Which is the equation of a circle with its center at (-4,2) and a radius of 4?
Select one:
a. (x+4)2 + (y-2)2 = 16
b. (x-4)2 + (y+2)2 = 16
c. (x-4)2 + (y+2)2 = 4
d. (x+4)2 + (y-2)2 = 4

Which of these is a physical property

Amixture initially contains a, b, and c in the following concentrations: [a] = 0.300 m , [b] = 1.05 m , and [c] = 0.550 m . the following reaction occurs and equilibrium is established: a+2b⇌c at equilibrium, [a] = 0.140 m and [c] = 0.710 m . calculate the value of the equilibrium constant, kc.

Consider the reaction: 2al(s) + fe2o3(s) → al2o3(s) + 2fe(s) the δhf for fe2o3(s) = -824.3 kj/mole. the δhf for al2o3(s) = -1675.7 kj/mole. finish the equation. δhrxn = [(1)( kj/mole) + (2)( kj/mole)] - [(1)( kj/mole) + (2) ( kj/mole)]