Give example with equation. 14What are oxidation and reduction reaction? 15. Why do gold and platinum not corrode in moist air? Short Answers 1. Write balanced chemical equation for. a. Zinc metal reacts with aqueous solution of hydrochloric acid to form zinc chloride solution and hydrogen gas. b. Solid mercury (II) oxide is heated‚ liquid mercury and oxygen gas is produced. c. Aqueous solution of sulphuric acid and sodium hydroxide react to form aqueous sodium
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CONCENTRATED HYDROCHLORIC ACID ALCOHOL OBSERVATIONS Secondary butyl alcohol Tertiary butyl alcohol Q3. Classify the alcohols used in this experiment as primary‚ secondary or tertiary. Q4. Use your answer to question 1 and the results in Table 2 to explain how mixing an alcohol of unknown structure with Lucas. Reagent can help one to determine whether it is primary‚ secondary or tertiary. Q5. Write down an equation for the reaction of tertiary butyl alcohol with concentrated hydrochloric acid
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equation with state symbols for the following reactions. (i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride. (ii) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water. Answer (i) (ii) Page 1 of 13 Class X Question 1: Chapter 1 – Chemical Reactions and Equations Science A solution of a substance ‘X’ is used for white washing
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Candidate name…………………………………………………………………….. MINISTRY OF EDUCATION MASALA SECONDARY SCHOOL BOARD MOCK EXAMINATION 2014 SCIENCE 5124/3 PAPER 3 (CHEMISTRY) 1hour 15minutes Additional materials: Monday 30th July 2014. Answer paper INSTRUCTIONS TO CANDIDATES Write your name‚ centre number and candidate number at the top of this page all separate Attempt all questions in SECTION A and only TWO questions in SECTION B SECTION A (45 marks)
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Nitric Acid * Fume Hood * 400 mL beaker * Tap water * Sodium Hydroxide * 25 mL graduated cylinder * Stirring Rod * Distilled Water * Heater * Tong * Sulfuric Acid * 100 mL graduated cylinder * Zinc * Hydrochloric Acid Observations: 1. Addition of nitric acid to copper: * Solution turns blue * Emits orange gas * Copper Nitrate is formed 2. Addition of sodium hydroxide to copper(II) nitrate: * Blue crystals liquefy *
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can be divided into two types – Balanced Chemical Equation and Unbalanced Chemical Equation. Balanced Chemical Equation: A balanced chemical equation has number atoms of each element equal on both sides. Example: In this equation‚ numbers of zinc‚ hydrogen and sulphate are equal on both sides‚ so it is a balanced chemical equation. According to Law of Conservation of Mass‚ mass can neither be created nor
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| |Mass of zinc metal |1.80 g | |Mass of beaker containing zinc chloride |58.16 g | B. Follow-Up Questions (Show all work for calculations.) 1. Calculate the mass of zinc chloride produced. You know the original mass of the beaker. You also
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Added 20 ml of a 0.001 M aqueous hydrochloric acid solution and sonicated to dissolve and degassed. The resultant solution diluted up to the mark with diluents to obtain 1000 μg/ml. Further stock solution was used to prepare plasma standards to construct the calibration curve. C. Pre-chromatographic isolation of baclofen from plasma Prior to chromatography‚ baclofen from plasma constituents was isolation by adding 0.25 ml of acetonitrile and approximately 25 mg of zinc sulphate crystals to 0.50 ml of
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in the reaction mixture increases as the reaction proceeds. Hence the progress of the reaction can be followed by measuring the concentration of H+(aq) ions by titrimetric analysis. 9 F The hydrogen gas formed in the reaction between zinc and dilute hydrochloric acid CANNOT escape from a closed reaction vessel. Thus‚ the mass of the reaction mixture would NOT decrease as the reaction proceeds. 10 F It is difficult to measure the volume of water produced from the reaction between oxalate ions
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education *1144188971* COMBINED SCIENCE Paper 2 (Core) 0653/21 October/November 2010 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number‚ candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams‚ graphs‚ tables or rough working
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