Alchemy 101 Define
Like melting and dissolving, can be changed back again. Mixtures can be separated out by methods like filtering and evaporating.
A change is called irreversible if it cannot be changed back again. For example you cannot change a cake back into its ingredients again.
An element, feature, or factor that is liable to vary or change. "There are too many variables involved to make any meaningful predictions"
A supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
Structure of a science investigation
· Reference List
The medieval forerunner of chemistry, concerned with the transmutation of matter, in particular with attempts to convert base metals into gold or find a universal elixir