![]() ![]() Boiling point increases as you go down the group because the mass of each element increases and they have more electrons around their nuclei. All rights reserved.As you go down the halogens, from fluorine to astatine, the elements become darker in colour and have a higher boiling point. © 1999 Division of Chemical Education, Inc.,American Chemical Society. ![]() | Chemistry Comes Alive! (entry page) | Table of Contents | Matrix of Chapters and Topics | Index| Alphabetical List of Topics | Chemistry Textbooks | Write balanced chemical equations for the reactions occurringin each vial. Which halogen is most reactive, Br 2, Cl 2,or I 2? Which halogen is least reactive? Explain.ģ. How can you tell whether or not a reaction has occurred in avial?Ģ. Based on whether there is a color change, students could whether each of the possible reactions takes place, thereby showing that chlorine reacts with bromide and iodide, bromine reacts with iodide, and iodine does not react with either of the other halide ions.ĭemonstration Notes, Warnings, Safety Information, etc.ġ. ![]() Students could be asked to select a reaction and that reaction could be shown. This series of movies can be used to allow students to discover the order of oxidizing ability of the halogens. By observing the color ofthe hexane layer, we see that no reaction has occurred.ĢBr -( aq ) + I 2->No chemical reaction took place By observing the color ofthe hexane layer, we see that no reaction has occurred.ĢCl -( aq ) + I 2( aq )->No chemical reaction took placeīromide added to Iodine Play movie(QuickTime 3.0 Sorenson, duration 13 seconds, size 900 K)īromide ion is added to iodine water. By observing the color ofthe hexane layer, we see that the reaction has produced iodine.ĢI -( aq ) + Br 2( aq )->2Br -( aq ) + I 2( aq )Ĭhloride added to Iodine Play movie(QuickTime 3.0 Sorenson, duration 13 seconds, size 900 K)Ĭhloride ion is added to iodine water. Iodide added to Bromine Play movie(QuickTime 3.0 Sorenson, duration 15 seconds, size 1 MB) By observing the color ofthe hexane layer, we see that no reaction has occurred.ĢCl -( aq ) + Br 2( aq )->No reaction took place By observing the color ofthe hexane layer, we see that the reaction has produced iodine.ĢI -( aq ) + Cl 2( aq )->2Cl -( aq ) + I 2( aq )Ĭhloride added to Bromine Play movie(QuickTime 3.0 Sorenson, duration 13 seconds, size 870 K)Ĭhloride ion is added to bromine water. Iodide added to Chlorine Play movie(QuickTime 3.0 Sorenson, duration 15 seconds, size 1020 K) (Note that the hexane layer is above the aqueous layer.)ĢBr -( aq ) + Cl 2( aq )->2Cl -( aq ) + Br 2( aq ) By observing the color ofthe hexane layer, we see that the reaction has produced bromine. Solutions of chlorine, bromine, and iodine are shown here for later reference.īromide added to Chlorine Play movie(QuickTime 3.0 Sorenson, duration 16 seconds, size 1 MB)īromide ion is added to chlorine water. Six combinations of halidewith halogen are shown.ĭescriptive chemistry, halogens/halides/hydrohalic acids, periodic table/trends, redox reactionĪ series of aqueous halide solutions (Cl -( aq ), Br -( aq ) orI -( aq )) are poured into an aqueous solution of a halogen that is covered with a layer of hexane. After the liquid has been shaken,the color of the hexane layer is compared to the color of hexanesolutions of chlorine, bromine and iodine. Halogen/Halide Redox Reactions Halogen/Halide Redox ReactionsĪn aqueous solution of a halogen (Cl 2, Br 2or I 2) is poured into an aqueous halide solution(Cl -, Br - orI -) covered with a layer of hexane. ![]()
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