Controlling reactions

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Question 21
Medium

A student reacts dilute hydrochloric acid with different forms of zinc to produce hydrogen gas.

  • The student repeats the experiment with different particle sizes of zinc: large pieces, medium granules, and fine powder.
  • They use exactly 5 g5\text{ g}5 g of zinc in each experiment, with the acid in excess.

The graph shows the student's results:

A graph plotting the volume of hydrogen gas in cubic centimeters on the vertical y-axis against time in seconds on the horizontal x-axis. There are four curves starting from the origin, labeled W, X, Y, and Z. Curve W is very steep and levels off at a high final volume. Curves X, Y, and Z all level off at the same, lower final volume. Curve X is the steepest of these three, Curve Y is of intermediate steepness, and Curve Z is the least steep (shallowest).

Which line on the graph shows the result for the largest pieces of zinc?

[3]

Controlling reactions Questions

  1. GCSE
  2. /Chemistry
  3. /Controlling reactions