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Sabtu, 01 Juni 2013

9th Grade Chemical Reaction Projects

9th Grade Chemical Reaction Projects

There is a large variety of chemistry experiments that help 9th-graders learn more about chemistry and chemical reactions. Many of the projects use common household items to illustrate how solutions and substances interact with one another. Because of the sometimes violent nature of chemical reactions and the chemicals used, it is important to conduct the experiments and projects safely, with adult supervision, special gloves and safety goggles.

Photochemistry Science

    David B. Whyte, on the website sciencebuddies.org, describes a project that illustrates how light can affect the rate of some chemical reactions. Sometimes light provides an "energy boost," as shown in this experiment that converts iodine, a dark-orange solution, to colorless iodide. The project also helps 9th-graders learn about common photochemical reactions in nature, such as suntanning.

Solar-Powered Chemistry

    Another experiment from David B. Whyte on sciencebuddies.org, examines the effect temperature has on the rate of a chemical reaction. This project uses ultraviolet (UV) beads, which can detect UV light. The beads change color when exposed to UV radiation. The experiment allows students to determine how temperature speeds up the UV beads' color change.

Basic Chemical Reaction

    Kids-science-experiments.com offers an easy chemical reaction that can be performed by using Diet Coke and Mentos candies to show how the candies interact with the cola to form a strong reaction. "Rocket Cola" is a fun experiment that must be performed outside since it can get messy. Students can observe how quickly the candy reacts with the drink to cause it to violently launch into the air. Other mint candies also do the trick.

Particle Size and Chemical Reactions

    Andrew Olson, writing for sciencebuddies.org, describes an experiment that tests whether the size of the reactants causes the reaction to speed up or slow down. It uses common over-the-counter Alka-Seltzer tablets, which produce carbon dioxide gas as soon as the tablets are placed in water. The project calls for students to first note the time it takes the tablets to disintegrate in water. Then the tablets are broken into smaller pieces and placed in the water to see if the reaction happens more quickly.

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