Electrons in a metal paper clip don't fly off the surface because
A. they are attracted by an equal number of protons.
B. mutual repulsion is incomplete.
C. they are strongly bonded to their atoms.
D. all of the above
Answer: A
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A needle in a compass in a magnetic field experiences
A. a net force. B. a torque. C. both of these D. none of the above
Which of the following is the largest carbon sinks?
A) the atmosphere B) fossil fuels and oil shales C) dead organic matter D) the oceans
Which of the following reactions will consume the most oxygen?
A) complete combustion of one mole of 2,3-dimethylhexane B) complete combustion of one mole of 2,3,4-trimethylpentane C) complete combustion of one mole of octane D) None, they all consume the same amount of oxygen.
Which of the following is likely the most effective way to increase the use of mosquito nets for their intended purpose?
a. Treat the nets with a more effective pesticide. b. Make the holes in the nets smaller to increase effectiveness. c. Sell fishing nets for a cheaper price. d. Impose fines on those using the nets for fishing.