Homework Blog 14

26. Metallic elements are more likely to lose electrons than nonmetallic elements because they form cations.

27. Since nobel gasses never loose or gain electrons, they are un-reactive and chemically inert.

28.
a.cation
b.cation
c.anion
d.cation
e.anion
f.cation
g.cation
h.anion

29. Copper metal and copper (II) ions are more chemically similar chemically than oxygen with a mass # 16 and oxygen with a mass # 18. The difference between copper metal and ions is only the amount of electrons that are lost. However, the newly formed oxygen is a vital example of an isotope, a larger difference.

30. The diameter of a calcium ion would be 205 pm because 154 + 256 / 2 = 205.

31.
a. Change in color
- Chemical: rusting
-Physical: painting
b. Change in temperature
-Chemical: burning
-Physical: boiling
c. Formation of gas
-Chemical: reaction of two elements
-Physical: evaporation

32.
a. Bromine
b. Silicon

33. Mendeleev used atomic weight. In the fish kill, we analyzed the mass changes of substances compared to the normal masses in attempt to solve the mystery.

34. Argon would have needed to go after potassium and cobalt would have to go after nickel.


1.
-Atmosphere: nitrogen and oxygen
-Hydrosphere: water and dissolved minerals
-Lithosphere: petroleum and metal-breaking ores

2.
a. The three major parts of the lithosphere are the crust, the mantle and the core. The crust is the hard solid rock that contains a large portion of earths minerals. The mantle is the middle of the lithosphere and the core is the inside of the earth that is very hot.
b The crust.

3.
a. Silver: Mexico
b. Copper: Japan
c. Tin: China

4. China produces the largest masses of the eight listed resources in the table.

5. Minerals differ from ores because while minerals are naturally occurring solid compounds containing the element or group of elements of interest, ores are the environmental impact of the mining and metal processing.

6. Many factors can determine the possibility of mining a particular metallic ore at a certain cite including the percent of metal in the ore, the type of mining and processing used to extract the metal from the ore, and the environmental impact of the mining and metal processing.

7. A 19th century gold mine that was inactive for 100 years and recently re-openeed for further mining possibly because more cold was created also creating a high demand.

8. "Useful ore" means the quantity, typically represented in percent, of the mined mineral.