precipitation is carried out slowly‚ which can be done by dissolving Ca2+ and C2O42- in acidic solution & gradually increasing the pH by thermal decomposition of urea‚ Co(NH2)2. Equation : Co(NH2)2 + 3H2O CO2 + 2NH4+ + 2OH- Methyl red indicator: [below pH 4.8 – red ; above pH 6.0 - yellow] Sample experimental Data Funnel #1 Funnel#2 Average Mass of glass funnel‚ initial (grams) 35.2653 34.5269 34.8961 Mass of glass funnel + ppt. after drying (grams) 35.6653 34.9569 35.3111 Mass of product
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In the Lewis symbol for a fluorine atom‚ there are __________ paired and __________ unpaired electrons. A) 4‚ 2 B) 0‚ 5 C) 2‚ 5 D) 6‚ 1 E) 4‚1 2. Which of the following would have to gain two electrons in order to achieve a noble gas electron configuration? O Sr Na Se Br A) Sr B) Br C) Sr‚ O‚ Se D) Na E) O‚ Se 3. The electron configuration of the S2- ion is __________. A) [Ne]3s23p2 B) [Ne]3s23p6 C) [Kr]3s22p-6 D) [Ar]3s23p2 E) [Ar]3s23p6 4. The ion NO- has __________
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FIITJEE Talent Reward Exam for student presently in Class 10 PAPER–1 Time: 3 Hours Maximum Marks: 214 Instructions: Caution: Question Paper CODE as given above MUST be correctly marked in the answer OMR sheet before attempting the paper. Wrong CODE or no CODE will give wrong results. 1. This Question Paper Consists of 7 Comprehension Passages based on Physics‚ Chemistry and Mathematics which has total 29 objective type questions. 2. All the Questions are Multiple Choice Questions having only one
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Signature Candidate Number For Examiner’s Use Examiner’s Initials Question Mark General Certificate of Education Advanced Level Examination January 2011 1 2 3 Chemistry Unit 4 Kinetics‚ Equilibria and Organic Chemistry 9.00 am to 10.45 am Wednesday 26 January 2011 CHEM4 4 5 6 7 For this paper you must have: ● the Periodic Table/Data Sheet‚ provided as an insert (enclosed) ● a calculator. TOTAL Time allowed ● 1 hour 45 minutes Instructions ● Use black ink or black
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0 gram iron rod to the solution and observe the reaction. 2 Fe + 3 CuSO4 = 3 Cu + Fe2(SO4)3 The new product is iron (III) sulfate‚ it contains the Fe 3+ ion which is brown. Lead (II) nitrate and potassium iodide solutions Pour about 2.0 mL of lead (II) nitrate into the test tube. Add 5 to 10 drops of potassium iodide solution to the test tube and record your observations of the reaction. Pb(NO3)2 + 2 KI = 2 KNO3 + PbI2 2. Magnesium metal and hydrochloric acid solution Place one
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or trans) CH2CH3 C) CH3 CH2=CCH2CHCH2CH3 CH3 CH2 D) CH3CH2CCHCH2CH3 CH3 CH3 E) CH3CH2CHCHCH=CH2 CH3 Ans: B 241 Keghan Chapter 8 Topic: Structure Elucidation 2. Ozonolysis of compound Z yields the products shown below. What is the structure of Z? O Z 1) O3 2) Zn‚ HOAc O 2HCH + CH3CCH2CH O I II III O H IV A) B) C) D) E) O V I II III IV V Ans: B 242 Keghan Chapter 8 Topic: Structure Elucidation 3.
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and formed products based on a BALANCED chemical equation. Mass Molar Mass Mole Coeff Bal Eqn Mole Molar Mass Mass Example 2 • The Haber Process involves reacting gaseous nitrogen and gaseous hydrogen to form ammonia. Determine the mass in grams of hydrogen gas required to form 1.00 x 103 g ammonia. Your Turn 2 • If you react 52.9 g of potassium chlorate (KClO3) with excess phosphorus‚ what mass of tetraphosphorus decoxide (P4O10) would be produced. KClO3
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" Jupiter Infomedia. (2008): Print http://www.indianetzone.com/2/sepoy_mutiny.htm 17 Hunter‚ William . A brief history of the Indian peoples. 1. 1. Whitefish‚ Montana : Kessinger Publishing‚ 2008. 222- 234. Print’ McLeod‚ John. The History Of India Naidis‚ Mark. India:a short introductory history. 1. 1. New York: THE MACMILLAN COMPANY‚ 2002. 119-124. Print Pike‚ John "Sepoy Mutiny‚1857." Jupiter Infomedia. (2008): Print http://www.indianetzone.com/2/sepoy_mutiny.htm Smitha‚ Frank
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(2) (b) A gas oil fraction from the distillation of crude oil contains hydrocarbons in the C15 to C19 range. These hydrocarbons can be cracked by strong heating. (i) Write the molecular formula for the alkane with 19 carbon atoms. (ii) Name the type of reaction involved in cracking. (iii) Write an equation for one possible cracking reaction of the alkane C16H34 when the products include ethene and propene in the molar ratio 2:1 and only one other compound. (4) (Total 6 marks) 2. A compound
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concentration of a range of include: The frequency of rainfall (floods and droughts)‚ water temperature and evaporation rates. Land clearing and pollution‚ such as fertiliser usage and industrial waste are factors caused by human activity. Looking at figure 2 and 3‚ some well-known examples include increased dissolved salt concentration in the Dead Sea due to high evaporation and damaged aquatic life near the Great Barrier Reef caused by run-off from agricultural land. Eutrophication is caused by an excess
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