thermodynamics unit test pdf high school

📚 Quick Study Guide

• 🌡️ Temperature Scales: Know your conversions! $Celsius = \frac{5}{9}(Fahrenheit - 32)$, $Kelvin = Celsius + 273.15$
• 🔥 Heat: Energy transfer due to temperature difference. $Q = mc\Delta T$, where $Q$ is heat, $m$ is mass, $c$ is specific heat, and $\Delta T$ is the change in temperature.
• ⚙️ First Law of Thermodynamics: $\Delta U = Q - W$, where $\Delta U$ is the change in internal energy, $Q$ is heat added to the system, and $W$ is work done by the system.
• 🔄 Thermodynamic Processes: Isothermal (constant temperature), Adiabatic (no heat transfer), Isobaric (constant pressure), Isochoric (constant volume).
• 💨 Second Law of Thermodynamics: Entropy ($\Delta S$) of an isolated system always increases. Heat cannot spontaneously flow from a cold reservoir to a hot reservoir.
• 📈 Efficiency: The ratio of useful work output to energy input. $Efficiency = \frac{Work Output}{Energy Input}$. For a Carnot engine: $Efficiency = 1 - \frac{T_c}{T_h}$, where $T_c$ is the cold reservoir temperature and $T_h$ is the hot reservoir temperature.

🧪 Practice Quiz

1. Which of the following is an example of an adiabatic process?
   1. A. Boiling water in a kettle
   2. B. Ice melting in a glass
   3. C. Rapid expansion of gas in an insulated container
   4. D. Heating a metal rod
2. What is the change in internal energy of a system if 500 J of heat is added and 300 J of work is done by the system?
   1. A. 200 J
   2. B. 300 J
   3. C. 500 J
   4. D. 800 J
3. A 2 kg metal block absorbs 1000 J of heat and its temperature rises by 5°C. What is the specific heat capacity of the metal?
   1. A. 100 J/kg°C
   2. B. 200 J/kg°C
   3. C. 400 J/kg°C
   4. D. 1000 J/kg°C
4. Which law of thermodynamics states that the entropy of an isolated system always increases or remains constant?
   1. A. Zeroth Law
   2. B. First Law
   3. C. Second Law
   4. D. Third Law
5. What is the efficiency of a Carnot engine operating between temperatures of 500 K and 300 K?
   1. A. 20%
   2. B. 40%
   3. C. 60%
   4. D. 80%
6. In an isobaric process, what remains constant?
   1. A. Volume
   2. B. Temperature
   3. C. Pressure
   4. D. Internal Energy
7. Convert 25°C to Kelvin.
   1. A. 248.15 K
   2. B. 273.15 K
   3. C. 298.15 K
   4. D. 323.15 K