add alcohol
A salad would be an example of a heterogeneous mixture. This is because how the contents of a salad are mixed up together but they are not the same. You could piece by piece pick a salad apart into its separate pieces again.
Settle it and pour off the water, or simply filter the sand out of the water.
by sight
the separation of alchol from a mixture of alchol is distilation. have fun and enjoy science.
Presuming the staples are made from a magnetic metal (either Copper, Iron or Cobalt), you could use a magnet to remove the staples from the sand and salt mixture.You can then add water to the remaining mixture, which will allow the salt to dissolve. You can then filter the solution to separate the sand from the salt solution.You can then simply evaporate the water from the salt solution using heat, and you will be left with the salt!
Wash the mixture with water and separate the solid from the liquid, for example, by filtration. The sodium chloride will dissolve in the wash water, while the copper is left behind.
copper pieces only
You can separate them by their colors, copper having a pinkish tint and aluminum a gray tint. You could use your fingers or a pair of forceps to pick the pieces apart. If they are of different sizes, you could use a screened sieve to sort them.
The easiest way is with a magnet. It'll attract the iron and not the copper. If you're on a higher budget, the difference in the melting point could help.
You could sift the mixture through a wire screen sieve which has a mesh small enough to let the sand pass through, leaving the copper on top of the screen.
you can answer that by your mind. you can separate it by using a wire WIREGAUSE.
We could add HCl to the mixture of Zinc and Gold and see which one appear to separate first.
sure, why not.
toilet paper
Given its an ionic compound, you could probably just disassociate it with water. Or you could react it with a more electrophilic metal than Copper is.
There is no substance called "copper sulphur". You could have a mixture of copper and sulphur, though. But there are compounds (pure substances) of copper and sulphur as well. They include copper I and copper II sulphide (Cu2S and CuS). Another, very common compound is copper sulphate, CuSO4
use a magnet