During chemical reactions atoms remain unchanged.
Transmutation of elements refers to the conversion of one chemical element into another. This occurs in nuclear reactions or through radioactive decay.
A physical change doesn't involve chemical reactions, change of the molecule structure.The chemical reactivity is about the ability of an element or compound to realize chemical reactions.
"Substance" is too fuzzy a word. Chemical reactions can change materials into other compounds, for example shiny iron into rust (Fe2O3). But it cannot change an element into another element. A nuclear reaction can do that, for example uranium into plutonium.
A chemical change can be caused by a reaction. It an element or compound reacts with another, it is known as a chemical change.
No and element cannot be broken down or changed into another substance through a chemical change. The number of protons in the nucleus of an atom determines the identity of the substance. But, a chemical change involves only the atoms electrons. -SmartyPants94
Reactions that are not chemical reactions are physical reactions. These reactions involve a change in only the physical state of an element, not its chemical properties. Thus, physical changes include freezing, condensation, sublimation, hammering a metal into a sheet, cutting sodium metal, etc.
Chemical reactions are chemical processes.
Gold is an element. It is impossible to change one element into another by chemical means. It is possible to do so via nuclear reactions, but alchemists did not know about such things.
No. Living things can only take part in chemical reactions using various forms of energy, and these only change the way chemical elements are bonded together, not the elements themselves.
a) formation of chemical compounds b) formation of alloys
If you mean changing one element into another, like uranium 238 into plutonium 239, which happens in nuclear reactors, the word is 'transmutation'. Otherwise many chemical reactions form new substances, without the elements involved changing, and these would be called 'chemical reactions'.
All of the elements of the Periodic Table cannot be broken down into simpler substances.