If a lake is about an eighth covered by water hyacinths when you first look at it, and completely covered 3 weeks later, what is the water hyacinth doubling time?
a. 0.25 week
b. 0.5 week
c. 1 week
d. 2 weeks
e. 3 weeks
C
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The current drawn by a 1200-W toaster connected to 120 V is 10 A. The resistance of the toaster coils is
A) 6 ohms. B) 12 ohms. C) 18 ohms. D) none of the above
In a smoke detector americium (A = 95) transmutes to neptunium (A = 93) by
A) beta emission. B) alpha emission. C) gamma emission. D) none of the above
A fluid can be:
a. a liquid but not a solid or a gas. b. a solid but not a liquid or a gas. c. a gas but not a liquid or a solid. d. a gas or a liquid but not a solid. e. a liquid or a solid but not a gas.
Where would the aluminum form?
For the following electrolysis reaction: 2 AlOF3-2 + C ? 2 Al + CO2 + F- A) cathode B) anode C) in solution D) Aluminum formation does not happen because electrons do not flow in above reaction. E) none of the above