8. Which of the following shows the reaction associated with the standard format

Question

8. Which of the following shows the reaction associated with the standard formation of a compound? heat of 7. Which of the following is an endothermic process (the system is n- a. dry ice subliming b. water freezing c. iodine vapor depositing on a cool d. propane burning e. water condensing on a cold glass 8, which one of the following is characteristic of an oxidizing agent? a. An oxidizing agent loses electrons b. Metals in their elemental form, like Fe, are good axidizing agents c. The oxidation number of an oxidizing agent increases following a redox d. An oxidizing agent causes another species to be reduced e. Metals with high oxidation state, such as care good aiding agents 9. In terms of activity, the series for metals is found to be, Cs > Na> Mg>Al> Zn>Cd> Sn>Cu > Ag> Au Which reaction below (as written) is expected to yield "no reaction"? a. Sn+2 + Mg(s) C. Zn(s) + Cu(NOablaq) e. Al(s) + AgNO!aq) 10. Which of the following correctly portrays how the majority of HNO,(ag) and HC2H 02 (aq) molecules exist in solution? a. H NO, and H CH6O2 b.H NO, and HC,HyO2 (aq) c HNO(aq) and H + C2H,02 d. HNO-(aq) and HC,HO2 (aq) e. Halag)+NO," and CaHO2

Explanation / Answer

6)

for standard heat of formation,

rule 1: reactants should be elements in there standard state.

rule 2: only one mol of product should be formed

a is not correct because CaO or CO2 are not elements

b is not correct because 2 moles of product are being formed

c is not correct because CO is not element

d is not correct because 2 moles of product are being formed

e is correct

Answer: e

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