(a) Using bond-dissociation enthalpies from Table 4-2 (page 143), calculate the heat of reaction for each step...
Question:
(b) Calculate the overall heat of reaction.
Br2 CH heat or light CH,Br HBr TABLE 4-2 Bond-Dissociation Enthalpies for Homolytic Cleavages A:BA-+-B kcal/mol Bond H-X bonds and X X bonds Bonds to sacondary carbons D-D F-F a-C Br-Br 1-1 H-F H--CI H-Br (CHCH-H (CH CH-F (CH,CH-CI (CH, CH- Br CHHCH-I CHACH OH 38 335 192 151 381 136 431 Bonds to tertiary carbons 381 (CH),CH CHCF (CH)C-C (CH),C-Br (CH),C-I CH,,C-OH 71 119 HO-H 331 213 Medıyl bond CH,-H CH3-F 381 91 351 PhCH H (benzylic) C CHH H (allylic) CH CH H (viny) Ph H(aromatic) HC-m C-H (acetylenic) CH, Br 70 CH OH 381 91 113 Bonds to primary carto 410 CH,CH F CH,CH C CH,CH Br CH,CHI CH,CH,-OH CH,CH CH2 H CH,CH CH F CH,CH CH CI CH,CH CH Br CH,CH CH2I CH,CH CH2 OH 107 C-C bonds CH CH CH,CH CH, CH,CH, CH,CH (CH)CH- CH (CH),C CH 285 381 410 91 351 81 381 91
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a bH o for the reaction is the sum of theH o value ...View the full answer
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Using a few basic physics principles, you can impress your friends with a trick that makes a bottle disappear. For this experiment, you will need a mini plastic bottle, glycerin, a glass, and a funnel. First, open the bottle and pour some glycerin into it, then close the bottle tightly. Next, pour some water into the glass using a funnel. Place the mini bottle into the glass of water and it will look normal. This is because light travels through air faster than it travels through the glass and water, allowing our eyes to see the bottle inside the glass. However, when you fill the mini bottle with more glycerin, and pour glycerin into the glass, then put the glycerin filled bottle into the glass with glycerin in it. Half of the bottle that is submerged in the glycerin will become invisible as the light travels through glass and glycerin at the same speed, thus it does not bend and no refraction takes place, making the bottle invisible. This happens because both glass and glycerin have almost the same refractive index, which causes the speed of light to be the same in both mediums, causing no bending of light and making the bottle disappear.
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