8 original questions from New Regents. The worksheet, answer key, and browser practice are free.

Temperature and Equilibrium 4 questions

Temperature and Equilibrium

New Regents original practice • Name: ____________________ Date: __________ Show your work for written answers.

In this model, A ⇌ B + heat represents an exothermic forward reaction. The reverse reaction absorbs heat.

Question 1

Which direction absorbs heat in the model?

  1. Forward
  2. Reverse
  3. Both directions release heat.
  4. Neither direction involves heat.

Question 2

The model starts at equilibrium. Explain why warming favors net formation of A until a new equilibrium is reached.

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Question 3

Which change favors net production of B in the model?

  1. Increase temperature.
  2. Decrease temperature.
  3. Keep every condition the same.
  4. Stop counting particles.

Question 4

After a temperature change, how do the forward and reverse rates compare once the system reaches equilibrium again?

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Comparing Equilibrium Compositions 4 questions

Comparing Equilibrium Compositions

Use the information below to answer the questions.

A sealed model contains A and B with the same total particle count in every run. It follows A ⇌ B + heat. The table gives particle counts after equilibrium is reached at each temperature.

Temperature (K)A particlesB particles
3002080
3503565
4005050

Question 5

At which listed temperature is the equilibrium count of B greatest?

  1. 300 K
  2. 350 K
  3. 400 K
  4. It is equal at all three.

Question 6

Calculate the change in the equilibrium count of B from 300 K to 400 K. Include the sign.

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Question 7

Which is the highest listed temperature that still leaves at least 65 B particles?

  1. 300 K
  2. 350 K
  3. 400 K
  4. No temperature meets the requirement.

Question 8

Use the model and the measured counts to explain which net direction warming favors.

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