Salt. Carbon, if you have a carbon filter for your fish tank.
Examples of pure substance: gold, silver, carbon dioxide, hydrogen
Foods are not pure substances.
Pure substance can be identified as either elements or compounds. Some examples of pure substance that are elements are sulfur and tin. Pure substances that are compounds are sugar and salt.
Water
bleach , stuff for cleaning washrooms, kitchens etc
Ammonia is a compound and so can exist as a pure substance. Household ammonia is not pure. It is a 3% ammonia solution. The other 97% is water. Pure ammonia is very dangerous.
Salt. Carbon, if you have a carbon filter for your fish tank.
Water is a compound. A pure metal is an element. Graphite (a pencil lead) is the element carbon. These are all examples of a pure substance.
NaCl, or table salt, is a hydrophilic substance. Other examples include practically any household object that absorbs water, such as paper towels, sponges, and cloth.
Mixture, because it is mixed with all sorts of chemicals, such as smog, and or pollen.Mixture is NOT a pure substance, because to be a pure substance, it can't be mixed with anything.
pure substance, propanone
Pure substance