Which of the following stays constant when diluting a solution? Select the correct answer below:

A) volume
B) molarity
C) concentration
D) amount of solute

when you're diluting a solution, you're adding in more solvent, so the solute will maintain the same (D)

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.