The Magnesium Oxide Lab In a compound the atoms of different elements are present in numbers whose ratio is usually an integer or a simple fraction. The simplest (or empirical) formula of the compound expresses that ratio. Simplest formulas are determined by establishing the mass of each element present in a sample of the compound. From those masses one finds the number of moles of each element present. The mole ratio is also the atom ratio in the compound and that ratio provides the subscripts
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of the nitronium ion reaction with the methylbenzoate. 3. Why does water stop the reaction? Water stops the reaction because of Le Châtlier’s principle. Since water is a product‚ when more is added it drives the reaction to the reactant side. More nitric acid is produced‚ which is not a strong enough electrophile to react with methyl benzoate‚ which stopped the reaction. 4. According to your TLC plate‚ how many products did your reaction produce and which isomers are produced? My reaction produced
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Finding the percentage of copper in brass alloy. Introduction This is an investigation to find out how much copper is in a brass alloy. The brass alloy we are experimenting on is called Muntz Metal. Muntz metal is 60% copper‚ 40% zinc and a hint of copper [http://en.wikipedia.org/wiki/Muntz_metal] (accessed 4/10/12). Muntz metal was developed as an alternative to expensive‚ heavy copper. It is comprised of about 60% copper and about 40% zinc‚ with a small amount of iron. The finished product actually
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exists many problems of construction materials industry. Energy consumption of construction materials industry accounts for 7% of national total energy consumption and 10% of industrial energy consumption. Because of dust‚ sulfur dioxide and nitrogen oxide emissions‚ building materials industry is the key industry national emission regulation. Therefore‚ green development‚ recyclable development and low carbon development become the healthy development of building materials industry direction. The
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material/ in the manufacture of iron Powdered limestone + high temperature+ sand+ sodium carbonate= glass powdered limestone + powdered clay + heat= cement cement powder + water + sand +gravel= concrete Limestone + strong heating= quicklime (calcium oxide) + carbon dioxide (thermal decomposition) To make lots of quicklime we use a lime kiln 1) fill the kiln with crushed limestone 2) heat it strongly with a supply of hot air quicklime comes out of the bottom of the kiln‚ waste gases leave at the top
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Question 2 A 3.145 g sample of a certain lead ore containing lead(II) carbonate‚ PbCO3‚ was heated gently with 25.00 mL of nitric acid of concentration 0.6293 mol/L. The equation for this reaction is: PbCO3(s) + 2HNO3(aq) ( Pb(NO3)2(aq) + H2O(l) + CO2(g) When the reaction was complete and no more CO2 was evolved‚ the mixture was cooled and the excess nitric acid was titrated against NaOH solution of concentration 0.1423 mol/L. The volume of NaOH required was 23.41 mL. The equation
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N10/4/CHEMI/SP2/ENG/TZ0/XX 88106105 CHEMISTRY STANDARD LEVEL PAPER 2 Thursday 11 November 2010 (afternoon) Candidate session number 0 1 hour 15 minutes 0 INSTRUCTIONS TO CANDIDATES • • • • Write your session number in the boxes above. Do not open this examination paper until instructed to do so. Section A: answer all of Section A in the spaces provided. Section B: answer one question from Section B. Write your answers on answer sheets. Write your session number
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Acid –Base Titration: A volume of 128 mL of 0.650 M Ba(OH)2 was required to completely neutralize 50.0 mL of nitric acid solution (HNO3). What is the concentration of the acid solution? Gravimetric Titration: Calculate the molar concentration of Ba2+ ions in a 500.0 mL sample of an unknown aqueous solution if 2.47 g BaSO4 is formed upon the addition of excess Na2SO4? Stoichiometry of Acid –Base Reactions: What volume of 0.800 M HCl is required to completely neutralize 35.0 g of Ca(OH)2
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solutions of CuSO₄ (0.13M‚ 0.11M‚ 0.090M‚ and 0.070M) were prepared by crushing the copper sulfate with a mortar and pestle. The copper sulfate was then added into different volumetric flasks with 10.0 mL of distilled water. Also‚ 10 drops of concentrated nitric acid were added to the solutions. By placing each solution in the spectronic 20 device‚ the absorption measurements were noted down and graphed. Data Collection: M = mol/vol CuSO₄ + 5H₂O CuSO₄ = 249.5896g 0.13M 0.13M = mol/ 0.100L =
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0 g of each of the following acids are needed. Find the volume of each that must be measured out in a graduated cylinder. A. hydrochloric acid (HCl)‚ density = 1.164 g/mL B. sulfuric acid (H2SO4)‚ density = 1.834 g/mL C. nitric acid (HNO3)‚ density = 1.251 g/mL 7. A rectangular block of lead (Pb) measures 20.0 mm X 30.0 mm X 45.0 mm. If the density of Pb is 11.34 g/cm3‚ calculate the mass of the
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