normarismendoza
30.01.2020 •
Chemistry
Two or more different atoms are combined in definite proportions in any.
a. symbol c. proton
b. isotope d. compound
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Ответ:
Compounds are pure substances, which consists of two or more elements chemically combined in a fixed proportion by mass. Compounds have definite proportion.
Ответ:
paper burned and turned into smoke
Explanation:
it is irreversible and all the others are represent physical changes