Using the following values of pKb, select the strongest acid from those listed in the answers. a. C5H5N (pKb = 8.75) b. N2H4 (pKb = 5.77) c. C6H5NH2 (pKb = 9.37) d. NH3 (pKb = 4.75) e. C2H5NH2 (pKb = 3.19)

A sample of iron has a mass of 46.8 grams and a volume of 6 cm3. what is the density of iron?

Is the following item durable or nondurable? hamburger

How are fossils formed A an organism is covered in sand or soil B the climate because too warm for an organism C an organisms characteristics change D sediment gardens around an organism

Consider the following reaction:CaCO3 (s) →CaO (s) + CO2 (g). Estimate ΔG∘ for this reaction at each of the following temperatures. (Assume that ΔH∘ and ΔS∘ do not change too much within the given temperature range.) A. 285 KΔG∘ = B. 1025 KΔG∘=C.

What is the energy of an electromagnetic wave with a frequency of 3 x 109 Hz? A. 5.96 x 10-17 B. 6.63 x 10-35 u c. 9.00 x 1017 D. 1.99 x 10-24

When bases dissolve in water they release what type of negative ion?

An acid is added to water, and a new equilibrium is established. What is the system after the acid is added?

The hydrogen spectrum has a red line at 656 nm, and a blue line at 434 nm. What is the first order angular separation between the two spectral lines obtained with a diffraction grating with 5000 rulings/cm? A. 7.7 degrees B. 16.6 degrees C. 6.

g write net ionic equations for the reactions of h2po4 - an amphiprotic ion with aqueous solutions of hcl koh

Eagles use sharp talons to grab fish from the water. What characteristic of life is this most directly an example of?