Worked solutions to student book questions Chapter 2 Analysis by mass Q1. a b Why was the soup sample in Worked Example 2.1 heated to 110°C? Why was it necessary to weigh the sample four times? A1. a b The soup was heated above 100°C to evaporate water from the sample. By repeatedly heating the sample until the mass remained unchanged‚ the analyst could be sure that all the water had been removed. Q2. Some laboratories use microwave ovens in place of conventional ovens to
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Names of the Elements Name: Period: Hint: If you need help go to: http://periodic.lanl.gov/default.htm What elements were named after the following astronomical bodies? Sun Mercury Earth Moon Asteroid Pallas Asteroid Ceres Uranus Neptune Pluto What elements were named regarding their taste or odor? Sweet (Latin) Odor (Greek) Stench (Greek) What elements were named after the following places? Berkeley‚ California State of California The Americas France (2 elements)
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Identification and Production of Materials ================================ Ethene‚ Polymers and Ethanol ================================ Catalytic Cracking Oil refineries need to balance their outputs of various products (petrol‚ diesel‚ fuel oil‚ etc.) to match the demands of the marketplace. Catalytic cracking is the process in which high molecular weight (high boiling point) fractions from crude oil are broken into lower molecular weight (lower boiling point) substances in order to increase
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Biochemistry and Technology 8.06 What specific topic did you choose to research and evaluate? (2 points) -I chose genetic engineering/recombinant DNA technology/transgenesis of biotechnology to research and evaluate because that interests me the most‚ personally. List the resources that you used in your research of your topic. (3 points) - I used sites such as‚ wikipedia.org‚ and slideshare.net. Describe‚ in a few paragraphs‚ the biotechnology that you researched. How is it currently
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NAME Dr. Harvey English 201 April 9‚ 2014 “Youthful Indiscretions: Should Colleges Protect Social Network Users from Themselves and Others?” As an attorney specializing in labor and employment and higher education law‚ Bostonian‚ Dana L. Fleming wrote an article entitled‚ “Youthful Indiscretions: Should Colleges Protect Social Network Users from Themselves and Others? The article was published in the Winter 2008 The New England Journal of Higher Education. In 2008‚ two social networking sites
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1 - What are the coefficients for the reactants and the products when the equation for the reaction: Ca(OH)2 (aq) + HNO3 (aq) → Ca(NO3)2 (s) + H2O (ℓ) is balanced? 1‚ 4‚ 2‚ 4 1‚ 2‚ 1‚ 2 1‚ 1‚ 1‚ 2 None of the above 2 - The mass in grams of two moles of iron atoms is: 26.00 g 55.847 g 111.69 g 27.923 g 3 - The formula mass of nitric acid is given by: 31.50 g/mol 17.03 g/mol 63.01 g/mol 126.02 g/mol 4 - Sodium oxide has the formula: Na2O Na2O2 NaO2 Na4O2 5 - The
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Calorimetry 1. How many calories would it take to raise the temperature of 200 g of water 100oC? 2. It takes 23.5 J to raise the temperature of 10.0 g of silver by 10oC. What is the specific heat of silver? 3. A 255 g quantity of gold is heated from 28oC to 100oC. How many joules of energy were used? (specific heat of gold = 0.13 J/goC) 4. What will be the final temperature of 5.00 g of silver at 37oC if it gives off 25.0 J of heat to the surroundings
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Question 1 Consider the following equilibrium.4NH3(g) + 3O2(g) | View Full Image | | 2N2(g) + 6H2O(g)Suppose 0.30 mol of NH3 and 0.40 mol of oxygen are added to a 5.0-L container. If x mol of water is present at equilibrium‚ what is the equilibrium concentration of oxygen?Answer 0.40 - 0.50x | 0.30 - 0.50x | 0.08 - 0.10x | 0.06 - 0.13x | 0.40 - | View Full Image | | x | 4 points Question 2 At 298 K‚ the value of Kc for the reaction
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a substance that conducts an electric current when dissolved in water is called an electrolyte a non-electrolyte is a substance that does not conduct an electric current in aqueous solution NH4+‚ NO3-‚ and group 1A cations are ions that always form soluble ionic compounds a precipitation reaction is a reaction in which two or more water-soluble ionic compounds react in aqueous solution to form one or more insoluble precipitates. a precipitate is a solid that separates from a solution a species
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pleasant odour and flavour. The objective of this experiment was to carry an organic synthesis; the preparation of salicylic acid from methyl salicylate. To do an organic synthesis‚ it is needed to chemically modify the molecules of another compound to end up with the desire compound. Methyl salicylate is the major constituent of wintergreen oil‚ which is why it was used in this experiment as the starting material. The new technique used in this experiment is heating under reflux. Many organic compounds
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