A Sequence of Chemical Reactions: Transforming Copper Briefly describe. a) Why must you carry out the oxidation of Cu with HNO3 in a fume hood? Concentrated nitric acid is a toxic oxidant. Avoiding skin contact or inhalation is highly important. The reaction between Cu and HNO3 produces NO2‚ a toxic brown gas; therefore working under the fume is necessary in order to prevent inhaling the toxic gas. b) Why you should be particularly careful when you work with 3 M H2SO4 solution? Sulfuric acid
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Electrochemical Series - Define oxidation and reduction in term of loss and gain of oxygen; loss and gain of electrons and change in oxidation state (number). • Oxidation is the loss of electrons; an increase in oxidation state or a gain in oxygen by a molecule‚ atom‚ or ion. • Reduction is the gain of electrons; a decrease in oxidation state or a loss of oxygen by a molecule‚ atom‚ or ion. • OIL RIG (Oxidation is Loss‚ Reduction is Gain) - Rules for assigning the oxidation numbers of an atom. •
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Thiamine-Catalyzed Benzoin Condensation I.Conclusion Benzoin was produced by reacting 2 mols of benzaldehyde with the catalyst thiamine to form a new C-C bond. A total of 2.626 grams were recovered. There was a 33% recovery of benzoin. The low percent recovery could be due to the purity of the limiting reactant‚ benzaldehyde. Upon filtration‚ the mother liquid appeared oily making it more likely that the low recovery was due to the solution ‘oiling out.’ This could be avoided in the future
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classify chemical reactions in various ways. Often a major classification is based on whether or not the reaction involves oxidation-reduction. A reaction may be classified asredox in which oxidation and reduction occur or nonredox in which there is no oxidation and reduction occurring. Redox Reactions A redox reaction can be recognized by observing whether or not the oxidation numbers of any of the elements change during the
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solvents‚ melting point (for solids)‚ and boiling point (for liquids). In this experiment‚ we will use melting point‚ boiling point‚ and solubility to identify certain solids and liquids. First‚ we will melt benzoic acid‚ benzoin‚ and an unknown substance. I believe the benzoin will have a small range melting point because it is a pure substance.
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Extracting sliver from used X-ray films using new techniques SUMMARY Silver is one of the precious metals that exists as silver halides and dark silver in X-ray films therefore recycling it is essential. I decided to carry out my research in the field of extracting silver from used X-ray films using new technique that dose not deplete ant metallic resources or energy resources meaning that the project must be environmentally friendly. My research consists of two parts‚ part one which is carrying
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small amount of lost product yields a great loss in the yield 4. These sources of error could be minimized by doing a larger reflux in order to increase the yield. However‚ as the purpose was to simply synthesis SnI4 in order to identify the stable oxidation states (the melting point range requires very little product) it would be advantageous to use the current method. This is due to the smaller quantity of materials needed for this type of reflux‚ thus making less of an environmental impact (using
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JEET SCIENCE ACADEMY CHOWK AZAM (LAYYAH) TIME 2.5 Hr CHEMISTRY 1st YEAR CH # 1‚2‚9‚10 Marks: 85 G.Super . 1 Name…………………………………………...... Objective ROLL NO. ………………………………. Q.NO.1. Encircle the correct answer? (1×17=17) 1. Atoms of which one of the follelement have independent existance: (A) Flourine (B) Krypton (C ) Oxygen (D) Nitrogen 2.18g glucose is dissolved
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Alkane‚ Alkene‚ Alkyne & Aromatic Learning Objectives 1. 2. 3. Determine the IUPAC name‚ common name and structure of an alkanes‚ alkenes and cycloalkanes. Identify the physical properties of alkanes. Describe briefly natural sources and importance of alkanes Describe reactions of alkanes Propose a mechanism on free radicals substitution 4. 5. 6. Describe the preparation and reactions of alkenes. 7. Propose mechanism on preparation; dehydration of alcohol 8. Define carbocation
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b. NaHCO3 (aq) + Ca(OH)2 (aq) → ? 3. Assign an oxidation number to each atom in: a. Al2O3 b. HAsO42c. NaMnO4 4. Identify the reducing agent and the oxidizing agent in the following reaction: MnO4- + 5 Fe2+ + 8 H+ → Mn2+ + 5 Fe3+ + 4 H2O 1. Balance the equation: FeS (s) + HCl (aq) → FeCl2 (aq) + H2S (g) Given 13.2 g FeS and 10.2 g HCl‚ determine: (a) how much H2S is formed‚ (b) how much excess reactant is left. 1. Assign the oxidation number to each atom in: a. Ga2O3 b. H3PO4
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