Read about activity | 4 Discussions | Page 1

  1. E

    Meaning of Chemical Activity

    Hello - I am wondering abut the meaning of chemical activity. Most definitions are something along the lines of "effective concentration," which is fine until you have a real concentration in a lab, and you don't know if you need to calculate the concentration or "effective" concentration of the...
  2. C

    Why is activity of solvated components equal to 1?

    Homework Statement Consider the following reaction $$\mathrm{Ni^{2+}_{(aq)} + H_2S_{(g)} \to Ni_{(s)} + S_{(s)} + 2H^{+}_{(aq)}}$$ What are the activities of the terms in the reaction? Homework Equations The activity is defined as ##a = c/c^\circ## in ##\mathrm{ mol \, dm^3}## 3. The...
  3. K

    B Static Electricity powered toy car project for school

    I have to make a project for school, so I thought that i can make a static electricity car. I wanted to make a car, and stick/put a material behind the car which creates a charge, and then take another material which creates a charge, and rub it. As it creates static electricity, the cars...
  4. Andrew1949

    B Calculating activity of a radionuclide

    Activity (in Bq) of 1 mol of a radionuclide is given by formula: A = NA x ln(2) / t1/2 = 0.693 x NA / t1/2 where NA is Avogadro number and t1/2 the half-life (in seconds) Why don't we use simply A = 0.5 x NA / t1/2 ? After all, t1/2 means that, after that time, half of atoms will have decayed...