When an atom of Uranium-238 undergoes alpha decay, it becomes ____
A)U-234
B)U-236
C)Th-234
D)Th-236
E)Th-238
C
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Water, H2O, and methane, CH4 have about the same mass and differ by only one type of atom. Why is the boiling point of water so much higher than that of methane?
A) The water molecule is less symmetrical than is the methane molecule. B) The oxygen of a water molecule has two lone pairs of electrons. C) The electronegativity difference between oxygen and hydrogen is greater than the electronegativity difference between carbon and hydrogen. D) all of the above
What is the texture of this rock?
A) Schistosity B) Nonfoliated C) Slaty cleavage D) Gneissic banding
Hydrofluoric acid, HF, is a weak acid. Which of the following is the correct expression for the Ka of hydrofluoric acid?
A) [H3O+][HF]/[F-] B) [HF]/[ H3O+][F-] C) [H3O+][F-]/[HF] D) [HF][F-]/[ H3O+]
Which of the following practices contributes the least to antibiotic or pesticide resistance?
A. A person takes the full course of the appropriate antibiotic when she has a viral infection. B. A person takes the full course of the appropriate antibiotic when she has a bacterial infection. C. Domestic farm animals are fed low doses of antibiotics to increase weight gain. D. Mosquito populations in the tropics have been sprayed with DDT for about 50 years. E. A person takes an anti-malarial drug when he does not have malaria.