Zinc, Zn, is more easily oxidized than copper, Cu. Two strips of these metals are placed within separate salt solutions and then connected by a wire. Does an electric current pass through this wire?
A) Yes, as the zinc is oxidized in the salt solution, its released electrons pass through the wire producing an electric current.
B) No, an electric current does not pass through the wire because this would result in a prohibitive build up of charge.
C) Yes and No. The passage of an electric current depends on whether the salt solutions are sufficiently concentrated to cause the oxidation of the zinc metal. The answer is yes only if the salt solution concentration is greater than 1M.
D) There is insufficient information given to know. The passage of electric current depends on three things: the size of the plates, the concentration of the salt solution, and the gauge of the wire.
Question 2
Which of the following best describes an exothermic nuclear fission reaction?
A) The number of nucleons changes before and after the reaction.
B) The mass of the products is less than the mass of the reactants.
C) The energy released decreases with a greater loss of mass.
D) All of the above describe a fusion reaction.
E) None of the above describe a fusion reaction.
Desert cottontail as seen from behind such that the white tail is easily visible
copper
copper
copper
Oil molecules cling to metal surfaces but easily slide against each other.
Zinc-finger nucleases and TALENs bind and cut DNA at specific sequences