Which reaction below represents^232_90 Th decay by alpha emission?^232_90 Th rig
ID: 1000921 • Letter: W
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Which reaction below represents^232_90 Th decay by alpha emission?^232_90 Th rightarrow^4_2 He +^228_88 Ra^232_90 Th rightarrow^2_4 He +^230_86 Ra^232_90 Th rightarrow^1_1p +^231_89 Ac 232_90 Th rightarrow^1_0n +^231_90 Th The reaction Cu(s) + 2 AgNO_3(aq) rightarrow Cu(NO_3)_2(aq) + 2 Ag(s) is best classified as a(n) acid-base neutralization reaction. double replacement reaction. oxidation-reduction. Precipitation reaction. What is the molar concentration of sodium ions in a 0.350 M Na_3PO_4 solution? 0.117 M 0.350 M 1.05 M 1.40 M What is the molecular geometry of BrF_4^-? Seesaw square planar square pyramidal tetrahedral In the reaction AgNO_3(aq) + HI(aq) rightarrow Agl(s) + HNO_3(aq) the spectator ions are Ag^+ and NO_3^- Ag^+ and I^- H^+ and I^- H^+ and NO_3^- Which species functions as the oxidizing agent in the following reduction-oxidation reaction? 5 Fe^2+(aq) + MnO_4^-(aq) + 8 H^+(aq) rightarrow Mn^2+ (aq) + 5 Fe^3+ (aq) + 4 H_2O(l) Fe^2+ (aq)Explanation / Answer
30. A) is correct answer. Since alpha particle is nothing but Helium (2He4)
31. C) is correct answer. Cu(s) --> Cu2+ + 2e; Ag+ + e --> Ag(s), here oxidation occurs at Cu & reduction occurs at Ag+
32. C) is correct answer.The first thing to realize is that the dissolution of the Na3PO4 can be written in a format that may be easier to see what is happening here.
Na3PO4 ----> 3 Na(+) + PO4(-3)
Now, you are starting out with a 0.35 M solution of Na3PO4, but when you dissolve the Na3PO4 into solution there are 3 Na(+) ions made for every Na3PO4 molecule that dissolves. Therefore to calculate the concentration of Na(+) ions in the final solution, take 3 times the inital concentration. 0.35 * 3 = 1.05 M in Na(+)
33. B) square planar is correct answer
34. D) is correct answer. Spectator ions always appear in both sides as ions in aqueous media
35. D) MnO4-(aq) is correct answer. In this Mn is in +7 state then it changes to Mn2+. An oxidizing agent is defined as which oxidizes (removes electrons from other substance) other compound and itself reduces
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