Question

defination of physical and chemical changes

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Answer 1

Answer:

Physical changes only change the appearance of a substance, not its chemical composition.

Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions....

Answer 2

The creation of the printing press (using movable type) by Johannes Gutenberg in the 1450s encouraged authors to write in their local vernacular rather than in Greek or Latin classical languages, widening the reading audience and promoting the spread of Renaissance ideas.