What is the study of the composition of matter and the changes that matter undergoes? a. alchemy b. chemistry c. metallurgy d. pharmacology

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

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.