Selina claims that combining copper sulfate and zinc created a chemical reaction. Construct an explanation that addresses the following parts: Part A: Identify the evidence of chemical or physical changes in the experiment.
Part B: Explain why Selina is correct or incorrect using evidence from the experiment.
Part C: Describe what happened to the copper and zinc atoms during the experiment. Explain your answer.

c, liquids evaporate, creating a gas

your answer is c) plasma

~*"auba14"*~

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.