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exam 3 review
| Question | Answer |
|---|---|
| the melting of snow above 0℃ | increases the entropy of the universe |
| the evaporation of water from a desk at room temperature | increases the entropy of the universe |
| the cooling of a hot cup of coffee in room temperature air | increases the entropy of the universe |
| Which process increases the entropy of the universe? A. the melting of snow above 0℃ B. the evaporation of water from a desk at room temperature C. the cooling of a hot cup of coffee in room temperature air D. all of the above | D. all of the above |
| Which statement is true for the freezing of liquid water below 0℃? A. ΔH is (+); ΔS is positive; ΔG is positive B. ΔH is (+); ΔS is negative; ΔG is negative C. ΔH is (+); ΔS is negative; ΔG is positive D. ΔH is (-); ΔS is negative; ΔG is negative | D. ΔH is negative; ΔS is negative; ΔG is negative REASON: The freezing of water is an exothermic process (ΔH is negative). Ice is more ordered than liquid water (ΔS is negative). The freezing of water is spontaneous below 0℃ (ΔG is negative). |
| If ΔH is negative; ΔS is negative; and ΔG is negative then what statement is true about water? A. water is ice, frozen, Rtx is spontaneous B. water is Ice, Rtx is not spontaneous C. water is a liquid but Rtx is spontaneous | A. water is ice, frozen, Rtx is spontaneous |
| If K<1, then ΔG is: A. Positive B. Negative C. Cannot be determined | A. Positive |
| If K>1, then ΔG is: A. Positive B. Negative C. Cannot be determined | B. Negative |
| If K>1, then the reaction is: A. product favored B. Reactant favored C. Cannot be determined | A. product favored |
| If K<1, then the reaction is: A. product favored B. Reactant favored C. Cannot be determined | B. Reactant favored |
| What reactions are more favored by the natural environment? A. (+)ΔH, and (+)ΔS B. (-)ΔH, and (-)ΔS C. (-)ΔH, and (+)ΔS D. none of the above | C. (-)ΔH, and (+)ΔS |
| If ΔG is negative then: A. The reaction is spontaneous B. The reaction is not spontaneous C. Cannot be determined | A. The reaction is spontaneous |
| If ΔG isn't negative then: A. The reaction is spontaneous B. The reaction is not spontaneous C. Cannot be determined | B. The reaction is not spontaneous |
| If ΔG isn't positive then: A. The reaction is product favored B. The reaction is reactant favored C. Cannot be determined | A. The reaction is product favored |
| If ΔG is positive then: A. The reaction is product favored B. The reaction is reactant favored C. Cannot be determined | B. The reaction is reactant favored |
| If ΔH is negative then | |
| If ΔH is Positive then | |
| which metal does not dissolve in hydrochloric acid (HCl)? Zn Cd Cu Fe | Any metal with a reduction potential below 0 V dissolves in HCl. Copper is the only element in this list with a E° above 0 V (+0.34 V). |
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jozefen
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