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Oxidation and Reduction
153
Oxidation and Reduction—Demonstration Kits,
continued
The Floating Tin Sponge—
Chemical Demonstration Kit
By: The Flinn Staff
Before your very own eyes, you can actually see the formation of shiny tin crystals. The tin is produced by the addition of zinc to a tin(II) chloride solution. Bubbles of hydrogen produced in the reaction float the aggregate tin to the surface like a sponge. Demonstration Notes included.
Concepts: Oxidation–reduction, single replacement reactions, electro- chemical series, acids, metals.
Time Required: 20 minutes
Chemicals Provided: Tin(II) chloride solution and zinc.
See free video at flinnsci.com.
A Colorful Decomposition of a Carbonate—Chemical Demonstration Kit
By: Borislaw Bilash II
Pascack Valley High School, Hillsdale, NJ
Challenge students to deduce the chemical reaction that leads to dramatic color changes when a sample of copper carbonate is heated. Copper carbonate is added to a flask and a wine airlock containing bromthymol blue solution is placed on top of the flask. The flask is then heated on a hot plate, decomposing the green copper carbonate to black copper oxide and carbon dioxide gas. The gas bubbles through the bromthymol blue indicator solution, lowering the pH and causing a color change from blue to yellow. Through a series of guided questions, students determine what reaction is occurring and what products form. Demonstration Notes, reproducible student worksheet, and answer sheet are included.
Concepts: Decomposition, gas solubility, indicators.
Time Required: 15 minutes
Materials Provided: Copper(II) carbonate, bromthymol blue indicator solution, wine airlock, 1-hole rubber stopper.
Rapid Oxidation—
Chemical Demonstration Kit
By: Jim and Julie Ealy, Retired
The Peddie School, Hightstown, NJ
This is one of the safer fire, brimstone and smoke reactions. When you add a small amount of glycerin to potassium permanganate, your students will witness the oxidation of glycerin by a permanganate. The reaction is very dramatic with lots of smoke and fire erupting from your evaporating dish. Spectacular, but safe! Demonstration Notes included.
Concepts: Oxidation–reduction, exothermic reactions.
Time Required: 15 minutes
Chemicals Provided: Potassium permanganate and glycerin.
Note: Perform this demonstration in a fume hood or well-ventilated lab.
The Floating Tin Sponge—Chemical Demonstration Kit AP4425
Catalog No.
Description
Price/Each
AP4425
The Floating Tin Sponge— Chemical Demonstration Kit
$44.65
Catalog No.
Description
Price/Each
AP6602
A Colorful Decomposition of a Carbonate— Chemical Demonstration Kit
$22.15
A Colorful Decomposition of a Carbonate— Chemical Demonstration Kit AP6602
Rapid Oxidation— Chemical Demonstration Kit AP2087
Catalog No.
Description
Price/Each
AP2087
Rapid Oxidation—Chemical Demonstration Kit
$20.00
OXIDATION AND REDUCTION—DEMONSTRATION KITS continued on next page.