8. What must occur for a change to be a chemical reaction? a. There must be a change in chemical properties.
b. There must be a change in physical properties.
The change must involve a change in volume.
d. The change must involve a change in mass.
C.
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Which of the following statements is true? question 4 options: nuclear decay rates vary with the conditions of the reaction, but chemical reaction rates do not. chemical reaction rates vary with the conditions of the reaction, but nuclear decay rates do not. neither chemical reaction rates nor nuclear decay rates vary with the conditions of the reaction. both chemical reaction rates and nuclear decay rates vary with the conditions of the reaction.

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

What is the lowest number energy level where a d sublevel is found