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19 Nov 2019
Identify the base in the following acid-base reaction. H_2PO^-_4 (aq) + H_2O (l) rightarrow HPO^2-_4 (aq) + H_3O^+ (aq) a. H_2O b. You can't determine without a titration c. H_2PO^-_4 d. H_3O^+ e. This is not an acid-base reaction Which of the following lasers emits photons with the lowest energy? a. an Ar^+ laser with lambda = 514.5 nm b. a He-Ne laser with lambda = 633 nm c. a Kr^+ laser with lambda = 647 nm d. a Nd: YAG laser with lambda = 1064 nm e. an ArF laser with lambda = 193 nm Which of the following statements about energy, systems, and surroundings is NOT true? a. The system can do work on the surroundings. b. The surroundings can provide thermal energy to the system. c. The system can be a chemical reaction that occurs in a sample of matter. d. The system is the part of the universe that is the focus of thermochemical study. The surroundings experience the same energy change as the system in order to keep total energy in the universe constant. Bond length and bond strength are ______ a. arbitrary. b. unrelated. c. inversely proportional. d. identical. e. directly proportional. Which type of bonding involves the sharing of valence electrons by two atoms? a. polar ionic b. metallic c. covalent d. ionic e. intramolecular
Identify the base in the following acid-base reaction. H_2PO^-_4 (aq) + H_2O (l) rightarrow HPO^2-_4 (aq) + H_3O^+ (aq) a. H_2O b. You can't determine without a titration c. H_2PO^-_4 d. H_3O^+ e. This is not an acid-base reaction Which of the following lasers emits photons with the lowest energy? a. an Ar^+ laser with lambda = 514.5 nm b. a He-Ne laser with lambda = 633 nm c. a Kr^+ laser with lambda = 647 nm d. a Nd: YAG laser with lambda = 1064 nm e. an ArF laser with lambda = 193 nm Which of the following statements about energy, systems, and surroundings is NOT true? a. The system can do work on the surroundings. b. The surroundings can provide thermal energy to the system. c. The system can be a chemical reaction that occurs in a sample of matter. d. The system is the part of the universe that is the focus of thermochemical study. The surroundings experience the same energy change as the system in order to keep total energy in the universe constant. Bond length and bond strength are ______ a. arbitrary. b. unrelated. c. inversely proportional. d. identical. e. directly proportional. Which type of bonding involves the sharing of valence electrons by two atoms? a. polar ionic b. metallic c. covalent d. ionic e. intramolecular
Jarrod RobelLv2
26 Aug 2019