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Activity 7: Try This
Directions: Follow the steps below to illustrate the concepts discussed on the previous pages. Use the Text Editor to document your observations and answer the
questions.
Materials
You will need: two sugar cubes (or Lifesavers candies), warm water, two cups, and two spoons
• Grind one sugar cube or Lifesaver up into little pieces.
• Fill the two cups with warm water.
• As close to the same time as possible, put the whole sugar cube (LIfesaver) into one cup of water and the ground sugar (Lifesaver) into the other cup. Stir each
briefly for 30 seconds.
• Observe the time required for the complete dissolving of the sugar (LIfesaver) in each cup.
1. How do the times compare? Which reaction rate is faster?
2. How does the collision theory help explain your observations?
3. Do you think the fact that the water was warm or the stirring affected the outcome of the experiment. Why or why not?
Click here to open the Text Editor E
To use the Text Editor:
1. Open the text editor using the link provided, or from the toolbar.
2. All of the writing assignments that are available for the unit are displayed by activity number.
3. When the assignment is complete, click on the save essay button
4. To submit the essay for the teacher's review, click on the Submit for Grading button. Once a writing assignment is submitted for grading, the essay can no
longer be edited unil It is reviewed by the leacher. If the teacher adds comments to the essay but does not grade it, the comments will appear on the Student
Progress page and on the appropriate activily page. The essay can be revised and resubmited to the teacher for grading.
5. If you are not ready to submit your writing assignment, click on Continue to access, revise, and submit your essay at a later date.
Note:
If the activity number is disabled it means that it is a linked assionment. Linked assignments are available when the student is expected to create and submit multiple
copies of the same writing assignment. For example, the first writing assignment requires the student to submit a rough draft, and the second writing assignment
requires the student to submit a final copy of the assignment. Linked aclivities are not avallable to the student until the first activily in the sequence has been
submitted for grading. When a teacher reviews a linked activity the comments will appear in all of the activities in the sequence and the contents of the previous
activity will appear in the editor.
Press Play to view a video tutorial on how to create and edit an essay:
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Answer
To answer the questions posed in the activity, the time required for the complete dissolving of the sugar in each cup must be compared. The reaction rate of the ground sugar will be faster than the whole sugar cube. The collision theory explains that the smaller particles of the ground sugar have more surface area, allowing for more collisions with the water molecules, resulting in a faster reaction rate. The fact that the water was warm and the stirring may have affected the outcome of the experiment, as the heat energy and stirring motion can increase the rate of reaction.