What is the difference between an atom in the ground state and an atom in an excited state?
a. the atom in the ground state has less energy and is less stable than the atom in an excited state.
b. the atom in an excited state has one fewer electron than the atom in the ground state.
c. the atom in an excited state has more energy and is less stable than the atom in the ground state.
d. the atom in an excited state has one more electron than the atom in the ground state.

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.

What element has similar physical and chemical properties as boron.

How does carbon monoxide pose the greatest threat to humans? a. it can be produced by wood fires. b. it can be produced by home furnaces. c. it is produced by acid rain. d. it is produced by modern automobiles.