Which of the following is an example of a heterogeneous equilibrium reaction? O a) MgO(s) + CO2(g) = MgCO3(s) O b) C2H2(g) + 2Br2(g) = C2H2Br4(8) O c) N2(g) + 3H2(g) = 2NH3(8) O d) N204(8) =2NO2(8) O e) H2(g) + F2(8)=2HF(3)

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

If two atoms are bonded to a central atom with no lone pairs,how will they be arranged

Avariable that is not being directly tested during an experiment should be