To identify the species being oxidized and reduced in oxidation-reduction reactions and determine which species is the oxidizing agent and the reducing agent. Chemical equations represent what occurs in a chemical reaction. For example‚ the equation HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l) describes an acid-base reaction‚ a type of exchange reaction in which the driving force is the formation of water. In an exchange reaction‚ the
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Na Sodium Intense yellow P Phosphorus Pale bluish green Pb Lead Blue Rb Rubidium Red to purple-red Sb Antimony Pale green Se Selenium Azure blue Sr Strontium Crimson Te Tellurium Pale green Tl Thallium Pure green Zn Zinc Bluish green to whitish green Sources of error for the flame test: The test cannot detect low concentrations of most ions. The brightness of the signal varies from one sample to another. For example‚ the yellow emission from sodium is much brighter
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of the five most commonly consumed food vehicles as reported by the National Food Consumption Survey. The National Food Consumption Survey reported that for South African children as a whole‚ the average dietary intake of energy‚ calcium‚ iron‚ zinc‚ selenium‚ vitamin A‚ vitamin D‚ vitamin C‚ vitamin E‚ riboflavin‚ niacin‚ and vitamin B6 was less than 67% of the Recommended Dietary Allowances (RDA)‚ and in many cases below 50% of the Recommended Dietary
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Chemical # 2 (4 Drops) Observations Chemical Change (Y/N) A1 NaHCO3 SodiumBicarbonate HCl Hydrochloric Acid Bubbles yes A2 NaOCl Sodium-Hypochlrite Kl Potassium Iodide Observation 1: None Add 2 drops of solution Observation 2: Solution turned blue Yes A3 Kl Potassium Iodide Pb(NO3)2 Lead Nitrate Turned Yellow Yes A4 NaOH Sodium Hydroxide C20H14O4 Phenolphthalein Turned pinkish red (magenta) Yes A5 HCl Sodium Hydroxide C20 H14 O4 Phenolphthalein Turned Cloudy Yes A6 NaOH Sodium Hydroxide AhNO3
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etc. ½ 5. Activity : Metal Q is added to salt solution of P. Q being more reactive ; displaces metal P from its salt solution. Chemical equation : Metal Q + Salt solution of P → Salt solution of Q + Metal P. Example : Zn Zinc + CuSO4 → ZnSO4 + Cu 1 Copper sulphate Zinc sulphate Copper 1 6. 1 volt is the potential difference between two points in a current carrying conductor when 1 joule of work is done to move a charge of 1 coulomb from one point to another. 1 Potential difference = =
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properties of three common compounds‚ CO2‚ H2‚ O2. Materials: Zinc Hydrochloric acid Hydrogen peroxide Manganese dioxide Calcium Carbonate (marble chips) Safety:The Hydrochloric acid used in this experiment could cause blindness upon contact with the eyes. Wear your goggles and handle it with care. Procedure: I. Place approximately 0.5 g of Zn metal in a test tube. Add about 5 ml of HCl. Place a second test tube upside down on top of the test tube with
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Chemical Reactions. Well Chemical #1 (4 drops) Chemical #2 (4 drops) Observations: Chemical Change (Y/N) A1 NaHCO3 Sodium Bicarbonate HCl Hydrochloric Acid A2 NaOCl Sodium Hypochlorite KI Potassium Iodide Observation 1: + Add 2 drops of starch Observation 2: A3 KI Potassium Iodide Pb(NO3)2 Lead Nitrate A4 NaOH Sodium Hydroxide C20H14O4 Phenolphthalein A5 HCl Hydrochloric Acid C20H14O4 Phenolphthalein A6 NaOH Sodium Hydroxide AgNO3 Silver Nitrate B1 AgNO3 Silver Nitrate NH4OH Aqueous Ammonia
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| UV‚ IR‚ NMR‚ MS | (verify) (what is: /?) Except where noted otherwise‚ data are given for materials in their standard state (at 25 °C‚ 100 kPa) | Infobox references | Hydrochloric acid is a clear‚ colourless solution of hydrogen chloride (HCl) in water. It is a highly corrosive‚ strong mineral acid with many industrial uses. Hydrochloric acid is found naturally in gastric acid. Historically called muriatic acid‚ and spirits of salt‚ hydrochloric acid was produced from vitriol (sulfuric
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Marker White Vinegar Hydrogen peroxide Measuring spoons Straw Tissue paper Baking soda Test tubes 24 Well Plate Pipet Stoppers for the test tube Chemicals provided by Labpaq Procedure: Place a piece of mossy zinc in the test tube that contains diluted HCl. Cap the tube with the stopper that has the gas delivery tube through the center of it. Stand it up straight in the well plate‚ using the tissue paper if necessary Fill
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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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