- What is the difference between sublimation,condensation, and evaporation?

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What is the density range of thermosets? SO2 -> ? K2Cr2O7? F(x)= (x^3/2)-sinx+1 Find the tangent line approximation of f at pi/2? The function f is f(x)= (x+4)(x-a), the graph of f is a parabola , a is const. The x coord. is b/w 1 and 3, which is a?
A. -2
B. 1
C. 5
D. 9? How many molecules of c2h6 are present in 2.8 dm3 of c2h6 at STP?