Yes; it is tinned copper.
Whichever one you connect to the positive terminal. The colors are there so you can find the same wire at the other end.
It doesn't really matter, as long as you connect them to the same polarity at both ends. Most people use the gold or reddish-copper wire as the positive, as it is the red terminal and the silver, or non-colored lead to the negative as it is black.
In speaker connectors, the copper-colored connector is usually positive, and the silver-colored connector is negative.
No. Ni-Chrome wire is resistance wire used in pottery and as a heating element for pyrotechnics. There is no application for Home Theater for this wire.
It is better to use 16 gauge or 14 gauge speaker wire for your home theater applications.
It is traditional to use the copper colored wire as the positive. Of course, the electrons don't care what color the wire is as long as you hook it up the same at both ends!
Speaker cable can have an insulator that could be any color. The wire inside is typically silver, copper or gold colored.
Whichever one you connect to the positive terminal. The colors are there so you can find the same wire at the other end.
When you place copper wire in a silver nitrate solution, your result should be a heterogeneous mixture.
The price of copper today is $3.43 a pound. The price of silver today is $12.90 an ounce. Copper is much cheaper.
The copper and silver will combust.
My PC speaker cables have a copper wire, as well as a insulated (white) copper wire. The headphones (Sony) appear to have 3 wires in them - green, red, and orange. The links you posted are more for car/home theater speaker wire.
The best conductor of electricity is copper wire. Silver is a better conductor than copper, look up basic data. But silver is not practicable for widespread use, copper is nearly as good and more practicable for engineering use as well as cost.
It doesn't really matter, as long as you connect them to the same polarity at both ends. Most people use the gold or reddish-copper wire as the positive, as it is the red terminal and the silver, or non-colored lead to the negative as it is black.
Black wire to copper screw, white wire to silver screw, bare copper ground wire to green ground screw.
Usually copper, sometimes gold or silver.
In speaker connectors, the copper-colored connector is usually positive, and the silver-colored connector is negative.