Which of the following polyatomic ions has a doubly negative charge?
a. Acetate
b. Sulfate
c. Phosphate
d. Ammonium
b
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Answer the following statement true (T) or false (F)
Earth's magnetic field is
A) something we've learned to live with. B) useful to pigeons but not to humans. C) protective to life on Earth.
A tiny 0.0250-µg oil drop containing 15 excess electrons is suspended between two horizontally closely-spaced metal plates that carry equal but opposite charges on their facing surfaces
The plates are both circular with a radius of 6.50 cm. (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C) (a) How much excess charge must be on each plate to hold the oil drop steady? (b) Which plate must be positive, the upper one or the lower one?
In the standard model, about when after the Big Bang did the universe become transparent to radiation?
A) 10-43 s B) 10-35 s C) 103 s D) 3 × 105 y E) 3 × 106 y