Moderators plz delete my questions, its important

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

What is the solubility of substance?

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.