In which of the following classes of organic compounds is an oxygen atom bonded to a hydrogen atom?
A) aldehydes
B) carboxylic acids
C) ketones
D) all of these
B
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A hypothesis is ________
A) a prediction about something that has not yet been observed B) the design of an experiment that can be used in scientific inquiry C) a statement that explains an observed phenomenon or answers a question D) a proven scientific fact
The Green Revolution depends on several factors for success. What is NOT one of those?
A) machinery B) new seeds C) chemical fertilizers D) small-scale farming E) all of the above are factors needed to succeed
How do waves propagate across the water?
A. the wave moves forward but water moves in a circular motion B. water within the wave travels as far as the wave does C. water near the surface moves less than water at depth D. All of these choices are correct.
For the last 100 years, our primary energy source has been ________
A) nuclear energy B) natural gas C) hydropower D) fossil fuels E) fuel wood