Li ming thinks that chlorophyll is a reactant of photosynthesis, but her classmate julian disagrees. who is correct, and why?

li ming is correct because chlorophyll is a substance that is present before the chemical reaction of photosynthesis takes place.
li ming is correct because chlorophyll is a substance that is formed from the chemical reaction of photosynthesis.
julian is correct because chlorophyll is a product, not a reactant, of photosynthesis.
julian is correct because chlorophyll is neither used up nor formed in the chemical reaction of photosynthesis.

What are transitions between a liquid and a solid called? identify which way they are transitioning

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

What relationship exists between an enzyme and a catalyst?