In an experiment to prepare aspirin, the percent yield was 94.3% g. If the actual yield was 124.3 g, what was the theoretical yield for this experiment?
A) 94.3 g
B) 117 g
C) 132 g
D) 234 g
C
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On average, what percentage of solar energy striking the outer atmosphere eventually reaches Earth's surface?
a. ?5 percent b. ?15 percent c. ?30 percent d. ?50 percent e. 70 percent?
As indicated in this image, when different species of warblers inhabit the same area, is food competition reduced?
What will be an ideal response
Oceanographers are studying the thermohaline currents to determine ________
A) whether global climate change may slow or alter their path B) whether fresh water is more dense than saltwater C) whether they could be replaced with artificial currents if damaged by changing temperatures D) if warm water from polar and glacial melt is affecting the chemistry of the currents E) whether they are becoming more acidic
Which of the following exhibits primary succession?
A. a rock exposed by a retreating glacier B. an abandoned farm C. a clear-cut forest D. newly flooded land E. a recently burned forest