AIM: To outline what a precipitation reaction is‚ describe ways which one can predict whether a precipitation reaction would form or not‚ describe the uses of precipitation reactions in everyday activities and industries BACKGROUND INFORMATION: Precipitation is the formation of a solid in a solution during a chemical reaction‚ such as evaporation. A substance that causes precipitation when it is added to a solution is called a precipitant. This can occur when an insoluble substance is formed in
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(III) nitrate and .3 mL of 1 M ammonium thiocyanate. into clean 250 mL beaker. Add 75 mL of DS water. Mix well. Divide the solution into equal portions into four 6 inch test tubes. Number the test tubes (1-4). To tube 1‚ add 5 drops of DS water. Stopper this tube and invert it several times to mix it. Use this tube for as the control. To tube 2‚ add 5 drops of 1 M iron (II) nitrate. Put a cork stopper in tube and mix it by inverting it. Record color change. To tube 3‚ add 5 drops of 1 M ammonium thiocyanate
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Supplementary Textual Material in Chemistry for Class XI & Class XII 1 Acknowledgements CBSE ADVISORS Shri Vineet Joshi‚ I.A.S.‚ Chairman‚ CBSE Shri Shashi Bhushan‚ Director (Acad.)‚ CBSE CONVENOR & EDITOR Prof. A.K.Bakhshi Department of Chemistry‚ University of Delhi. DEVELOPMENT TEAM Prof. A.K.Bakhshi Department of Chemistry‚ University of Delhi. Dr. Anju Srivastava Hindu College‚ University of Delhi. Dr. Vimal Rarh S.G.T.B. Khalsa College‚ University
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This factor can be considered as one of the most important factor that influence the pH of the water. Soils contain calcium‚ limestone and a layer of sand or gravel with a granite base. The calcium and limestone are able to neutralize sulphuric or nitric acid. Due to the neutralizing effect‚ the pH of the natural water will be higher if the bedrock is composed of limestone. Therefore‚ the acidity of natural water would be offset or buffered due to the higher pH. Besides‚ the dumping of chemical
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of the following will be least soluble in water? A. potassium sulfate‚ K2SO4 B. ammonium nitrate‚ NH4NO3 C. chloromethane‚ CH3Cl D. calcium chloride‚ CaCl2 E. ethanol‚ C2H6O 3. Select the precipitate that forms when the following reactants are mixed. Mg(CH3COO)2(aq) + LiOH(aq) A. LiCH3COO B. Li(CH3COO)2 C. MgOH D. Mg(OH)2 E. CH3OH 4. Select the precipitate that forms when aqueous lead(II) nitrate reacts with aqueous sodium sulfate. A. NaNO3 B. Na2NO3 C. PbSO4 D. Pb2SO4 E
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Flame Test Lab Your company has been contracted by Julius and Annette Benetti. They are worried about some abandoned‚ rusted barrels of chemicals that their daughter found while playing in the vacant lot behind their home. The barrels have begun to leak a colored liquid that flows through their property before emptying into a local sewer. The Benettis want your company to identify the compound in the liquid. Earlier work indicates that it is a dissolved metal compound. Many metals‚ such as
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Naming Chemical Compounds General Information: Scientists all around the globe use a standard method for naming chemical compounds. The standards were set up by an international committee sponsored by the International Union of Pure and Applied Chemistry (IUPAC). Having this standard makes life easier for people who use these compounds everyday. It would be tough to set up any experiment if scientists everywhere used different names for the same compound. It would also make the lab a
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1. What is the molarity of a solution of ammonium chloride prepared by diluting 50.00 mL of a 3.79 M NH4Cl solution to 2.00 L? 2. A student takes a sample of KOH stock solution and dilutes it with 100.0 mLof water. The student determines that the diluted solution is 0.046 M KOH‚ but has forgotten to record the volume of the original stock solution sample. The concentration of the stock solution is 2.09 M. What was the volume of the original sample of stock solution? 3. A chemist wants to prepare
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(69.6%) (c) Percent of water (by mass) in the hydrate (55.9%) 4. Calculate the percentage of nitrogen (by mass) in the ammonium nitride (82.4%) Moles Worksheet 1. How many moles are there in 768 grams of iron (III) sulfate?(1.92 mol) 2. How many moles are there in 1.2 kg of potassium dichromate?(4.1 mol) 3. You have 13.2 moles of lead (II) nitrate. How many grams is this? (4.37 x 103 g) 4. How many pounds would 5.75 moles of magnesium hydroxide weigh?(0.739 lb) 5. How many
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Aim: To examine a number of different chemical reactions and determine if they are exothermic or endothermic. Apparatus: • Test tubes {Around 10-12 in number} • Test-tube rack • Spatula • Digital thermometer { ± 0.1° C} • Digital balance {± 0.01 g} • Measuring cylinder {± 0.5cm³} • Different chemicals Introduction/Theory: Exothermic reactions are those reactions that release energy in the form of heat. Endothermic reactions need to absorb energy in the form
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