enable the fastest reaction to take place between solid calcium carbonate (marble chips) and dilute hydrochloric acid? [rr-13] YES concentrated acid‚ high temperature‚ small chips ? high temperature‚ small chips‚ dilute acid ? large chips‚ concentrated acid‚ low temperature ? low temperature‚ small chips‚ dilute acid Image50.gifImage51.gifImage52.gifSodium thiosulphate solution reacts with hydrochloric acid to form sodium chloride‚ sulphur dioxide‚ sulphur and water. The reaction can
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include sorbic acid (and its salts)‚ benzoic acid (and its salts)‚ calcium propionate‚ sodium nitrite‚ sulfites (sulfur dioxide‚ sodium bisulfite‚ potassium hydrogen sulfite‚ etc.) and disodium EDTA. Big Mac: Ingredients: • 100% BEEF PATTY‚ • BIG MAC BUN‚ • PASTEURIZED PROCESS AMERICAN CHEESE‚ • BIG MAC SAUCE‚ • SHREDDED LETTUCE‚ • PICKLE SLICES‚ ONIONS Preservatives: Calcium Carbonate- is used as a food preservative and color retainer in organic
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0.02519 M | 0.02519 M | 0.02519 M | [IO3-] | 0.0254 M | 0.0231 M | 0.0285 M | 0.0249 M | 0.0209 M | [Cu2+] | 1.66 x 10-2 M | 1.61 x 10-2 M | 1.76 x 10-2 M | 2.38 x 10-2 M | 3.58 x 10-2 M | Ksp | 1.07 x 10-5 | 8.59 x 10-6 | 1.43 x 10-5 | 1.48 x 10-5 | 7.48 x 10-4 | Class Data Group | Trial 1 (Ksp) | Trial 2 | Trial 3 | Trial 4 | Trial 5 | Molly and Brooke | 1.07 x 10-5 | 8.59 x 10-6 | 1.43 x 10-5 | 1.48 x 10-5 | 7.48 x 10-4 | Casey and Marissa | 4.60 x 10-6 | 8.00 x 10-6 | 9.24 x 10-6
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was completed using an approximately .7340g Na2EDTA/500mL solution. A 1.000g/L calcium ion solution was used as the primary standard with approximately 3mL of ammonium chloride as a buffer and Erichrome Black T as the indicator solution. Three titrations were performed to ensure accuracy of the molarity of the Na2EDTA solution. The 1.000g/L calcium ion solution had to be converted to M so 1g/L/100.1g=.009990M calcium ion solution. Titration 1: 10.00mL CaCO3; .00999MCaCO3X.0100L= .0000999mol CaCO3
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The Earth’s atmosphere has changed over billions of years‚ but for the past 200 million years it has been much as it is today. We are‚ however‚ causing our atmosphere to change by human activity. Burning fossil fuels and deforestation are two examples of human effect on the environment. Composition of the Earth’s atmosphere The composition of air You need to know the proportions of the main gases in the atmosphere. The Earth’s atmosphere has remained much the same for the past 200 million years
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| Concentration (Sydney water supply) (ppm) | Recommended maximum (ppm) | Chloride | 20 | 400 | Sulfate | 8 | 400 | Nitrate | 0.4 | 10 | Fluoride | 1 | 1.7 | Sodium | 10 | 300 | Calcium | 9 | 200 | Aluminium | 0.2 | 0.2 | * The concentration of sodium (Na+) and chloride (Cl-) ions are important indicators of the salinity of a water system‚ and also affect the taste of water * Magnesium and calcium ions are indicators of water hardness * Phosphate and nitrate ions need
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the reversibility of hydration reactions by hydrolysis‚ and also testing substances for efflorescence of deliquescence. Procedure: A. Identification 1. Place 0.5 grams of each compound (Nickel Chloride‚ Potassium Chloride‚ Sodium Tetraborate‚ Sucrose‚ Calcium Carbonate‚ and Barium Chloride) in a small dry test tube. 2. Heat gently with a burner flame and observe carefully. If droplets of water appear on the test tube it may be a hydrate. Note the nature and color of the residue.
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etc. iii. Solute. iv. Filtrate. v. Residue. vi. Immiscible and miscible liquids. vii. Distillate. viii. Sublimation i.e. examples of substances that sublime – iodine‚ ammonium salts‚ iron (III) chloride‚ aluminium chloride‚ etc. ix. Melting and boiling points. x. Chromatography. TEACHING/LEARNING MATERIALS: •
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Journal of Natural Sciences Research ISSN 2224-3186 (Paper) ISSN 2225-0921 (Online) Vol.2‚ No.4‚ 2012 www.iiste.org Study on the contents of bottled mineral water of various brands in Malaysia K.Kabilan1‚ K.Mughilan2‚ R.Sivaneswari3 Tunku Azizah National Primary School1‚2 Bandar Indera Mahkota‚ Kuantan‚ Pahang & No.15‚ Lorong IM 8/34‚ Taman Mahkota Putra3 Kuantan‚ Pahang‚ Malaysia *Email: kabilan2000@hotmail.com Abstract Mineral water has becomes very popular and is a necessity in the present
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(See teacher background information in Flame Tests‚ Atomic Spectra and Applications Activity) Introduction: Have you ever seen a fireworks display? Where do all of the colors come from? Below are some links to the chemistry of fireworks: http://chemistry.about.com/od/fireworkspyrotechnics/Fireworks_Pyrotechnics.htm http://alchemy.chem.uwm.edu/amalgamator/NCW/ncw2001/fireworks.html In this activity‚ you will investigate the colors of flame produced by solutions of metal
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