A particular chemical reaction carried out at 20°C takes 2 hours. Approximately how long will it take to carry out the reaction at 40°C?
A) 0.5 hour
B) 1 hour
C) 4 hours
D) 8 hours
A
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Which of the following contains the most freshwater?
A. aquifers B. streams C. lakes D. rivers
What is the direction of the pressure gradient force during a reversible adiabatic process, in relation to the isobars?
A. perpendicular B. pointing to the left of the isobars C. parallel D. pointing to the right of the isobars
Barrier islands are:a
perpendicular to the shore. b. formed when sediments accumulate on submerged rises. c. broad and offshore d. connected to the shore.
If a river originates 200 meters above sea level and travels 100 kilometers to the ocean, what is the average gradient in meters per kilometer?
A) 0.2 meters per kilometer B) 0.5 meters per kilometer C) 2 meters per kilometer D) 5 meters per kilometer E) None of these are correct.