When do you use a pie chart?
o
when you want to show lots of colors
o
when you want to show percentages or parts of a whole
o
when the manipulated variable is a number
o
when there are lots of different variables in the experiement

I believe it is when you want to show percentages or parts of a whole.

Explanation:

Each percentage makes up the "pie," or the whole.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.