Which of the following statements is (are) false? i. the layering in a hexagonal closest-packed structure is aba. ii. a body-centered cubic unit cell has four atoms per unit cell. iii. for unit cells having a simple cubic (primitive) structure, there would be one atom (net) for each unit cell. iv. atoms in a solid consisting of only one element would have six nearest neighbors if the crystal structure were a simple cubic array.

Predict the products butane (c4h10) + oxygen —>

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.

State one important difference between a physical change and a chemical change?