Dental amalgam Question 5. What is the percentage of pure gold in a 12-carat gold bracelet? A. 25% B. 50% C. 75% D. 100% Question 6. Which of the following metals is not naturally found as a pure element? A. Platinum B. Silver C. Gold D. Sodium Question 7. During the process of froth flotation‚ waste material is separated from the ore. This waste material is called A. the overburden B slag C gangue D a mineral Question 8. Moving through the activity series for metals from potassium
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3.13 Test for Saponin glycosides 2g of dried plant powder add 5ml of distill water shake vigorously. Persistent of foam indicate the presence of saponin glycosides. 3.14 Test for Steroids (Salkowski’s test) 5ml of test solution add with 2ml of Chloroform and then Conc. H2SO4 sides of the test tubes. The appearance of color at the interface indicates the presence of steroids. 3.15 Experimental Procedure for preliminary Phytochemical studies (Brindha et al.‚ 1981) S. No Name of the Test
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MSG or monosodium glutamate is a sodium salt of glutamic acid which can be naturally found in many common foods that are rich in protein content such as dairy products‚ meat‚ vegetable and mother’s milk. In fact‚ our own bodies do produce glutamic acid via Krebs cycle during metabolizing food. Glutamate is the most abundant naturally occurring non-essential amino acid (Ninomiya‚ 1998) and it is a very common part of our diet. In the food industry‚ MSG is widely used as a flavor enhancer. It is responsible
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Report Introduction Mummification is an ancient Egyptian method which is a natural or deliberate process intended to dehydrate the body to preserve it. They done this because they believed that if a body was left to rot then it would destroy their soul‚ so they believed that the body needed to be intact to serve as host for the soul. So they preserved bodies so they could use them in the afterlife‚ where the Egyptians believed they would make a journey to another life. To start to mummify a body
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In its mineral form sodium chloride‚ NaCl‚ is known as common salt. It is important because it is essential to the health of human beings and of animals. for domestic use it is fined down to what is known as table-salt‚ and small quantities of other chemicals are added to it to keep it free-flowing when in contact with the atmosphere. Salt and potassium are combined to produce iodised salt‚ used when iodine is lacking in diet. It’s absence cause goitre‚ the swelling of the thyroid gland. Livestock
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Using the Iodine clock method to find the order of a reaction Introduction When peroxodisulfate (VI) ions and iodide ions react together in solution they form sulfate (VI) ions and iodide. This reaction is shown below: S2O82-aq+ 2I-aq SO42-aq+ I2(aq) The reactants and the sulfate (VI) ions are colourless however the Iodine is a yellow/brown colour. This allows you to measure the progress of the reaction through the colour change when the iodine is produced. In order to determine the order of
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Alkali Metals Introduction Alkali metals refer to six elements belonging to the Group IA of the long form of the Modern Periodic Table‚ viz. Lithium (Li)‚ Sodium (Na)‚ Potassium (K)‚ Rubidium (Rb)‚ Cesium (Cs) and Francium (Fr). Fr is a radioactive element. These elements are called so because they form strongly alkaline oxides and hydroxides. Electronic Configuration of Alkali Metals Each of the alkali metals has one electron in their outermost (valence) shell‚ which is just outside an inert
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The goal for this experiment is to determine which out of the four balanced chemical equations best represent the thermal decomposition of sodium bicarbonate. The guiding question will be answered with the outcome of the sodium bicarbonates thermal decomposition and it being plugged in into the four balanced chemical equations. John Dalton atomic theory explains two fundamental laws of chemistry which are the law of conservation of mass and the law of definite proportions. The atomic theory states
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contains ionic bonds. Otherwise‚ it likely contains covalent bonds. This was the hypothesis I posed at the beginning of the experiment. The independent variables used in this experiment were the tested substances (oil‚ cornstarch‚ sodium chloride‚ and sodium bicarbonate). The dependent variables in this experiment were the concluded properties of said substances. These included state of matter‚ appearance and texture‚ whether or not it had a crystalline
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the mixture will react differently to sodium bicarbonate and sodium hydroxide because each of the bases’ conjugate acids has a different pKa. The pKa’s of benzoic acid and 2-naphthol are 4.17 and 9.5‚ respectively‚ while naphthalene is a neutral compound. Since benzoic acid is much more acidic than 2-naphthol‚ the weak base‚ sodium bicarbonate‚ will be able to effectively remove benzoic acid’s acidic hydrogen. It will take the much stronger base‚ sodium hydroxide‚ to remove the hydroxide hydrogen
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