mummion which absorbed all the moisture from the body to dry it out‚ and then it was wrapped up in linen bandages. Mummion is an inorganic solid that is obtained from dried up lake beds and it used to mummify the dead bodies. I am going to explain what Ions are including Cations and Anions because it is the background information needed to carry out this investigation. An ion is an atom or molecule which the total number of electrons isn’t equal to the total number of protons giving the atom a positive
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Topic 1.2 AMOUNT OF SUBSTANCE The mole Reacting masses and atom economy Solutions and titrations The ideal gas equation Empirical and molecular formulae Ionic equations Mill Hill County High School THE MOLE Since atoms are so small‚ any sensible laboratory quantity of substance must contain a huge number of atoms: 1 litre of water contains 3.3 x 1025 molecules. 1 gram of magnesium contains 2.5 x 1022 atoms. 100 cm3 of oxygen contains 2.5 x
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GRADE 11 CHEMISTRY (30S) Final Practice Examination Answer Key GRADE 11 CHEMISTRY (30S) Final Practice Examination Answer Key IInstructions The final examination will be weighted as follows Modules 1–3 Modules 4–6 The format of the examination will be as follows: Part A: Fill-in-the-Blanks Part B: Multiple Choice Part C: Short Answer Total Marks Include units with all answers as required. Useful Information You will need the following in order to complete this examination: n n n n 15–20% 80–85%
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Inside the living body‚ implanted metals are primarily exposed to highly oxygenated body fluids containing inorganic ions (chloride‚ carbonate‚ calcium‚ etc.)‚ proteins‚ lipids‚ amino acids and cells that assemble around the implanted metal [1]. Biomaterials devices made of smart metals such as the equiatomic binary alloy‚ nickel-titanium (commonly known as nitinol)
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the factors which affect its lytic activity. The assay method reported by Smolelis and Hartsell (1949) has been found to be accurate and highly adaptable to the study of this enzyme. This report concenms its application to the effect of pH‚ salts‚ ions‚ temperature‚ and manner of preparation of the cell suspension‚ on the activity of lysozyme. MATERIALS AND METHODS Preparation of the cell suspension. To expedite the testing of lytic activity by lysozyme ’and to reduce the possibility of daily
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perception in chemistry. Before 1828‚ it was accepted and believed that organic compounds and life are dependant on a metaphysical force‚ the“vital principle”‚ and cannot be created by inorganic compounds. In 1828‚ Frederick Wöhler disproved this theory by forming urea‚ an organic compound‚ by heating an inorganic salt. Although Wöhler’s chemical reaction might seem analogous to any other simple chemical reaction‚ in context‚ it was the first of its kind and would change chemistry forever. Every
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meets sodium hydroxide to form sodium chloride and water: HCl + NaOH NaCl + H2O Adding an acid to a base does not necessarily mean that the product is automatically neutralised. The strength of each of the reactants must be matched so that all the ions released by the acid find a place with the base. A strong acid with a weak base will result in an acidic salt‚ a weak acid with a strong base will result in a basic salt‚ while acids and bases of the same strength will neutralise
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chloride/ammonium hydroxide reactions both formed bifurcations. The cobalt chloride/ammonium hydroxide reaction was then investigated under different conditions until discernable Liesegang rings had formed. • It was found that the rate of diffusion of ions was increased when a D.C. current was passed through the gel‚ however the placement of the positive electrode had a dramatic effect on band formation. Band dissolution occurred when the electrode was placed at the top‚ and closer‚ more defined bands
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1. Ions are assumed to be charged‚ incompressible‚ nonpolarizable spheres. 2. Ions try to surround themselves with as many ions of opposite charge as closely as possible. Usually in the packing arrangement‚ the cation is just large enough to allow te anions to surround it without touching one another. 3. The cation to anion ratio must reflect the stoichiometry of the compound. For MgCl2 the lattice must be an array of chloride anions with only half that number of magnesium ion. An
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Ionic Bonds • bonding between a metal and non-metal or the bond between a positive ion and a negative ion forming a binary compound. • end in the suffix "ide" • Or bonding between a metal and a complex ion. Steps in writing formulas: • • • • Use a periodic table of elements and of ions. Write the symbol and charge of the cation first (positive ion) Write the symbol and charge of the anion next (negative ion) Use criss-cross rule to balance for an electrically neutral compound. Name Symbol and
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