How much of the original amount of an isotope is present after a period of two half-lives? A. Four times the original amount
B. One-fourth of the original amount
C. Twice the original amount
D. Half of the original amount

H2so4(aq) + mg(s)—> mgso4(aq) +h2(g) which substance is the acid in the reaction?

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.

What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?