Which of the following is true when H+ and O2 combine to produce two molecules of water?
A) Two electrons are consumed and the reaction is endothermic.
B) Two electrons are consumed and the reaction is exothermic.
C) Four electrons are consumed and the reaction is endothermic.
D) Four electrons are consumed and the reaction is exothermic.
D
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The air inside a room is at a temperature of 70°F and has a mixing ratio of 7.6 g/kg. After reaching saturation, if the temperature of the room continues to decrease for one more hour, how many grams of water vapor (per kg of air) will have had to condense out of the air to maintain a relative humidity of 100%?
What will be an ideal response? __________ g/kg
One of the chief issues with climate change is that
A) climate can change on more than one scale. B) there is not enough data available to build a reliable climate. C) climate change is spatially consistent. D) data are too sparse to develop climatic trends.
Thousands of cases of lung cancer occur in a two-year period in a city outside of Kentucky, at rates that are double that seen in other cities in the United States. Scientists working in that region assume that
A) there is something unique to the region that causing these unusually high rates. B) the medical reports from the area are incorrect. C) government policies and regulations are most likely the cause of this increase in cancer. D) this is most likely just an unlucky occurrence.
In many countries, total fertility rate is at or below the replacement rate. Do the benefits outweigh the costs when populations remain stable or decline?
a. Yes. Individuals will have more access to limitednatural resources and a higher quality of life. b. No. There will eventually be a lack of suitableresources to care for the aging population. c. No. Fewer individuals in a population means less brainpower to tackle society’s toughest challenges. d. Yes. This trend indicates that women have better access to education and resources for familyplanning.