Will Na2Co3 turn red litmus paper to blue?

Which is the most likely way an automotive engineer would use chemistry

Which of these conditions most likely produces an unstable isotope?

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.