams or kilograms)
c = specific heat (J/g°C; J/kg°C; J/gK; J/kgK)
ΔT = change in temperature (°C or K)
Mass (m): 200 g
Specific Heat (c): 4.18 J/g°C
Initial Temperature (Ti): 25.0 °C
Final Temperature (Tf): 100.0 °C
ΔT = Tf - Ti → ΔT = 100 - 25 = 75oC
ΔT = 75oC
Q = m ⋅ c ⋅ ΔT
Q = 200 x 4.18 x 75
Q = 200 ⋅ 4.18 ⋅ 75.0 → Q = 62700 J
I. Core Concepts
A. Thermal Energy (TE)
1. Definition: total kinetic energy of all
moving particles in a substance
2. Key points
a. All matter has thermal energy
(even objects that feel cold)
b. TE depends on temperature
(average energy per particle) and
mass (number of particles - can be extended to volume)
3. Example: tub of warm water vs.
small pot of boiling soup
a. Soup: higher temperature (higher
average kinetic energy)
b. Tub: greater mass (more particles)
→ can have greater TE overall
B. Temperature
1. Definition: average kinetic energy of
particles in matter
2. Key points
a. Higher temperature → particles
move faster on average
b. Temperature determines how
warm/cool something feels
3. Example: person with fever —
thermometer measures raised average
particle energy.
C. Relationship: Thermal Energy vs.
Temperature vs. Mass
1. Temperature = average kinetic energy
per particle
2. Thermal energy = sum of kinetic
energies.
a. TE = (average energy) × (number
of particles related to mass)
3. Thought experiments
a. Large ice block could have more TE
than small pot of boiling water
if mass is much larger
b. Small hot object vs. large warm
object comparisons
II. Measurement of Temperature
A. Thermometers (liquid-in-glass)
1. Working principle: liquid expands when
warmer, contracts when cooler
2. Explanation: particle motion increases
spacing → liquid rises; decreases
→ liquid falls
B. Temperature Scales
1. Kelvin (SI)
a. Freezing point of water: 273 K
b. Boiling point of water: 373 K
c. Temperatures not given in
“degrees”
2. Celsius
a. Freezing point: 0 °C
b. Boiling point: 100 °C
3. Fahrenheit
a. Freezing point: 32 °F
b. Boiling point: 212 °F
4. Conversions
a. Celsius
Kelvin
i. K = °C + 273
ii. °C = K − 273
b. Celsius → Fahrenheit
i. °F = (°C × 1.8) + 32
c. Fahrenheit → Celsius
i. °C = (°F − 32) ÷ 1.8
5. Examples
a. 10 °C = 283 K and = 50 °F
b. 86 °F → (86 − 32) ÷ 1.8 = 30 °C
III. Heat (Energy Transfer)
A. Heat = transfer of thermal energy between
substances
B. Direction and mechanism
1. Thermal energy always moves from
warmer to cooler substances
2. Collisions: faster-moving particles
(those with higher kinetic energy)
transfer energy to slower-moving
particles (those with lower kinetic
energy) until equilibrium
C. Examples
1. Oven heating food: oven → food
2. Ice in cola: cola transfers thermal
energy to ice → ice melts; cola cools
IV. Specific Heat Capacity
A. Definition
1. Amount of energy required to raise one
mass unit of a substance by one
temperature unit
2. Units: J/kgK; J/g·K; J/gC; J/kgC
B. Importance
1. Property specific to each material
2. Explains different heating/cooling rates
of substances
C. Sample specific heat values (J/kgK)
1. Iron ≈ 450
2. Sand ≈ 670
3. Wood ≈ 1760
4. Water ≈ 4180
D. Applications & examples
1. Beach: sand heats quickly (low specific
heat) vs. water remains cooler
(high specific heat)
2. Cooking: metal pots heat quickly;
wooden handles safer due to higher
specific heat and lower conductivity
3. Hot tea vs. hot soup: soup often cools
more slowly because of higher
specific heat and/or greater mass
V. Vocabulary Summary
A. Thermal Energy: total kinetic energy of
particles
B. Temperature: average kinetic energy of
particles
C. Kinetic Energy: energy due to motion
D. Mass: amount of matter; affects total TE
E. Thermometer: device to measure
temperature (liquid expansion)
F. Specific Heat: energy per mass per degree
to raise temperature
G. Kelvin / Celsius / Fahrenheit: temperature
scales
Heat (Q) is best defined as:
Which variable in
In the formula
If a substance’s temperature increases, what happens to the value of
Which of the following equals
A student heats
Using
Which statement about thermal energy (
Temperature is defined as:
If two objects have the same temperature but different masses, which could be larger?
A tub of warm water and a small pot of boiling soup are compared. Which best explains why the tub could have more thermal energy?
Why does a thermometer’s liquid rise when warmed?
Which temperature scale does NOT use the word “degrees” when labeling temperatures?
Freezing and boiling points of water on the Celsius scale are:
Freezing and boiling points of water on the Fahrenheit scale are:
The Kelvin freezing point and boiling point of water are:
Convert
Convert
Which conversion formula is correct for Celsius to Fahrenheit?
Heat always flows:
What mechanism is described for heat transfer between particles?
When ice melts in cola, which direction is thermal energy transferred?
Specific heat capacity is:
Which of these is the SI unit commonly used for specific heat?
Which material from the list has the highest specific heat (per the given sample values)?
Given sample values in
Why does sand heat up more quickly than water on a sunny day?
Which example correctly shows an application of specific heat?
Which statement about kinetic energy (as defined in the vocabulary) is correct?
In the example calculation, how much heat is required to heat
In that example, what value was used for
Using
Which of the following is NOT a factor that affects thermal energy (
A small hot object and a large warm object are compared. Which of the following is true based on the core concepts?
If a temperature is given as
Which vocabulary match is correct?
Which of these best explains why a metal pot heats quickly?
A material has specific heat
Which of the following is a correct Fahrenheit → Celsius conversion formula from the document?
If a thermometer uses liquid expansion, what causes the liquid to expand as temperature rises?
Which of the following is true about temperatures on the Kelvin scale?
In a heat-transfer situation, equilibrium is reached when:
Given specific heats in
What does the specific heat tell us about a material?
Which example correctly matches the direction of heat flow?