1. another name of "electrolytic cell " is "elecrochemical cell"??? are these two exactly the same? 2. In the molecule, H3C6H5O7, it gives three protons in the solution. How can we know this molecule gives three proton without drawing molecular structure? 3. "A 3d orbital can hold a maximum of 10 electorns." Is this statement true? I think it's ture, but answer is false. 4. A+B ---> C Which of the following would not affect the reaction rate of this irreversible reaction? a. decreasing A b. increasing B c. adding a catalyst d. removing C e. increasing temperature 5. If Cs metal was exposed to light of a certain minimum frequency called the threshold frequency, electrons are ejected from the surface of the metal. What is the correct term for this phenomenon? a. quantum theory b. photoelectirc effect c. bohr effect d. poto fluorescent effect e. tunneling effect => answer is b, but how about a? why not a?