Which describes redshifts? check all that apply.
the light source and observer move closer together.
observed light shifts to a longer wavelength.
they indicate receding galaxies.
observed light shifts to a shorter wavelength.
the light source and observer move farther apart.
they indicate approaching galaxies.

The number at the end of an isotope’s name is the number.

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

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.