19. which of the following statements is accurate? a. if an object is said to be decelerating, its velocity must be increasing. b. if an object's velocity decreases, then the object is accelerating. c. if an object's velocity remains constant, its acceleration must be increasing. d. if an object's velocity is changing, it's either experiencing acceleration or deceleration

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al oxidizing agent = reducing agent =

Answer asap need to be answered 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.