Which of the following happens during a lunar eclipse?

select one:
a. earth casts a shadow on the moon.
b. the moon casts a shadow on earth.
c. earth stops revolving in its orbit.
d. earth starts revolving around the moon.

Which other elements contain the same number of outer electrons as sodium

One does not belong why? ice, gold ,wood ,diamond and table salt

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.