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问题2 25 Chemistry is the study of matter and its transformations. Let’s consider a scenario in which a pure solid decomposes on heating, yielding a solid and a gas, each of which is a pure substance. From this we can conclude with certainty that the original solid is not an element. at least one of the products is an element. both products are compounds. both products are elements. 2 Which representation shows the correct curve for the potential energy of an electron vs. distance from a proton? Potential energy O Distance between particles Potential energy Distance between particles O Potential energy Distance between particles Potential energy Distance between particles 问题4 25 Carbon-14 and Nitrogen-14 both have the same mass number, yet they are different elements. Which of the following statements is true?

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