Chem Radioisotopes (1 Viewer)

[norez]

Does anyone know the decay reaction for iodine-123? I've looked online, in my textbook and in the resources. Even if it's just a word equation

Any help would be appreciated.

 

[khorne]

Why do you need the decay series? It will never ask it. It might ask how it's produced, but not it's decay. But suffice to say, it will decay with a combination of gamma and beta decay

 

[b3kh1t]

Does anyone know the decay reaction for iodine-123? I've looked online, in my textbook and in the resources. Even if it's just a word equation

Any help would be appreciated.

It decays into Tellerium-123 producing beta and gamma radiation.

 

[lpodnano]

Btw I'm going to steal this thread. How do you do the MC question 20 in 2010? I know it's pathetic to struggle at MC, but I can't do it!

 

[khorne]

Btw I'm going to steal this thread. How do you do the MC question 20 in 2010? I know it's pathetic to struggle at MC, but I can't do it!

Line for atomic absorbance is y = mx

concentration 0, abs = 0
concentration 10, abs = 0.4
so gradient is 0.4/10, abs = 0.4/10 * conc.

therefore conc at 0.5 = 12.5 ppm, etc

 

[jamesfirst]

Btw I'm going to steal this thread. How do you do the MC question 20 in 2010? I know it's pathetic to struggle at MC, but I can't do it!

why is it pathetic...


Sometimes the MC is fked up

 

[b3kh1t]

Btw I'm going to steal this thread. How do you do the MC question 20 in 2010? I know it's pathetic to struggle at MC, but I can't do it!

Lol it's quite simple to start a new thread but anyway.

As the curve will be linear or close to it, we can say
which equals 12.5 mg/L

therefore Cu2+ in 100 mL is 1/10x12.5=1.25 mg
number of moles of Cu2+= 0.00125/65.55 = 1.97x10^-5 moles



therefore number of moles of Cu2+ = number of moles of CuCO3
number of moles of CuCO3 = 1.97x10^-5
therefore mass of CuCO3 = 1.97x10^-5 x 123.55 = 2.43x10^-3g

therefore answer is (B), oh and don't worry multiply choice is hard so it's not pathetic