Nitrogen and hydrogen react to form ammonia. consider the mixture
of n2 (blue spheres) and h2 (gray spheres) in the illustration.
all but one statement regarding the reaction is true

a)nitrogen is in excess.
b)hydrogen is in excess.
c)this is a synthesis reaction.
d)hydrogen is the limiting reactant.

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.

Identify some abiotic characteristics of the tundra biome.

Which property is expressed in distance units? o a. period o b. wavelength o c. speed o d. frequency