9. Why are active metals more difficult to process and refine than are less active metals?
Because active metals react with most things, making it difficult to process, unlike less active metals because they don't react with many things
10. Based on your results from Investingation Matter which metals involved in that investigation would be the easiest to process? why?
Copper because it was the least active.
11.Why do most metals exist in nature as minerals rather than a pure metallic elements?
Because of their reactivity with many other elements
12. Which of these retains is more likcy to occur? why?
a. Calcium metal with chromium (III) chloride
b. Chromium metal with calcium chloride
a. Calcium metal with chromium (III) chloride
Because Calcium is more reactive than chromium
13. Consider the following two equations. Which equation represents a reaction that is more likely to occur? Why?
b. Because silver is more reactive than zinc
(2 Ag+(aq) + Zn(s)-> 2ag(s) + zn2+(aq)
14. a. Why would it be a poor idea to stir a solution of lead (II) nitrate with an iron spoon?
Because lead is less active than iron
b.White a chemical equation to support your answer.
Pb(NO3)2++Fe---> Fe + Pb(NO)
15. Define oxidation and reduction in terms of electron transfer.
Reduction is when you gain one or more electrons
Oxidation is when you loose one or more electrons
16.Write an equation for each of the following processes:
a. Reduction of gold (III) ion to gold metal
Au3+ ---> 3e- + Au
b. the oxidation of elemental vanadium to vanadium (IV) ions
V ----> V4++4e-
C. The oxidation of Cu+ to Cu2+
Cu--> 2e+ Cu
17. Identify each of the following equations as representing either an oxidation reaction or a reduction reaction.
a. reduction
b. Oxidized
C.reduction
18. Consider the following equation:
a. Which reaction has been oxidized? Explain
The zinc because it lost 2 electrons
b. Which reactant has been reduced? explain
Nickle because it gained 2 electrons
c. What is the reducing age in this reaction
Zinc
19
a. Which reactant has been oxidized? Explain?
Potassium, it lost an electron
b.Which reactant has been reduced Explain?
Murcry it gained two electrons
c. Potassium
20. Al + Cr3 ---> Al3+ + Cr
Mn2+ + Mg--> Mn + Mg2+
21.a. Electrometallurgy: Pass direct electric current through the molten mineral salt
b. Prymetallurgy: Heat mineral with coke or carbon monozide
c. Hydrometallurgy: Heat mineral in air or find the metal free
22. What processes would be most useful in obtaining the following elements from their ores?
a. Magnesium: Electrometallurgy
b. Lead: pyrometallurgy
No comments:
Post a Comment