There are 3 main substances that can be recycled. These 3 substances are paper products, metal products, and glass products.
metal! (To all you nova net people)
bottles, cans, paper
Yes, they are widely recycled, and the process uses less energy then producing new aluminum from ore.
electricity was more widely avaliable.
The GRAS list
Limestone is widely used to prepare cement, calcium hydroxide or as building material.
eg:-Chromatography is a widely used technique in chemistry to isolate different substances in pure form.
Polyurethane foam does exist and is mostly widely used in Building and construction, Transportation and Appliances. More information about urethane foam can be found at wikipedia which has an whole article on it.
Kitchen's Direct a club style store where you can purchase many varieties of kitchen appliances and cabinets. Prices range widely depending on what your looking for.
A kilogram is a unit of mass, not of volume. The volume varies widely, for different substances. Look up the density for a particular substance, to do the conversion.
producing aluminum requires a lot of energy to produce and potentially CO2. recycling it uses a lot less.
The majority of plastic cups can be reused or recycled. Polystyrene, or foam, cups are not widely recyclable. Cost wise, plastic cups tend to more inexpensive than polystyrene cups.
Aluminum is most naturally found - in huge quantities - in an ore called "bauxite", which is very common in the earth's crust. There is not - and is not projected to be - any shortage of aluminum in the forseeable future. Assisting this is the fact that aluminum is widely recycled.