Chemical or Physical Reactions Science Fair Projects

An exploration of chemical reactions...

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Chemical and Physical Reactions

There are many reactions that your experiments can create. Some will be physical reactions, or reactions that have a physical impact on an object like an increase in speed or the change of direction. Others will have chemical reactions, which impact the chemical characteristics of an ingredient, such as turning a product to ash.

Objectives

(1). To determine whether the reaction between selected white substances and vinegar, water and iodine are chemical or physical.
(2). Make a hypothesis using observation, touch and smell.
(3). Through chemical analysis the students will be able to determine what happens to each of the substances - i.e. will they (a) clump or clot; (b) bubble or fizz; (c) separate; (d) give off a sweet or foul odor; (e) change colors.

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Apparatus Needed

(1). Petri dishes or Egg cart.
(2). Six white substances: powdered sugar, salt, baby powder, cornstarch, baking soda and plaster.
(3). Water
(4). Vinegar
(5). Iodine

CAUTIONS TO STUDENTS

Use of iodine can cause damage to clothing, irritation to skin and breathing iodine can be hazardous to your health.

Strategy

Test each substance individually with the following materials: water, vinegar and iodine. Make a hypothesis using observation, touch and smell.

Conclusion

The substances have been identified as follows: powder sugar, salt, baby powder, cornstarch, baking soda and plaster. 3rd party contributor

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