Although most students see science projects as another school requirement they have to fulfil, it is still a golden opportunity to acquire skills, knowledge and experience not only in the world of science but in terms of workmanship as well. There are a variety of factors that can separate great science projects from those that are merely average. The way it is presented is one such factor; you can present two simple science projects using vinegar, salt and water in four various methods.
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Making dull pennies shiny through vinegar and salt is a good science project to demonstrate. This method is done by dipping dull pennies into a mixture of vinegar and salt. This chemical reaction is mainly due to the copper's characteristics of turning into copper oxide upon constant exposure to air. Copper oxide leaves a dull and greenish quality compared to the copper's shiny quality. Copper oxide is easily broken down by an acid and salt. Since vinegar is an acid --- an acetic acid to be exact --- the combination of vinegar and salt can easily break down the copper oxide in dull pennies, leaving a shiny one in its wake.
Cleaning pennies with the use of salt and vinegar can also be a good subject for experimentation, which also happens to be a common science project. You can experiment which combination will be more likely to dissolve the copper oxide: vinegar and salt; vinegar and water; or just vinegar. You can present your hypothesis, the result and the conclusion you can draw from the experiment.
Models are particularly utilised to show a principle among a crowd. Salt crystals are creative and fascinating models to show the halite characteristics of salt. You can create your own salt crystals by combining salt, hot water and vinegar. Hot water makes it easier for salt to melt compared to cold water. Once the vinegar evaporates, it merely leaves behind the salt, which has been taken crystal-like qualities.
Creating salt crystals with a variety of colours is a fun science project to show everyone at school. You can show salt crystals in various environments including those that are on sponges, on cloth or even on wood. You can even portray the differences of salt crystals when in these environments.
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