A solution of 0.31 M Pb(NO3)2 and 0.27 M AgNO3 is formed. What will precipitate first if solid KCl is added? (Ksp of PbCl2 = 1.6 x 10-5 and Ksp of AgCl = 1.8 x 10-10) A) KNO3
B) AgCl
C) PbCl2
D) AgNO3

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.

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]