Give the formula, including the ionic charge, for each of the following polyatomic ions
a. hydroxide
b. sulfate
c. ammonium
d. phosphate
a . OH–
b. SO4–2
c. NH4+
d. PO4–3
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Secondary seismic waves travel ______________ primary waves in solids
a. in the direction opposite to the movement of b. slower than c. faster than d. at right angles to
Which statement best describes the surface of Europa?
a. dark and dirty ice, heavily pocked with craters b. old and dark on some portion, but cratered with a young bright grooved terrain c. icy crust free of craters with a liquid water ocean beneath d. covered in active sulfur-based volcanoes e. mostly water ice mixed with methane
Radiation: What is the net power radiated by a little animal with a surface area of 0.075 m2 if his emissivity is 0.75, his skin temperature is 315 K, and he is in a room with a temperature of 290 K? (? = 5.67 × 10-8 W/m2 ? K4)
A. 8.8 W B. 6.0 W C. 8.0 W D. 15 W E. 18 W
The rate of expansion of the universe is currently increasing
Indicate whether the statement is true or false