When a solution of AgNO3 is mixed with a solution of NaBr:

1) NaNO3 precipitate will spontaneously form.

2) After a few minutes pass, the concentration of Ag+ and Br- will be lower than when the two solutions were first mixed.

3) After a few minutes pass, the concentration of Ag+ and Br- will be the same as when the two solutions were first mixed

4) The concentration of Ag+ and Br- are momentarily greater than in a saturated solution of AgBr.

5) AgBr precipitate will spontaneously form.

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally