How it works with aniline as example? Our chemistry experts are ready to help. 2Mg(s) + O_2(g) \to 2MgO(s) How many moles of magnesium are needed to react with 3.0 mol of O_2? Write a balanced equation and indicate the type of reaction for ammonium nitrite into nitrogen and water. Calculate the K_sp for PbBr2 if its molar solubility is 2.14 times 10^(-2) M at 25 degrees C. Write the solubility constant expression for the following species. A) MnS B) Al(OH)3 C) Ca3(PO4)2. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. Select true if the molecule exhibits trigonal bipyramidal electron geometry. CH141 Exam II 2016 with Answers. 2. What errors could have been encountered while performing the qualitative analysis of cations in solution? True or false? Which branch of chemistry studies the composition of substances? Explain what chemophobia is, the "symptoms", and how you would help people who are afflicted better understand the importance of chemistry. How many milligrams of hydrogen d... O2 is generated into a 250 mL beaker by water displacement at a pressure of 730 torr and a temperature of 25 degrees Celsius. 10.0 cm^3 of an aqueous solution of sodium hydroxide of pH = 10 is mixed with 990.0 cm^3 of distilled water. Most questions answered within 4 hours. Go ahead and ask it. What is the half-life of bismuth-210 if 9.41 days are required for the mass of a sample of bismuth-210 to fall to 27.2 percent of its original value? A mass of 5 kg of saturated liquid vapor mixture of water is contained in a piston-cylinder device at 125 kPa. Why do you think it is important to have a basic understanding of chemistry in your study of Anatomy and Physiology and in turn, your study of Exercise Science? The pH of a solution is 1.48. Calculate the work (w) and ΔEo, in kJ, at 298 K and 1 atm pressure, for the combustion of one mole of C3H8 (g). When 22.0 g of NaOH and 21.0 g of H_2SO_4 are mixed and react according to the the reaction 2NaOH + H_2SO_4 \to Na_2SO_4 + 2H_2O. Write the chemical equation, the ionic equation and the net ionic equation for the reaction between barium hydroxide and hydrochloric acid. How much NaHCO3 (in grams and moles) is needed to make 210.0 mL of a 0.130 M solution? Practice Final Exam Problems. At STP, the molar volume of an ideal gas is 22.4 L/mol. What would be the difference in 60 MHz field? C + 2H2 arrow CH4 b. Virtual Office Hours for General Questions. The Ksp of barium chromate is 2.0 x 10-10. CHEM1110 Test Bank of Old Quizzes and Exams. The atmospheric pressure in the laboratory is measured to be 771.5 torr. A solution was made by dissolving 12.5 g of Na3PO4 in 125.00 mL of water. When there are extra electrons available in a Lewis structure, they: A. are used to make double bonds in the molecule. If 15.0 mL of a 0.200 M NaOH solution is required for neutralization of 5.0 mL of given HCl solution, then, what is the molarity of the HCl solution? a) 8 b) 9 c) 11 d) 12, Write the molecular, total ionic, and net ionic equations for the following reactions: (a) Ca(OH)2(aq) + HC2H3O2(aq) rightarrow (b) H3PO4(aq) + CaCl2(aq) rightarrow. It has a molar mass of 62.07 g/mol. The mass of the gas generator after the reaction was 87.642 grams. What is the molecular geometry of PBr3? What is standardization? Explain why increasing the concentration of sodium thiosulfate in solution in the presence of hydrochloric acid will increase the rate of reaction of the mixture? (Ksp = 2.45 x 10-5). Which of the following substance can be used to make a buffer with NaHCO3? What would be the (H3O+)? What is the molar mass of a hydrocarbon if 5.19 x 1016 molecules of the hydrocarbon weigh 5.00 mu g? If 10 grams of N2 is added to the container, the pressure increases to 1.0 at... At 29 degrees Celsius and 756 torr, a gas occupies 2.50 L. If the temperature is increased to 159 degrees Celsius and the pressure is increased to 1550 torr, what volume does the gas occupy? A laboratory group measures an excess of a volatile liquid. If the dissociation constant of a weak acid is 7.9 x 10-5, at what ratio should you adjust the concentration of the weak acid and its conjugate base in order to prepare a buffer that has a pH of 4.... A 1.13-gram sample of lauric acid (C12H24O2), a common constituent of fats, is burned in a bomb calorimeter. c. What is the hydroxide ion concentration in this solution? When heating, why should you heat the evaporating dish gently and intermittently? 7.4 c. 7.0 d. 6.8 e. 6.6. Balance the following reaction: NO2 + H2O + O2 arrow HNO3. What is the molarity of a solution made by dissolving 26.42 g of (NH4)2SO4 ...in enough water to make 50 mL of soluti. Pb(OH)42-(aq) + ClO-(aq) arrow PbO2(s) + Cl-(aq) (basic solution), Balance the following equation, and identify the oxidizing and reducing agents.
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