The precipitate formed in the reaction above is evidence of a chemical change because? A. A change in the temperature has taken place.

B. A change in the state of matter has occurred

C. A color change has taken place

D. A new substance has been formed

Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

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.