Which equation shows an increase in entropy? (Look at the states of matter of the reactants and products)
А
C2H4(0) + H2(g) → C2H5(9)
B
CaCO3(9) + Ca(s) + CO2(g)
С
Fe(s) + S(s) + Fes(s)
D
2H2(g) + O2(g) + 2H2O(1)
PLEASE HELP ASAP

Wo audio speakers are placed on a vertical rail. speaker a is placed at head-level while speaker b is place at some variable height, \delta yδy, above speaker a. both speakers receive simultaneous input from a sine-wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.531 meters. calculate the lowest height that speaker b can be placed above speaker a to produce a minimum of sound heard by person standing \delta x = 7.86δx=7.86 meters directly in front of speaker a.

The movement of electrons between atoms is called an

Of is j/kg·k. if a 2.6 kg of isk to k,is ?