Which of the following is a synthesis reaction? BaO+CO2=BaCO3
CH4+O2=CO2+H2O
FeCO3=FeO+CO2
2NH3=2N2+3H2

What substance has a mass of 9.5g and volume of 2.1cm^3

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.

The fact that the total amount of energy in a system remains constant is a(n)