Suppose that a different student obtained reaction rates for the particle-size experiment, and that
these rates did not show a pattern. Check all
possible sources of this error.
O Some of the broken tablet was not added to
the water
The tablet was not crushed enough to make
a substantial difference.
The size of the reaction beaker was varied.
The tablets were not uniform in their mass.

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

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.

answer: gold foil experiment - he shot alpha particles at a gold foil

explanation: