completes the statement or answers the question. ____ 1. The molar mass of copper(II) sulfate pentahydrate‚ CuSO4.5H2O‚ is a. 245.6 g/mol d. 241.5 g/mol b. 177.5 g/mol e. 249.6 g/mol c. 219.2 g/mol ____ 2. A 100.0-g sample of a compound is composed of 16.3 g of carbon‚ 32.1 g of chlorine‚ and 51.6 g of fluorine. The empirical formula of the compound is a. CClF d. C3Cl2F6 b. CClF3 e. C9Cl6F18 c. C2Cl2F6 ____ 3. A compound has a molar mass of 170.0 g/mol and an empirical formula of SiF3. The compound’s
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Xylose is a compound that has five carbon atoms in each molecule and contains 40% carbon by mass. What is the molar mass of xylose? A. 30 B. 67 C. 150 D. It cannot be determined without further information. Question 3 (2009) A student is to accurately determine the concentration of a solution of sodium hydrogencarbonate in a titration against a standard solution of hydrochloric acid‚ HC1. The first step in this experiment is to accurately dilute 100.0 mL of a 1.00 M HCl stock solution to a
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Instructions You must SHOW WORK AND PROBLEM SET-UP for CREDIT. You have to SUPPORT your answers by calculations and/or reasoning. If you do not understand something in the assignment or are not sure how to approach a question - EMAIL me before you submit. This assignment must be submitted no later than November 22nd‚ 2011. 1. What is a true solution? Explain why the solute does not settle out of a solution. Is it possible to have one solid dissolved in another? Explain. In metals it would
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Acid Attack 4 women in their early 20s were attacked by a 41 year old mentally unstable woman. On September 18‚ 2017 there was an acid attack at the train station in Marseilles. ( Which is in southern France). The women that were attacked by acid are Courtney Siverling‚ Charlotte Kaufman‚ Kelsey Kosten‚ and Michelle Krug. The kind of acid that was used was hydrochloric acid. The hydrochloric acid was brought in a DIY store and was sprayed form a spray canister. They were attacked by a mentally
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caused when someone’s stomach produced excess amounts of gastric acids. One of the abundant acids is Hydrochloric Acid (HCl); this acid has a pH level of 1. When there is too much acid in our stomach‚ it rises up to the esophagus‚ which causes the burning sensation known as heartburn. You can treat this if you take antacids‚ antacids are mild bases that can help neutralize the stomach and ends heartburn. GENERAL NEUTRALIZATION EQUATION: Acid + Base = H2O + NaCl HCl + NaOH = water + salt Purpose
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Scientific Paper on Diffusion 2 ABSTRACT The effect of molecular weight on the rate of diffusion was assessed using two tests: the glass tube test and the agar-water gel test. In the glass tube set-up‚ two cotton plugs soaked in two different substances (HCl and NH4OH) were inserted into the two ends of the glass tube. The substance with the lighter molecular weight value (NH4OH‚ M = 35.0459 g/mole) diffused at a faster rate (dAve = 25.8cm)‚ resulting in the formation of a white ring around the
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1874‚ Dresden‚ Germany- Salicylic acid was first made and sold as a pain-killer‚ but it caused severe irritation of the mouth‚ gullet and the lining of the stomach. Salicylic acid (2-Hydroxybenzoic acid) 1875- Chemists made sodium salicylate for doctors to try on patients. It was found to have fewer
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xH2O) Research Question: What is the percentage composition and the amount (in moles) of water in the given ionic hydrate? (Na2CO3.xH2O) Background Information: Sodium Carbonate also known as Washing Soda (Na2CO3.xH2O) is a sodium salt of carbonic acid. Sodium carbonate is domestically well known for its everyday use as a water softener. It is also used to remove grease‚ oil and wine stains. It can be extracted from the ashes of many plants. It is synthetically produced in large quantities from
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Chemistry Lab Report Stoichiometry Design Experiment Percentage Yield of Calcium Carbonate and HCl I. Background Information When marble chips and hydrochloric acid are added together‚ they form sodium chloride‚ water‚ and carbon dioxide. This reaction can be displayed by the balanced equation below; CaCO3 (s) + HCl (l) NaCl(s) + H2O(l) + CO2 (g) As the carbon dioxide is formed‚ it will leave the open beaker as a gas. This will result in a loss of mass. The mass change can then be
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experiment‚ we will standardize acid and base solutions. In this experiment‚ the students to students will be able to know the proper way of preparing solutions from solid and liquid reagents by using the proper pieces of glassware and equipment and to calculate the exact concentration of the prepared solution from standardization. PROCEDURE The reagents that were used in this experiment were concentrated hydrochloric acid‚ sodium hyrdoxide‚ sodium carbonate‚ potassium acid phthalate and phenolphthalein
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