Exams & Certification

What Is The Molecular Mass Of Br2 ? A) 79.90 Amu B) 79.90 G C) 159.8 Amu D) 159.8 G E) 2.65 X 10-22 Amu 2. What Is The Mass Of 4.50 X 1022 Cu Atoms? A) 7.47 X 10-2g B) 7.47 X 10-2 Amu C) 4.75 G D) 63.55 Amu E) 63.55 G 3.Determine […]

Las dependientas venden algunas blusas. Alguien va de compras al centro comercial. Siempre me cepillo los dientes antes de salir. Te traigo algún programa de la computadora. Mi hermano prepara algo de comer. Quiero tomar algo en el café de la librería. The Correct Answer and Explanation is: Let’s examine the correct pronoun replacements for

Outsourcing and ethics Hollenberry, Inc., is a successful mail-order catalog business with customers worldwide. The company’s headquarters is in a small town some distance from any major metropolitan area. Sales have grown steadily over the years, and the call center facilities are currently inadequate for the sales volume. Management is deciding whether to outsource the

If a compound is reduced, what is the result? Fewer C-H bondsIncreased number of C-H bondsFewer C-Z bondsBoth increased number of C-H bonds and fewer C-Z bonds The Correct Answer and Explanation is: The correct answer is:Both increased number of C-H bonds and fewer C-Z bonds In chemistry, reduction refers to a process in which

Solid ammonium chloride dissociates according to NH4Cl(s) – NH3(g) + HCl(g). The dissociation vapour pressure of NH4Cl at 427 °C is 608 kPa but at 459 °C it has risen to 1115 kPa. Calculate (i) the equilibrium constant, (ii) the standard reaction Gibbs energy, (iii) the standard enthalpy, (iv) the standard entropy of dissociation, all

Predict the pKa value for H2SO4, HSO4 – and SO4 2–. The Correct Answer and Explanation is: Correct Answer: Explanation (300+ words): Sulfuric acid (H₂SO₄) is a diprotic strong acid, meaning it can donate two protons (H⁺) in solution. The acidity of a molecule is quantified using pKa, the negative base-10 logarithm of the acid

Helium (He) Gas discharge tube: Bright line emission spectra viewed through a spectroscope: with Wavelength 400 nm 450 nm 500 nm 550 nm 600 nm 660 nm 700 nm (4pts) Attach your drawing of the helium lamp spectrum here. Neon (Ne) Gas discharge tube: Bright line emission spectra viewed through a spectroscope with Wavelength 650

Babe Ruth was a famous baseball player in the 1920s. He made a salary of $80,000 in 1930, which was considered outrageous because it was more than President Hoover made. Nowadays, baseball players make much more than $80,000; the average major league salary in 2019 was $4 million per year, and the highest salary paid

Draw the structure of an eight-carbon alkene that would yield the following compound (and no others) after treatment with ozone followed by dimethyl sulfide. The Correct Answer and Explanation is: Problem Restatement: You are given a compound (not shown here, but presumably a specific product of ozonolysis), and you want to draw the structure of

Solution Stoichiometry: Please answer all questions, showing work. A. What volume of 0.175 M Na3PO4 solution is required to completely react with 126mL of 0.150 M 0.102 M CuCl2? 2 Na3PO4 (aq) + 3 CuCl2 (aq) -> Cu3(PO4)2 (s) + 6 NaCl (aq) B. What is the Molarity of ZnCl2 that forms when 25.0 g