1a. The Nitrate is known as a "spectator ion" because it has no involvement in the reaction. It is just bonded to the other ions, and sits idle in the reaction.
1b. Magnesium is oxidized, and Silver is reduced.
2. If X is more reactive than Y (higher up on table J) then the X and Y+2 will spontaneously react.
3-1. The activity series is the list of elements is order or activity.
3-2. An activity series can be used to predict which metal is more reactive by determining which elements spontaneously react with each other.
4. Gold and Silver were discovered earlier than the other four by humans because they can be easily found in nature. They do not easily react with the air to form oxides, unlike the other metals which are difficult to find alone in nature.
5-1. Copper was smelted by placing the ore is fire, and applying oxygen to the process through blowtubes.
5-2. Bronze was made by mixing copper and tin ore together and smelting it.
Enrichment: Silver was important in Kodak because Silver Halide paper was used as film to print the photos. This was important because the Silver Halides are light sensitive, and images can appear and can be developed on the film, depending on the amount of light used ( thus, the creation of the "dark room").
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