If an element has a half life of one million years, how long will it take to be completely gone

Esign techniques and materials that reduce the negative environmental impact of a structure are referred to as

When the mercury level in a barometer decreases that atmospheric pressure has

Kp is the equilibrium constant for dissociation of the propionic acid dimer. what is the sign of the slope for a plot of the natural logarithm of kp vs. inverse temperature for this reaction?