What angle does each of the following represent in a pie chart : Ca 20 % , and Carbon 12%? (PLEASE ANSWER I WILL MARK AS BRILLIANT FOR TRUE RIGHT ANSWERS!!! and please explain and show your work too please)

Which statement describes evidence of a chemical reaction? a) ice melting eliminate b) water boiling c) lighting a match d) grape juice freezing

100 points answer quick 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.

Can someone me with questions 15 to 17 plz.