common household products. * To construct an operational definition of an acid and a base‚ using the characteristic properties of those substances. II. Procedure A. For acids * Place 2ml each of dilute acetic acid‚ hydrochloric acid‚ sulfuric acid‚ carbonated drink (colorless) and calamansi juice extract in separate test tubes. Test every solutions with blue and red litmus paper. Then add a drop of methyl orange indicator to each solutions. Record the data then wash
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Student Number Mark / 39 Chemistry Preliminary Course Final Examination • 2006 General Instructions • • • • • • • Reading time – 5 minutes Working time – 45 minutes Write using black or blue pen Draw diagrams using pencil Board-approved calculators may be used A Data Sheet and a Periodic Table are provided Write your Student Number at the top of this page Total Marks – 39 Part A – 10 marks • Attempt Questions 1 – 10 • Allow about 10 minutes for this part Part B – 29 marks • Attempt
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NSS Chemistry Part 3 Metals HKCEE Past Paper Questions – Structural Questions 1. HKCEE 1995 Q1 Rubidium (Rb) and potassium belong to the same group in the Periodic Table. The relative atomic mass of rubidium is larger then that of potassium. (a) Explain whether rubidium is more reactive than potassium. (b) Write a chemical equation for the reaction between rubidium and water. (State symbols should be given.) (c) Suggest how rubidium can be stored safely in the laboratory.
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oxide+ carbon dioxide Single displacement is the replacement of one element with another in a compound. One of the elements is one of the reactants‚ and a metal replaces a metal or a non-metal replaces a non-metal. Eg. Magnesium + zinc sulphate = magnesium sulphate + zinc Double displacement is the swapping of elements‚ usually forming a solid. Eg. Lead nitrate + sodium chloride = sodium nitrate + lead chloride Neutralization is the reaction between an acid and alkali/base/carbonate . One example
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but the light rays are scattered? A. Transparent B. Opaque C. Translucent D. Water proof 4. Bronze is made up of A . Iron and Tin B. Lead and Iron C. Carbon and Zinc D. Copper and Tin 5. What acid is found in Vinegar? A. Lactic acid B. Hydrochloric acid C. Ethanoic acid D. Propanoic acid 6. Igneous rocks are also called as A. Fire Rock B. Ice rock C. Coal D. Lime stone 7. The process by which rocks break up to form fragments is called
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Yuri Anthony D. Sucgang BMLS-IA Electrophoresis Machine Gel Electrophoresis Apparatus(Aragose Gel) Electrophoresis is the motion of dispersed particles relative to a fluid under the influence of a spatially uniform electric field. Gel electrophoresis is a laboratory procedure used to separate biological molecules with an electrical current. In this lesson‚ we’ll review how agarose gel electrophoresis works and introduce the equipment necessary to perform an electrophoresis experiment.
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17M acetic acid (acidified water) Solution of Sodium thiosulfate Granular zinc Iodine crystals Zinc ion and iodine-iodide-triiodide ion in water Solid zinc iodide Mineral oil Silver nitrate Magnesium turnings 3M Hydrochloric acid (HCl) solution 2 boiling tubes 1 large tube (we used a small) Pipet Beakers (to hold tubes) Bunsen burner PART 1 Procedure Get a boiling tube and label it R (reactants). Weigh out 2g of granular zinc and 2 g of iodine crystals and add to boiling tube “R”. Get a large test
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------------------------------------------------- Hydrochloric acid From Wikipedia‚ the free encyclopedia (Redirected from Muriatic acid) Not to be confused with hydrogen chloride. Hydrochloric acid | | | | Other names[hide] * Muriatic acid[1] * Spirits of salt[2] | Identifiers | CAS number | 7647-01-0 | ChemSpider | 10633809 | UNII | QTT17582CB | EC number | 231-595-7 | ChEMBL | CHEMBL1231821 | ATC code | A09AB03‚B05XA13 | Properties | Appearance | Colourless
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move in solid/free to move in molten/liquid state drop small tube in acid/loosen string/idea of mixing zinc and acid/let go of cotton ALLOW: cut the string NOT: heat (the acid) NOT: pull the string (b) (i) (ii) (iii) [2] [1] correct plotting including 0-0 point ( - 1 per omission or error) best curve drawn and to go through origin no more gas produced/reaction finished; all zinc reacted/used up [2] graph drawn with faster initial rate and starting at 0-0; ALLOW: straight
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objective was to isolate eugenol from cloves. An amount of 30 grams of dried cloves and 300 mL of water was distilled over a flame for over 2 hours. The distillate underwent extraction with dichloromethane‚ water and sodium hydroxide. Concentrated hydrochloric acid was added to the aqueous extract to lower it to pH 9; it was again extracted with 2 x 30 mL of DCM. These organic extracts were dried over anhydrous magnesium sulfate‚ filtered into a pre-weighed flask and had their
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