Which method is used to make fake gold coins? Additive Plating:  A plating reaction where metal cations are reduced by an electron donor in solution. The reduced cations coat the surface of an object. OR Displacement Plating A plating reaction is where metal cations are reduced by metals on the surface of an object. The reduced metal cations become neutral atoms and coat the object, replacing the oxidized metal atoms that become metal cations.

Identify whether or not each of the following reactions is a redox reaction.  To determine whether or not a reaction is a redox reaction, figure out the oxidation number of each atom.  If the oxidation numbers do not change from one side to another, then it is not a redox reaction.  Write the oxidation number of each atom above it on both the reactant and product side.  Write the oxidation number for only one atom.  For example, the oxidation number of each Br in Br2 is zero, so write a zero above Br2.     H2O     +     H2O    →     H3O+    +     OH-       Cu     +      S    →      CuS       2 NOBr      →      N2      +     O2    +    Br2       CH3CH2CH3      +     5 O2     →     3 CO2     +     4 H2O       Ca(NO3)2     +     Na2SO4     →     2 NaNO3      +     CaSO4   Provide a definition for each of the four types of redox reactions.  Indicate the type of redox reaction each redox reaction is in the section above.    Single Displacement Combustion Synthesis Decomposition

Ultra-pure Si is required to produce semi-conductors. The first step in this process is combining silicon dioxide with carbon and chlorine. Choose the answer that represents the sum of all the coefficients when this equation is balanced using the smallest whole number coefficients. SiO2 + C + Cl2→ CO + SICI4 O a. 6 b. 7 О с. 16 d. 8 О е.5 ОООО С

Animation-Analysis of Copper-Zinc Voltaic Cell Zinc Some oxidation-reduction reactions are spontaneous, and the energy released by them can be used for electrical work. This principle is used in the working of a voltaic cell. Voltaic cells, or electrochemical cells, make use of the electrons that are transferred from the species that releases electrons and undergoes oxidation to the species that accepts electrons and undergoes reduction. If it is possible by any means to separate the oxidation reaction and the reduction reaction and then connect them externally so that the electrons flow from one compartment to the other, you can construct an electrochemical cell. Watch the video that describes the cell reaction and the cell components of a voltaic cell. 1.10 14 of 42 Na₂SO₂(aq) Review | Constants | Periodic Table Z 5042 Cu2+ $0,² In a copper-zinc voltaic cell, one half-cell consists of a Zn electrode inserted in a solution of zinc sulfate and the other half-cell consists of a Cu…