Given that the reaction 2 H2(g) + O2(g) ? 2 H2O(g) is exothermic, which of the following is true of the reaction 2 H2O(g) ? 2 H2(g) + O2(g)?
A) Its activation energy is lower than that of 2 H2(g) + O2(g ) ? 2 H2O(g).
B) Its activation energy is the same as that of 2 H2(g) + O2(g ) ? 2 H2O(g).
C) Its activation energy is higher than that of 2 H2(g) + O2(g ) ? 2 H2O(g).
D) There is no relationship between its activation energy and that of 2 H2(g) + O2(g ) ? 2 H2O(g).
C
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A caldera similar to this one filled with water to become Crater Lake in Oregon (42°56'42"N, 122°06'01"W; see Figure 35-2). Why isn’t the Okmok Caldera presently filled with water?
The question is based on Map T-2, the “Umnak, Alaska,” topographic map (scale 1:250,000; contour interval 200 feet), Map T-21b, a satellite image; and Figures 35-3 and 35-4, a shaded relief map and a stereogram showing the Okmok Caldera (53°25'33"N, 168°07'38"W) on Umnak Island in the Aleutian Islands. What will be an ideal response?
Which law relates the pressure and temperature of a gas under conditions of constant volume?
A) Boyle's law B) Charles's law C) Dalton's law D) Gay-Lussac's law
The ultimate base level for most stream action is _____
a. the floodplain b. the interfluve c. sea level d. the water table e. the mountain range where the headwaters begin
Which of the following is TRUE relative to insolation at the thermopause relative to latitude?
A) Insolation can only be measured longitudinally, not latitudinally. B) Annually, higher latitudes receive more insolation than lower latitudes. C) Annually, insolation is evenly distributed with little change by latitude. D) Annually, lower latitudes receive more insolation than the higher latitudes.