in accordance with Edexcel Limited copyright policy. ©2011 Edexcel Limited. Printer’s Log. No. Turn over N36637A W850/U7081/57570 5/5/5/ *N36637A0120* Leave blank Answer ALL the questions. 1. Complete the table. Name of compound calcium bromide NH4NO3 sodium sulphite copper(I) oxide PbO2 iron(III) sulphate Q1 (Total 6 marks) Formula of compound 2 *N36637A0220* Leave blank 2. Complete the following statements by inserting the missing colours. (a) When water is added
Premium Atom Chlorine Oxygen
to extract the caffeine from the tea bags that were provided‚ and then recrystallize the caffeine. The solvents used in the experiment were an aqueous sodium carbonate and dichloromethane (DCM). Anhydrous calcium chloride pellets were used to dry the solution and emulsion layer and the DCM was then decanted. After washing the anhydrous calcium chloride pellets with more DCM‚ the solvent was evaporated‚ leaving greenish-white crystalline caffeine residue weighing about .25 mg. In order to recrystallize
Premium Solvent Chemistry Tea
Rate of reaction Design Lab Background: Reaction rate is most commonly defined as the speed at which a reaction takes place. This rate can be altered by many factors such as temperature‚ pressure‚ concentration‚ volume‚ or the use of a catalyst. In order for a reaction to occur‚ the atoms must collide in the correct orientation to break the bonds and must also have more energy than the needed activation energy. If their energy is not high enough‚ the reaction will not be able to take place. By
Premium Carbon dioxide Chemical reaction Calcium carbonate
Chemistry 1 Revision Booklet Unit Chemistry 1 Syllabus At the beginning of each sub-section‚ activities are stated which develop candidates. skills‚ knowledge and understanding of how science works. Details are then given of the substantive contexts in which these skills‚ knowledge and understanding should be set. It is expected that‚ where appropriate‚ teachers will adopt a practical approach‚ enabling candidates to develop skills in addition to procedural knowledge and understanding. Note that
Premium Chemistry Science Physics
including the testing of soil acidity/basicity. • Indicators are used regularly in chemical laboratories during chemical reactions. One important use is to determine the end point of a titration when an acid reacts with an alkali. The reactants and products of such a reaction are colourless so an indicator is a useful way to visually determine when the reaction is complete. Chemists also need to monitor how acidic or alkaline waste solutions from industries are before they are pumped into rivers
Premium PH Carbon dioxide Oxygen
ammonium nitrate * copper (II) nitrate * lead (II) nitrate * zinc nitrate * potassium nitrate All POTASSIUM‚ SODIUM and AMMONIUM compounds are soluble in water e.g. * ammonium chloride * sodium sulphate * potassium carbonate * sodium hydroxide * potassium oxide Table I showing rules for solubility in water SALTS | SOLUBLE
Premium Ammonia Solubility Chemistry
task. In this exercise‚ different species of Poriferans were observed. It will be used then to determine their | |defining characteristics as an invertebrate. The skeletal elements of the Poriferans‚ the spicules‚ are formed enzymatically by the anabolic | |enzyme silicatein and the catabolic enzyme silicase. Both‚ the spicules of Poriferans‚ comprise a basal skeleton made up of calcium carbonate‚| |central axial canal and an axial filament which harbors the silicatein. The data collected
Premium Phylum
ANALOGUE: Nuts and Bolts Table 4.2. Mass of nuts and bolts Mass of nuts (g) 4.126 Mass of bolts (g) 24.176 Mass of nut-and-bolt pairs 14.000 Table 4.3. Summary of results on nuts and bolts. B. THE TARGET: Reaction of Sodium Carbonate and Calcium Chloride. Table 4.4. Observations from the reaction between Na2CO3 and CaCL2. Sample Observations Na2CO3 solution COLORLESS CaCL2 solution COLORLESS Na2CO3 + few drops of CaCL2 Produced a cloudy‚ white mixture After Filtration Precipitate
Premium Sodium chloride Sodium Solvay process
structural and chemical features in Winogradsky column and to show the acknowledgement of microbial cells in Winogradsky column. Materials of experiment Pond mud Calcium sulfate Calcium carbonate Shredded paper Pond water Cylinder Aluminum foil Methods 1. Prepare pond mud 2. Add calcium sulfate and calcium carbonate 3. Add piece of paper 4. Add pond water 5. Seal top of the column 6. Put beside window Process (sequence of the reaction) The less of oxygen makes
Premium Photosynthesis Oxygen Bacteria
Design Lab #17: Reaction Rate - Calcium Carbonate & Hydrochloric acid Design D: Introduction: In this experiment calcium carbonate will be put into a flask and mixed with hydrochloric acid to produce calcium chloride‚ water and carbon dioxide. The formula for this reaction is: CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l) Purpose: The purpose of this experiment is to determine how the surface area of CaCO3(s) affects the rate of
Premium Carbon dioxide Chlorine Calcium carbonate