The following are artificial nuclear reactions that occur by bombardment. Balance each equation, identifying the missing particles' mass number, atomic number, and element symbol:

238/92 U + 14/7 N ---> _ + 5 1/0 n

252/98 Cf + _ ---> 257/103 Lr + 5 1/0 n

57/24 Cr + 4/2 He ---> _ + 56/26 Fe

40/18 Ar + 4/2 He ---> _ + 1/1 H

What is the empirical formula for c4h8o2

Draw any one of the skeletal structures of a 2° alkyl bromide having the molecular formula of c6h13br and two stereogenic centers. indicate chirality by using wedge and hashed wedge notation. lone pairs do not need to be shown.

Answer asap need 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.