End of Chapter Exam
Chapter 2: Thermal Physics
15 Questions • High Stakes Assessment • 200 XP Available
Potential XP
200
Exam Instructions
- • Answer ALL 15 questions (5 Core, 5 Supplement, 5 Extended)
- • Check each answer individually for immediate feedback
- • Submit your complete exam when finished to receive your XP
- • Passing Score: 80% (12/15) for full XP
1CoreStates of Matter
Which statement correctly describes the arrangement and motion of particles in a solid?
2CoreStates of Matter
Which change of state requires energy to be supplied to break bonds between particles?
3SupplementBrownian Motion
Smoke particles in air exhibit random motion when viewed under a microscope. What causes this random motion?
4SupplementBrownian Motion
When observing Brownian motion of pollen grains in water, what would happen if the water temperature is increased?
5CoreThermal Expansion
Which of the following correctly orders materials from greatest to least thermal expansion?
6SupplementThermal Expansion
Railway tracks are laid with small gaps between sections. Why is this necessary?
7SupplementPressure & Gas Laws
Gas molecules in a container exert pressure on the walls. What is the mechanism that creates this pressure?
8ExtendedPressure & Gas Laws
A sealed syringe contains 60 cm³ of air at atmospheric pressure (100 kPa). If the plunger is pushed to reduce the volume to 20 cm³ at constant temperature, what is the new pressure?
9ExtendedPressure & Gas Laws
A fixed mass of gas is heated at constant volume. Which statement explains why the pressure increases?
10ExtendedSpecific Heat Capacity
The specific heat capacity of water is 4200 J/(kg·°C). How much energy is needed to raise the temperature of 2.0 kg of water from 20°C to 80°C?
11SupplementSpecific Heat Capacity
A block of metal with mass 0.5 kg requires 6300 J of energy to increase its temperature by 30°C. What is the specific heat capacity of the metal?
12CoreSpecific Heat Capacity
What is the definition of specific heat capacity?
13SupplementPhase Changes
The graph shows temperature vs heat for ice being heated to become steam. During the horizontal sections (flat lines), what happens to the energy being supplied?
Temperature-Heat graph for water (ice → liquid → steam)
14ExtendedPhase Changes
At which labeled point on the graph does the substance exist in TWO states simultaneously?
Temperature-Heat graph for water (ice → liquid → steam)
15ExtendedPhase Changes
When water evaporates from your skin, you feel cooler. Which statement correctly explains this cooling effect?
XP Grading Scale
80-100% (12-15 correct):200 XP
60-79% (9-11 correct):150 XP
40-59% (6-8 correct):100 XP
Below 40% (0-5 correct):50 XP
⚠️ Critical Exam Tips (Avoid These Traps!)
- •Temperature vs Energy: During phase changes, temperature stays constant even though energy is being added (energy breaks bonds, not increases KE)
- •Δθ Mistake: In E = mcΔθ, use CHANGE in temperature (final - initial), not just the final temperature
- •Brownian Motion: The random motion is caused by invisible molecule collisions, not visible particle collisions
- •Expansion Order: Always Gas > Liquid > Solid (think about particle spacing and forces)
- •Pressure Mechanism: Pressure comes from particle collisions with walls, creating force per unit area
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