There are only 90 naturally occurring elements on Earth, but there are millions of different substances. Explain how this is
possible and describe how it applies to at least three examples.

Calculate the molarity of 48.0 ml of 6.00 m h2so4 diluted to 0.250 l .

The arrangement of particles is most ordered in a sample of

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.