Odor; Physical
Odor is a human sense (or an animal sense), if you lack the organs for detecting it, then a substance is "odorless" ... to you. Note that (for us mammals) a substance must be in vapor form to be detected, thus solids lack odor in general, while heating intensifies odor.
Floating is a physical property, and is not a 'change' in any sense.
Atoms of elements combine to form compounds. A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances.
Phosphorus is one of the chemical elements and therefore has no "chemical composition" in the usual sense.
It's a pure substance because even though the atoms are different they still the same. If that makes sense?
Odor; Physical
Both the sense of taste and the sense of smell detect the chemical composition of a substance through chemoreceptors.Taste is detected by the tongue in solids and in liquids, while smell is detected by the nose in airborn substances.
Both the sense of taste and the sense of smell detect the chemical composition of a substance through chemoreceptors.Taste is detected by the tongue in solids and in liquids, while smell is detected by the nose in airborn substances.
smell/nose
Your SENSE of smell is physical, but smells are created by chemical interactions.
Any chemical compound, natural or artificial is a chemical substance. In the colloquial discussion the term substance is used in a more large sense, applied frequently to many materials.
Floating is a physical property, and is not a 'change' in any sense.
Odor is a human sense (or an animal sense), if you lack the organs for detecting it, then a substance is "odorless" ... to you. Note that (for us mammals) a substance must be in vapor form to be detected, thus solids lack odor in general, while heating intensifies odor.
Um, the addition of acid to anything is a chemical reaction! One Acid is applied to Zinc it becomes something else. So a chemical property, I guess, this question really makes no sense.
Yes it is, in the sense that virtually anything can be classed as a chemical substance if regarded that way. Coconut charcoal is very porous indeed - more so than charcoal obtained from other sources.
Floating is a physical property, and is not a 'change' in any sense.
Chemistry can be a tough subject but I will try my best to answer your question thoroughly. A substance can have chemical and physical properties. Physical properties do not change the substance chemically whereas chemical properties change the chemical nature. A good example is H2O (water) it's boiling point is 100°C (212 °F) and freezing point 0°C (32 °F). When water is boiling it is still H2O and the same when frozen. It only changes its physical state (Gas/Liquid/Solid). Hope this makes sense and helps.