The specific rotation of a compound is defined as the observed rotation of the compound when its concentration is 1 g/mL in a sample tube which is 10 cm long. If a certain compound is observed to have a specific rotation of +8.0°, what rotation will be observed if the sample concentration is 0.25 g/mL and the sample tube is 20 cm long?
A) +2°
B) +4°
C) +16°
D) +32°
B
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Which of the following would not be a good idea in an area that has a high risk for earthquakes?
A) Construct all new buildings using rigid concrete or masonry B) Keep enough food and water for 72 hours in an easily carried backpack C) Have hospitals install computerized earthquake warning systems that will shut down natural gas systems and turn on back-up generators D) Require that new buildings be built to flex easily E) All of these would be a good idea.
Gyres tend to collect seaweed and trash as their centers
a. True b. False
According to the "hygiene hypothesis," to reduce the chances of developing asthma, people raising children in
A) developing countries should keep their children away from farm animals. B) developing countries should try to raise their children in cities. C) cities in developed countries might want to have a pet dog or cat. D) rural parts of developed countries should not have dogs or cats.
Plate Tectonic boundaries were first identified by ________
A) mapping earthquakes and volcanoes B) mapping continental margins C) mapping the mountain chains D) mapping subduction zone