Author: Anonymous

Element X reacts with Sodium to form the ionic compound Na2X.  What is element X if its anion has 18 electrons? A. S B. Ar C. Se D. Br    

A photon of infrared light has a ____________________________ wavelength and ______________________ energy than a photon of ultraviolet radiation.   A. Shorter, lower B. Longer, lower C. Shorter, higher D. Longer, higher

What is the oxidation state of manganese in MnO4-? A.  +1 B.  +3 C.  +5 D.  +7

What is the hydroxide ion concentration, [OH-], in a solution with a pH of 8.472 at 25

The equilibrium constant, K, is 2.4 x 103 at a certain temperature for the reaction: 2NO(g) ⇌ N2(g) + O2(g) For which of the following sets of conditions is the system at equilibrium? A.  1.0-L flask contains 0.024 mol NO, 2.0 mol N2, and 2.6 mol O2. B.  2.0-L flask contains 0.032 mol NO, 0.62 mol N2, and 4.0 mol O2. C.  3.0-L flask contains 0.060 mol NO, 2.4 mol N2, and 1.7 mol O2. D. None of these conditions are at equilibrium  

The pH of a 0.25 M aqueous solution of acetic acid, CH3CO2H, is 2.67 at 25

What is the mass of 0.1000 mole of AlCl3

What is the molar concentration of a solution formed by dissolving 300.0 mg of Glucose, C6H12O6, to make 150.0 mL of solution? Molar mass:C6H12O6: 180.18 g/mol   A. 0.360 M B. 11.1 M C. 1.67 x 10-3 M D. 1.11 x 10-2 M

What volume of a 1.25 M aqueous solution of sodium chloride is needed to prepare 100.0 mL of a solution that is 0.25 M? A. 16.0 mL B. 20.0 mL C. 50.0 mL D. 80.0 mL

Which ion has the smallest radius? A. Cl- B. S2- C. Mg2+ D. Na+