which description of an atom is accurate? a: nucleus surrounded by protons and neutrons. B: nucleus containing electrons and protons. C: electrons encircling a nucleus with neutrons and protons. D: protons surrounded by neutrons and electrons

The answer is C

Explanation:

a nucleus contains protons and neutrons and electrons orbit the nucleus

passing a magnet thought the

mixture , because iron gets attracted to magnet .

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e