EXPERIMENT I Photoreduction of Benzophenone Introduction The study of chemical reactions‚ isomerizations and physical behavior that may occur under the influence of visible and/or ultraviolet light is called Photochemistry. The fundamental principles for understanding photochemical transformations are that light must be absorbed by a compound in order for a photochemical reaction to take place‚ and that for each photon of light absorbed by a chemical system only one molecule is activated for
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ELECTROPHILIC ADDITION PURPOSE The purpose of this lab is to learn how to synthesize 2-methyl-2-butene into 2-bromo-2-methylbutane using addition of hydrogen bromide. THEORY Chemical Compound Molecular Formula Molecular Weight Boiling Point Melting Point Density Amylene CH3CH=C(CH3)2 70.13 g/mol 36 oC -134 oC 0.662 g/ml Hydrobromic Acid HBr 80.91 g/mol 126 oC -11 oC 1.490 g/ml 2-Bromo-2-MethylButane C5H11Br 151.05 g/mol 107 oC 1.18 g/ml Sodium bicarbonate NaHCO3 84.007 g/mol Decomposes
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Q. 1. During the electrolysis of molten lead bromide‚ which of the following takes place : A : Bromine is released at the cathode. B: Lead is deposited at the anode. C : Bromine ions gain electrons. D: Lead is deposited at the cathode. Ans : - D. Q. 2. Here is an electrode reaction : Cu → Cu2+ + 2e-. [i.e. Cu- 2e- →Cu2+]. At which electrode(anode or cathode) would such a reaction take place. Is this an example of oxidation or reduction. Ans : - At anode. Oxidation. Q. 3. A solution contains
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chlorine side. This forms a domino effect where the electrons of each atom tend to the side of the chlorine atoms within the electron shell‚ including the oxygen atom attached by the potentially proton-becoming hydrogen atom. This intensify the electronegativity difference between oxygen and hydrogen which leads to the dissociation of the proton in acetic acid and contribute to the increased stability of the conjugate base‚ thus the chlorinated variations have greater KAs than non-chlorinated acetic acid
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(distilled water) X 0.1M cobalt (II) chloride hexahydrate X 95% ethanol X 0.1M cobalt (II) chloride hexahydrate dissolved in 95% ethanol X zinc X 1M hydrochloric acid solution X 0.1M copper (II) sulfate solution X 0.5M sodium hydrogen carbonate solution X 1M ammonia solution X magnesium X 1M sodium hydroxide solution X ammonium chloride Procedure: A. Be sure to always start with clean‚ dry test tubes‚ equipment‚ and tools. B. Put a label on each test
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electron-deficient Lewis base and electron-rich Lewis acid in the absence of compounds that are unable to donate protons. There are two types of boron-hydrogen bonds‚ in which the classical B-H bond is a 2-center-2-electron bond similar to the carbon-hydrogen bond. The non-classical bond‚ however‚ has two electrons formed between two boron atoms and one hydrogen atom‚ making it a 3-center-2-electron bond1. Although this bonding is unique‚ boron hydrides are common reagents in organic syntheses1.
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|Chemistry Review 1 |TEACHER ANSWER KEY | | |June 06‚ 2011 | | | |’see explanation below’
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() and crosses (x) in the diagram are electrons neutrons protons (1 mark) 1 (a) (iii) The bonds between the nitrogen and hydrogen atoms in ammonia are covalent ionic metallic (1 mark) (02) G/J68916/Jun11/CHY2F 3 1 (b) Ammonia is made by reacting nitrogen with hydrogen in the Haber process. The equation for this reaction is shown below. nitrogen 1 (b) (i) + hydrogen Do not write outside the box ammonia Use words from the box to complete the sentences.
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thing form in chemical reactions? Products are the finished product of a chemical equation‚ and reactants are what make up the products. ( atoms‚ matter‚ molecules‚ energy‚ rate‚ temperature) Name some compounds: H2O (Hydrogen and Oxygen elements - Water) CH4 (Carbon and Hydrogen elements - Methane) NaCl (Sodium Chloride- salt) Different types of compounds: Metal + Metal = Metallic Compound Metal + Non-Metal = Ionic compound Non-Metal + Non-Metal = Covalent compound Different types of reactions:
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Introduction When Henry Cavendish discovered hydrogen in 1774 and Joseph Priestley found oxygen in 1776‚ neither man would expect the effect these elements could have on modern science‚ namely rockets. But creating a rocket is just combining these two gases in a closed environment‚ and one spark. This lab exemplifies just that what happens when the gases H2 and O2 are chemically combined with a spark. In this lab‚ the objective was to see how far a pipette filled H2 and O2 could travel. One half
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