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Reading a Reaction Pause From Two Curves 4 questions

Reading a Reaction Pause From Two Curves

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A display models a liquid reacting with a solid surface to make a product. Both runs have equal amounts of each reactant and the same temperature. In the model, liquid must touch the solid for the reaction to occur. The graph shows the total product formed over time.

At 0, 10, 20, 30, 40, and 50 seconds, reference P has formed 0, 10, 20, 30, 40, and 50 units. Test Q has formed 0, 10, 10, 10, 20, and 30 units.
Cumulative product for a reference run and a test run.
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Question 1

During which interval does Q form no additional product while P keeps forming product?

  1. 0 to 10 s
  2. 10 to 30 s
  3. 30 to 40 s
  4. 40 to 50 s

Question 2

Compare Q’s average product formation rates from 0 to 10 s and from 30 to 50 s.

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Question 3

A student says Q’s flat interval proves that it used up a reactant. Evaluate the claim using the later readings. No reactant is added during the run.

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The class can insert a model cover that prevents liquid from touching the solid while the cover is in place. Removing the cover exposes the same solid surface again.

Question 4

Compare two trials that differ only in use of the cover. State when to put the cover on and remove it, and what graph pattern would support interrupted contact.

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