Here is cbse 2007 question paper of science: CBSE X SCIENCE AND TECHNOLOGY (Theory) 2007 (OUTSIDE DELHI) Time allowed: 2 hours 15 mins; Maximum Marks: 100 General Instructions: | 1) | The question paper comprises of two sections A and B. You are to attempt both sections. | 2) | You are advised to attempt all the questions of Section A and Section B separately. | 3) | All questions are compulsory. | 4) | There is no overall choice. However‚ internal choice has been provided in some questions
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EXPERIMENT 6 – Empirical Formula of a Compound INTRODUCTION Chemical formulas indicate the composition of compounds. A formula that gives only the simplest ratio of the relative number of atoms in a compound is the empirical formula or simplest formula. The ratio usually consists of small whole numbers. We call a formula that gives the actual numbers of each type of atom in a compound the molecular formula. The numbers in a molecular formula will be whole number multiples of the numbers in an empirical
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Chemistry 1: PROBLEM SET SY 2012/2013 CLASS #: _______________ NAME_________________________________________ SECTION: ______________________ Stoichiometry II - Mole Calculations/ Limiting and Excess Reagent – Lecture Notes 1. Given the balanced equation N2(g) + 3H2(g) 2NH3(g) How many moles of ammonia are produced when 0.60 mol of nitrogen reacts with hydrogen? 2. Given the equation: SiO2 + HF SiF4 + H2O a. Calculate the number of moles HF that would completely react with 2.5 moles of
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fertilizer‚ acids‚ alkali‚ ammonia‚ chlorine‚ paper‚ pulp‚ rayon‚ bleaching powder etc. However‚ private sectors have rather been enthusiastic in chemical and allied products namely: pharmaceutical products‚ paints and varnishes‚ edible oil processing‚ soaps and detergents‚ cosmetic and toiletries etc. Chemicals Industries in Bangladesh belong to mainly Chlor-Alkali Plant & its Chlorinated product and Hydrogen peroxide plant. Main products are Caustic Soda‚Chlorine‚ Hydrochloric Acid‚ Sodium Hypochlorite
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reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper to remove this layer so that the underlying metal can be exposed into air. Question 2: Write the balanced equation for the following chemical reactions. (i) Hydrogen + Chlorine → Hydrogen chloride (ii) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride (iii) Sodium + Water → Sodium hydroxide + Hydrogen Answer (i) (ii) (iii) Question 3: Write a balanced chemical equation with state symbols for
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Case Study Turnaround at the Preston plant Traci L Harris Management – MGT370 Ken Hjelmstad December 12‚ 2010 Case Study Turnaround at the Preston plant The Preston plant of Rendall Graphics was located in Preston‚ Vancouver. The plant was bought from the Georgetown Corporation by Rendall in March 2000. The plant produced Precision coated papers for ink-jet printers which accounted for the majority of the plant’s output. The plant started to experience problems in the quality of
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‚ by heating mercurv(II) oxide‚ HgO‚ to decompose it into its elements. How many moles of oxygen could Priestley have produced if he had decomposed 517.84 g of mercury oxide? 0. Iron(III) chloride‚ FeCl3‚ can be made by the reaction of iron with chlorine gas. How much iron‚ in grams‚ will be needed to completely react with 58.0 g of Cl2? 194. Sodium sulfide and cadmium nitrate undergo a double-displacement reaction as shown by the following equation: Na2S + Cd(N03)2 —* 2NaN03 + CdS What is the mass
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CHM130 Lab 5 The Atomic Mass of Beanium Name: Paige Miller A. Data Table: Insert your Data Table here with your sample calculations. You must show at least one sample calculation per procedure step. (16 points) Part I Data Table Sample Mass (mg) Number/Qty Average Mass (mg) Relative Abundance Relative Weight (mg) Kidneybeanium 1660.00 mg 3 553.33 mg 0.2143 118.58 mg Pintobeanium 2830.00 mg 6 471.67 mg 0.4286 202.16 mg Blackeyedpeaium 1110.00 mg 5 222.00 mg
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Exercise 14: Qualitative Anion Tests PURPOSE: The purpose of this experiment is to identify some commonly occurring anions & to study some of the reactions used for their identification. PROCEDURE: You must first determine to which of the three groups the various anions belong. Since no two people observe the same event in exactly the same way it is important to also conduct specific confirmation tests on the known samples of each anion. This information will help identify the anion
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acid attack the thionyl chloride as a nucleophile1. Thionyl chloride then undergoes a loss of a leaving group as chlorine will leave1. The compound is then deprotonated from the free chlorine and SO2 is expelled as a gas as it is an excellent leaving group (Figure 2)1. Diethyl amine can then be reacted with the compound via a nucleophilic attack. Once the amine is attached chlorine will leave as a leaving group as the carbonyl group reforms (Figure 3)1. This provides a simple two-step process
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