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Chemical Changes

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  1. Purpose
  2. Theory
  3. Materials
  4. Procedure
  5. Observations
    1. Errors
    2. Other Observations
  6. Conclusions

The purpose of this lab was to find out the indications of chemical changes and reactions when mixing two different substances, which are listed specifically in the Observations section. The purpose is also to find out how a percent by mass solution is made up. The data and observations that is recorded will help find out the indications of chemical changes and reactions. Since this is a very big part of the lab, it is imperative to take detailed notes and observations. Besides recording data, it is necessary to know how to calculate it. It will be needed to find out how a percent by mass solution is made up. It is also very important to have a good method of approach towards calculating this data because this is what drives the whole lab. Without the percent by mass solution calculations, we would not be able to make up the chemical solutions.

[...] In result, you are going to have unwanted chemical reactions, which can throw your observations off. Human error could not have been a big part in our lab. It was carried out with the most care. Other Observations This lab was carried out fairly well. The safety rules were followed very carefully and no one got hurt nor did many accidents occur. All the isles were cleared very well and all the materials were put away when it was time to go. [...]

[...] Chemical changes can also be indicated by precipitates. A big percentage of the solutions had precipitates: 1b, 2a, 2b, 2d, 3a, 3b, 3d, 4b, and 4c. Small particles were formed almost like crystals and they sank to the bottom of the test tube. After measuring the pH of the solution with the master chemical already in it, in most cases it appeared to be what the master chemical was. For instance, after pouring sulfuric acid into 2a, it became an acid; the same pH as the [...]

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