L-histamine is an essential amino acid.

a. True
b. False

Consider the reaction: 2al(s) + fe2o3(s) → al2o3(s) + 2fe(s) the δhf for fe2o3(s) = -824.3 kj/mole. the δhf for al2o3(s) = -1675.7 kj/mole. finish the equation. δhrxn = [(1)( kj/mole) + (2)( kj/mole)] - [(1)( kj/mole) + (2) ( kj/mole)]

What conclusion can you draw from this experiment about the components of the black ink?

Anitrogen atom and an oxygen atom combine chemically to form nitric oxide. what is nitric oxide?