Suppose you have a choice of fuels to use to heat your home. Which CO2 source produces the least carbon per unit of energy?
A. Natural gas
B. Oil
C. Coal
Answer: A
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Mafic igneous rocks are silica-poor.
Answer the following statement true (T) or false (F)
An isotope's half-life is equal to the time it takes ________.
A. half of the electrons in its outer most shell to be covalently bonded with oxygen B. half of the neutrons to be converted into protons C. half of the parent atoms to decay into daughter atoms D. nuclear fission to begin once the isotope first forms E. a one gram mass of parent atoms to disintegrate into one gram mass of daughter atoms
How many micrograms (mg) are there in 1 milligram (mg)?
A) 1 x 10^- 6 B) 1 x 10^-3 C) 1 x 10^3 D) 1 x 10^6
An intern made an error and gave a patient a dose of 500 mg rather than 500 mg of a drug. Which of the following is true?
A) the patient received an overdose by a factor of 1000 B) the patient received an overdose by a factor of 100 C) the patient received an underdose by a factor of 1000 D) the patient received an underdose by a factor of 100