Keghan Chapter 8 MULTIPLE CHOICE QUESTIONS Topic: Structure Elucidation 1. An alkene adds hydrogen in the presence of a catalyst to give 3‚4-dimethylhexane. Ozonolysis of the alkene followed by treatment with zinc and acetic acid gives a single organic product. The structure of the alkene is: CH3 A) CH3CH=C-CHCH2CH3 (cis or trans) CH3 CH3 B) CH3CH2C=CCH3 (cis or trans) CH2CH3 C) CH3 CH2=CCH2CHCH2CH3 CH3 CH2 D) CH3CH2CCHCH2CH3 CH3 CH3 E) CH3CH2CHCHCH=CH2
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OXIDATION AND REDUCTION Oxygen makes up only about 20% of the air‚ yet is the essential component for so many reactions. Without it fuels would not burn‚ iron would not rust and we would be unable to obtain energy from our food molecules through respiration. Indeed animal life on the planet did not evolve until a certain concentration of oxygen had built up in the atmosphere over 600 million years ago. The term oxidation has been in use for a long time to describe these and other reactions where
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hydroxide. Acetylene is combustible‚ and burns when ignited. Acetylene was discovered in 1836 by Edmund Davy who identified it as a "new carburet of hydrogen". Acetylene gas is colorless and is mainly uses as efficient gas and chemical building blocks and it also has the highest flame temperature of any common hydrocarbon because of its triple-bond structure H-C=C-H. The acetylene gas is very flammable and it produces a burst of flame when it is ignited. Its high flame temperature allows it to be
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t-Pentyl Chloride is a compound that is created through an SN1 nucleophilic substitution reaction in addition with Hydrogen Chloride in order to isolate the product. A variety of procedural techniques were utilized during the experiment including extraction‚ washing liquids‚ drying liquids‚ gravity filtration‚ and simple distillation. When a single solute or compound is transferred between two different solutes‚ it is known as extraction. Another technique that was utilized was washing‚ in which
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Chem_Chap17.fm Page 517 Friday‚ May 21‚ 2004 1:48 PM Table 17.2 Heats of Combustion at 25°C Substance ∆H (kJ/mol) Formula Hydrogen H2(g) Ϫ286 Carbon C(s)‚ graphite Ϫ394 Methane CH4(g) Ϫ890 Acetylene C2H2(g) Ϫ1300 Ethanol C2H5OH(l) Ϫ1368 Propane C3H8(g) Ϫ2220 Glucose C6H12O6(s) Ϫ2808 Octane C8H18(l) Ϫ5471 Sucrose C12H22O11(s) Ϫ5645 Table 17.2 lists heats of combustion for some common substances. The heat of combustion is the heat of reaction for the complete burning
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® Copying is permitted according to the Site Licence Conditions only keep it simple science Preliminary Chemistry Topic 2 METALS What is this topic about? To keep it as simple as possible‚ (K.I.S.S.) this topic involves the study of: 1. OUR USE of METALS 2. CHEMICAL ACTIVITY of the METALS 3. PATTERNS of the PERIODIC TABLE 4. QUANTITY CALCULATIONS... the MOLE 5. METALS from their ORES ...all in the context of how Chemistry contributes to cultural development but first‚ an introduction
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exposed to air properly. Q.2. Write the balanced equation for the following chemical reactions: (i) Hydrogen + Chlorine → Hydrogen chloride Ans. H2 (g) + Cl2 (g) → 2HCl (g) (ii) Sodium + Water --> Sodium hydroxide + Hydrogen Ans: 2Na (s) + 2H2O (liq) → 2NaOH (aq) + H2 (g). Q.3. Write a balanced chemical equation with state
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catalysts which will improve efficiency or produce a greater yield. An acidic catalyst works due its acid nature. Catalysts are strong acids and readily give up hydrogen ions‚ or protons: H+. Protons can be released from hydrated ions‚ for example H3O+‚ but more commonly they are released from ionisable hydroxyl groups (R-OH) where the O-H bond is broken to produce R-O- and H+. When the reactant receives protons from an acid it undergoes a conformational change‚ (change in shape and configuration)‚ and
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ical Chemistry 1.which of the following pairs of compound will react? iC3H6+Br2 iiC3H6+Cl2 in sunlight iiiC3H6+H2O in the presence of sulphuric acid ivC3H6+H2O in the presence of concentrated sulphuric acid a.i b.i‚iii c.i‚ii‚iii d.all 2.liqiud y reacts with magnesium metal to produce a gas that burns with a pop sound when a flaming wooden splint is placed near it.liqiud y is most likely a compound that has the formula a.c2h5oh b.hcooh c.h3cooch3 d.c6h14 3.a compound p has the
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the result of an oxidation reaction. The oxidation proceeds in two steps‚ which ultimately lead to the production of the aminophthalate anion in an excited state and the elimination of water and molecular nitrogen. The formation of the strong triple bond (N≡N) is a major factor in the release of energy in the form of light. Luminol‚ a chemical widely used in the forensics community‚ reacts with iron to generate a luminescent reaction. When forensics teams want to determine whether or not traces of
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