Properties of Chemical Reactions Ms. Whitty‚ Science 10 Fiona Adams‚ November 1st‚ 2012 Introduction Chemical reactions are a part of our daily lives‚ from rusting metal to making bread to leaves changing colour in the fall. A chemical reaction is the process that occurs when two or more substances combine to produce a chemical change. When a chemical reaction takes place‚ the change is indicated by one or more qualitative properties. The colour or odor could change‚ gas could be produced
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weighing 0.180g is treated with AgNO_3 solution to give 0.3715g of precipitate. Calculate the content of NaCl and NaBr in the mixture. 18. Solution Both NaCl and NaBr give white and pale yellow ppts of AgCl and AgBr respectively on reaction with AgNO3. Let the amount of NaCl in the mixture = y grams
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There are many types of chemical reactions‚ five general ones of which I will be describing. Chemical changes are a result of chemical reactions. All chemical reactions involve a change in substances and a change in energy. Neither matter nor energy is created or destroyed in a chemical reaction‚ only changed. There are so many chemical reactions that it is helpful to classify them into 5 general types‚ which include the following: synthesis‚ combustion‚ decomposition‚ single-replacement‚ and double-replacement
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sodium hydroxide was titrated against a solution of hydrochloric acid of unknown concentration. 27.3 cm3 of the acid was required. What was the concentration of the acid? 3. 10 cm3 of a solution of NaCl react with 15 cm3 of a 0.02 moldm-3 solution of AgNO3. What is the concentration of the NaCl solution in gdm-3? 4. 25 cm3 of a 0.1 moldm-3 solution of an acid HxA reacts with 75 cm3 of a 0.1 moldm-3 solution of NaOH. What is the value of x? Equation: HxA + xNaOH + NaxA + xH2O 5. A solution of hydrochloric
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solution. If precipitate forms‚ then K+ ion is present. * Test for Cl-: Place about 10-20 drops of unknown solution into individual small test tubes or vials. Add 1M HNO3 dropwise until each test solution is acidic before adding one drop of 0.02M AgNO3. Determine acidity by touching tiny quantities of the test solution to blue litmus paper until the litmus turns red. If precipitate forms then Cl- is present. * Test
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1. Atomic masses are expressed on a scale based on the mass of what? Carbon-12 2. Name the unit used to express atomic masses of individual atoms. Grams or molar mass‚ gmm 3. Define formula mass. Sum of the atomic masses of all atoms in a compound 4. What do we call the number of atoms of an element equal to the number of atoms in exactly 12.0 grams of carbon-12? Mole or Avogadro’s number 5. How many atoms are in a sample of an element whose mass is numerically equal to the atomic
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What is the mass of 7.50 moles of sulfur dioxide (SO2)? 2. How many moles are there in 250.0 grams of sodium phosphate (Na3PO4)? 3. How many grams of potassium sulfate (K2SO4) are there in 25.3 moles? 4. Calculate the number of grams in 3.25-mol of AgNO3 60. 5. What is the volume of 0.38 moles of any gas at STP? 61. 6. Calculate the number of moles in 32.2-L of NH3 7. What is the mass of 51 liters of oxygen gas?
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Chemistry 112: Anion Analysis Page 7 ANION ANALYSIS M uch of the work you will be doing in the Chemistry 112 laboratory will be concerned with identifying positive and negative ions‚ that is‚ cations and anions‚ in solutions whose composition is unknown. This procedure is called QUALITATIVE ANALYSIS. The modern chemist frequently wishes to identify the constituents in a very small amount of substance‚ and so he depends heavily on instrumental methods of analysis. While the procedures
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Title Laboratory Techniques and Measurements Purpose The purpose of this experiment is to determine mass‚ length‚ temperature‚ volume‚ and density of objects and liquids using common measuring devices and algebraic formulas. The metric system‚ the most common set of measurements used in science‚ which includes meters‚ liters‚ Celsius‚ and grams will be used. Procedure The following items were used within the experiment: (1) Metric ruler with centimeter (cm) and millimeter (mm)‚ (1)
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Fusion Solution Soda Lime + Red Litmus Paper No Pungent color solution Red litmus paper did not turn blue No presence of Nitrogen Test for Halogens Beilstein Test Copper wire + Flame No Green flame No presence of Halogen Silver Nitrate Test Heat + AgNO3 No white precipitate No presence of Halogen Test for Sulfur Diluted Acetic Acid + Lead Acetate + Heat No brown precipitate formed No presence of Sulfur Table 6.5Qualitative Tests for Functional Group Test for Alcohol: Chromic Acid Test Sample Treatment
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