Alka-Seltzer Lesson Plan

This lesson will take 45 minutes to complete.


  • The students will record data they collect from the experiment and their observations.

  • The students will create a graph with the data they collected from the experiment and their record sheet.


  • Concepts:

    • Graphing

    • conclusion drawing

    • states of matter

  • Generalizations:

    • States of matter change through a variety of reasons.

    • Graphing is a good way to record results.

  • Terminology:

    • Graph: a diagram that shows (as by dots or lines) the change in one variable in comparison with that of one or more other variables

    • Liquid: has no fixed shape, but instead has a characteristic readiness to flow and therefore takes on the shape of any container.

    • Gas: a substance that has no fixed shape and tends to expand without limit

    • Solid: has a fixed shape, has weight, and takes up space

    • dissolve: to mix or cause to mix with a liquid so that the result is a liquid that is the same throughout

  • Essential Questions:

    • How does one record data in an organized fasion?

    • How does a graph help record data?

    • How does matter relate to everyday life?



 First I will have the students predict what they think will happen when they put the tablet into the water in a paragraph, and have some students read out loud what they have written. We will then write down the properties of the tablet (solid) and the water (liquid) on the board.


The students will then push their seats together so they can work with a partner. After this I will have one student from each grouping to collect their materials from the teacher.
After this I will have the students measure the weight of a small bottle, 3/4 full of water, the cap, and 1/8 piece of Alka-Seltzer tablet separately. These weights will be recorded on a record sheet and be recorded on a graph. Once the students are done weighing and recording the materials, they will put the water inside the bottle. Once the materials have been assembled the students will drop the piece of the Alka-Seltzer tablet into the water and quickly put the cap back on. The students will then weight the bottle with the water and the Alka-Seltzer. They will then record their results and place these results on their graph. The students will begin to loosen the cap slowly so they can see the reaction of the Alka-Seltzer and at the same time make sure that none of the water spills out of the bottle. Once all the gas has escaped the bottle the students should once again weigh the bottle, the water and the cap. I will ask the students why the water reacted this way, was this a chemical reaction or a reaction to the temperature? The students will record and graph these results too.


We will then discuss the term dissolve and compare our data. I will then have the students write a paragraph with their results and the conclusions they have reached using what they have observed, their record sheets, and the graphs they have made. We will talk about how the conclusion may or may not have supported their thesis.


 I will assess the students on their knowledge by grading their graphs, paragraphs, and record sheets.


  • 1/8 Alka-Seltzer tablet

  • small bottle with cap

  • pencil

  • blank piece of paper to record observations

  • graphing paper

  • ¾ cup water

  • piece of paper

  • balance