AP Chemistry Kit 4 - Le Chatelier’s Principle
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AP Chemistry Kit 4 - Le Chatelier’s Principle Info:
Aldon® Innovating Science™ AP Chemistry kits offer cutting-edge science for the classroom! This kit helps science teachers teach science without the need for a lot of laboratory preparation. Enough materials for 15 setups. Includes teacher’s and student’s guides. Grades 9-12.
Le Chatelier’s principle is a qualitative rule which allows the prediction of the effect of temperature, pressure, and concentration changes on chemical reactions. The principle states: A chemical system at equilibrium when stressed by external forces, will adjust in such a way as to minimize that stress. For example, when a system is subjected to increased pressure, it adjusts so that it will occupy less volume. This offsets the pressure increase. If ice is placed under an increased pressure, it melts because the water obtained from a given mass of ice occupies less volume. In the formation of ammonia (the Haber process) from hydrogen and nitrogen, the product of the reaction (NH?) occupies less volume than the two uncombined gases. The increase in pressure favors the production of ammonia.
This experiment is divided into three separate reactions demonstrating how different types of stress affect equilibrium. Students are asked to predict the outcome of each situation and then prove or disprove their predictions.
Kit includes:
• 6 x 25 ml - Hydrochloric acid 36% solution UN1789
• 1 x 200 ml - Sodium hydroxide 0.1N solution UN1824
• 2 x 25 ml - Bromothymol blue 0.04% solution
• 1 x 25 g - Potassium thiocyanate crystals
• 2 x 200 ml - Potassium thiocyanate 0.002M solution
• 2 x 25 ml - Ferric nitrate 0.2M solution
• 1 x 100 g - Sodium chloride crystals
• 1 x 25 g - Sodium phosphate dibasic heptahydrate
*NOTE: This item can only be shipped via Ground Service.
