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Grade 11 Reaction Rate Data Interpretation

Revision activities / Chemistry study practice

Learning focus: Physical Chemistry. This original Grade 11 Chemistry exercise gives you a task, a suggested response and a follow-up challenge. It is classroom practice, not an official assessment paper.

Understand the idea

Rate describes change in a measured quantity per unit time. Comparisons require the same reaction amount and a clearly defined endpoint or interval.

Try the activity

Two trials produce 40 cm³ of gas in 20 s and 40 s respectively. Calculate the average rate for each and identify the faster trial.

Attempt your response before opening the guidance. Show the steps, textual evidence or reasons that support your answer; a final answer alone may hide a misunderstanding.

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Self-assessment checklist

This is your own assessment, not automatic marking.

Self-assessed checklist: 0/4

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Show suggested answer and reasoning

Average rates are 40 ÷ 20 = 2 cm³/s and 40 ÷ 40 = 1 cm³/s. The first trial is faster over the stated interval. These averages do not show how the instantaneous rate changes during either reaction.

Follow-up challenge

Sketch possible gas-volume curves and label axes with units. List controlled variables needed before attributing a difference to temperature. Use supplied data rather than attempting unsupervised reactions.

Review your work

  • Did you answer the question actually asked?
  • Can you explain the method or evidence in your own words?
  • What would you change if one condition in the task changed?

Use the suggested response to identify one correction, then attempt the task again without copying it. For an open-ended question, other well-supported answers may be reasonable. Ask your teacher to check interpretations or language forms where needed.

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Match this activity to the learning outcomes and sequence in your school’s current Grade 11 curriculum-design collection. This activity is a focused learning example, not a complete curriculum map.