Đồng có hai đồng vị 65 Cu 29
Và 63Cu. Nguyên tử khối tb
29
Của đồng là 63,54.Tính thành phần phần trăm số nguyên tử của mỗi đồng vii

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

11 players on a field that has a maximum of 11 players

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