5 original questions from New Regents. The worksheet, answer key, and browser practice are free.
Reading an Equilibrium With a Total-Particle Sensor 5 questions
Reading an Equilibrium With a Total-Particle Sensor
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A reversible model converts particle A to particle B and back. One particle of A becomes one particle of B. At this temperature, the equilibrium state contains two B particles for every A particle. A broad sensor reports the combined count, while a color sensor counts B only.
| Time of reading | Combined sensor count | B-only sensor count |
|---|---|---|
| At the start | 90 | 30 |
| During the change | 90 | 48 |
| After the readings settle | 90 | 60 |
Question 1
Complete the response table with the number of A particles for each reading. Explain how the two sensors are used.
Write your answer and work on the printable worksheet, or answer online.
Question 2
Which reading first fits the stated equilibrium ratio?
- At the start
- During the change
- After the readings settle
- All three readings
Question 3
A student says the combined sensor proves the mixture was at equilibrium from the start. Evaluate the claim using both records.
Write your answer and work on the printable worksheet, or answer online.
After the mixture settles, a separator removes 30 B particles without removing any A. The temperature stays the same and the separator is then turned off.
Question 4
Predict the B-only sensor reading when the system settles again. Use the new total count.
Write your answer and work on the printable worksheet, or answer online.
Question 5
Explain what is happening to individual A and B particles once the new readings stay steady.
Write your answer and work on the printable worksheet, or answer online.
2025 Chemistry Reference Tables · Browse Chemistry worksheets