The lattice energy value obtained from the Born-Haber cycle is derived from experimental data. It is also possible to calculate a theoretical value for lattice energy by assuming the compound is fully ionic. For ionic compounds with high covalent character‚ the difference between the experimental and theoretical values would be quite significant. Unlike the Born- Haber cycle‚ the energy level diagram must have an energy axis and a datum line. The datum line
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Assessment 1) Describe the difference between ionic and covalent bond. Ionic bonds have electrostatic forces that hold cations and anions together‚ and are electronic neutral. Covalent bonds are bonds that don’t give or take any electrons. In stead they share the elctrons 50) Which of these compounds contain elements that do not follow the octet rule? Explain. a) NF3: 5 + (7*3) = 26 b) PCl2F3: 5 + (7*2) + (7*3) = 40 c) SF4: 6 + (7 *4) = 24 d) SCl2: 6 + (7*2) = 20 The answer is “d”
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Julia Supangan blk. 2-4 The Reaction of Various Metals with Ionic Salts Purpose: To examine the reaction of various metals with ionic salts Materials: * 4 test tubes * test tube racks * 10mL measuring cylinder * 4 metals (in containers)- Zn‚ Sn‚ Mg‚ Fe * copper (II) sulphate solution Safety: 1. Be careful with copper (II) sulphate solution it is poisonous and corrosive. handle with care 2. Do NOT BREATH in any gases produced 3. If you touch any of the
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Chemistry SCH4U-B Lesson 1 Key Questions 1. The development of MRI imaging technology is one useful spinoff of basic research into the structure of the atom. Research‚ however‚ is expensive. Many people argue that the high cost of research outweighs its potential benefits. Provide one argument for‚ and one argument against increasing current
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University Purpose The aim of this experiment is to investigate the properties of several substances with the purpose of determining whether they are molecular‚ ionic‚ macromolecular or metallic. Introduction Chemical substances could be named ionic‚ molecular or metallic substance‚ based on the kind of bond present in it. Solid ionic compound is composed of ions‚ which are held together by large electrostatic forces. Bonding in molecular substance is caused by the sharing of electrons by atoms
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where VFO2 is the volume fraction of oxygen in dry air (generally 0.208)‚ P is the total pressure of the gas phase‚ and PH2O is the vapor pressure of the water. Under normal atmospheric conditions‚ the vapor pressure correction is negligible. As ionic strength increases‚ it is necessary to take into account the difference between activity and concentration of the
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Found @ wiki.answers.com 4. In ionic bonding‚ the atoms are bound by attraction of opposite ions‚ whereas‚ in covalent bonding‚ atoms are bound by sharing electrons to attain stable electron configurations. Found @ http://en.wikipedia.org/wiki/Ionic_bond#Comparison_with_covalent_bonding 5. There are many types of chemical bonds and forces acting together to bind molecules together. The two most basic types of bonds are characterized as either ionic or covalent. In ionic bonding‚ atoms transfer electrons
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|WEEK |LEARNING OBJECTIVES |LEARNING OUTCOMES |ACTIVITIES |REMARKS | |1 |FORM 4 ORIENTATION | | |4/1 – 6/1 |
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TUTORIAL 1: STK1503 BENZENE AND AROMATIC 1. Draw structures corresponding to the names given. a. m-fluoronitrobenzene b. p o-chlorophenol c. o-chlorophenol d. 3‚5-dimethylbenzoic acid e. 1-phenyl-3-methylpentane 2. Provide correct IUPAC names for each of the following compounds. a. NO2 CH3 b. c. CH3 d. NH2 H2N CH3 e. Ph C H3 C C CH2CH2CH3 Ph 3. For each molecule below‚ predict whether the molecule would be expected to show aromatic character or not. Explain your answer
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hydrophobic tails of the surfactants dissolve in the grease on clothes fibers and the hydrophilic heads of surfactants dissolve in water. The attraction between water molecules and ionic heads lifts the grease from the clothes surface. Upon shaking‚ oil dirt breaks into small oil droplets. The repulsion between the same-charged ionic head on the oil droplets prevent them from coming together. The oil droplets are suspended in water and can be carried away by water. Apart from being an important ingredient
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