OH

HBr (1 equiv) H₂O2 ✓

My courses 20203 الفرع الرئيسي العلو كيمياء عامة )1( نظري - طولكرم General hemistry 101 Exam کيمياء عامة )1( نظري Match each of the following with its correct answer The following reaction is : CH,OH ) + 3/2 O, → CO, + 2H,0 + 726.4 kJ 2(g) (1) Choosm. Choose... directly endothermic exothermic inversely Based on Charles law, the volume occupies by any sample of gas at a constant pressure Is .......... proportional to the absolute temperature Choose... Based on Grahams law, the rate of effusion of the gas is proportional to the square root of the molar mass Choose...

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A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of carbon tetrachloride, diethylamine, pentane, acetone, and tetrahydrofuran. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from his collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: liquid density - 3 1.6 g·cm carbon tetrachloride diethylamine - 3 0.71 g·cm pentane 3 0.63 g cm 3 0.79 g cm acetone tetrahydrofuran - 3 0.89 g cm Next, the chemist measures the volume of the unknown liquid as 1.427 L and the mass of the unknown liquid as 894. g. Calculate the density of the liquid. Round 3 your answer to 3 significant digits. |lg.cm Given the data above, is it possible to identify the liquid? yes no carbon tetrachloride diethylamine If it is possible to identify the liquid, do so. pentane acetone tetrahydrofuran

CH₂-COOH Citric acid has the formula HO-C-COOH I CH₂-COOH CH2–CDD - Na* + HD-C-CDD- Na CH₂-COO- COO-Na A 25.0 mL sample of a concentrated citrus fruit cordial component (e.g. for lime juice), used in the food & drinks industry, was diluted to 250 mL in a graduated volumetric flask. A 25.0 mL sample of this diluted solution, required, on average, 22.5 mL of a standard 0.100 molar sodium hydroxide solution using phenolphthalein indicator for the titration end-point. A) 0.0075 Assuming all the acid in the cordial was citric acid, calculate the concentration of the acid in g/mL in the original solution. B) 0.576 D and is tribasic acid, forming the tri-sodium salt on complete neutralisation with sodium hydroxide. 1.44 0.00225

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A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of glycerol, ethanolamine, pentane, tetrahydrofuran, and dimethyl sulfoxide.   The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from her collection of Material Safety Data Sheets (MSDS), the chemist finds the following information:

A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of diethylamine, pentane, acetone, carbon tetrachloride, and tetrahydrofuran. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from her collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: liquid density g 0.71 mL diethylamine olo Ar pentane 0.63 mL g 0.79 mL acetone g 1.6 mL carbon tetrachloride g 0.89 mL tetrahydrofuran

A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of acetone, ethanolamine, carbon tetrachloride, methyl acetate, and pentane. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from her collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: Next, the chemist measures the volume of the unknown liquid as 0.940 L and the mass of the unknown liquid as 663. g.