Magic Milk

Magic Milk

IMG_6084I did this video for my granddaughter Sophie who lives too far away to see as much as I would like. The chemistry behind the moving colour is fascinating but I’ll leave that for now.

Sodium and chlorine reacting to form an ionic compound sodium chloride

What happens when sodium and chlorine atoms react?

Sodium has one electron in its outer shell. Chlorine has seven electrons in its outer shell. When they react sodium loses an electron to become a sodium ion with a charge of +1. Chlorine atoms accept an electron to become chloride ions with a charge of -1. After reacting the sodium and chloride ions have a full outer shell of electrons. A full outer shell of electrons is a stable arrangement. The inert gasses in group 18 of the periodic table all have a full outer shell and characteristically are very unreactive (they don’t easily combine with other elements). The new substance sodium chloride is made up of ions. Compounds that have ions bonded together are called ionic. The ions are held together by powerful electrostatic forces. Ionic compounds typically have high melting and boiling points as a consequence.

Homework… how much of this do you understand?

Watch the video especially the bit that deals with the changes to sodium and chlorine atoms when they react with each other. Magnesium has two electrons in its outer shell and it burns in chlorine gas like sodium.
Draw sodium and chlorine atoms and show how ions are produced when they react.
What are the charges of the ions?
what is the formula of magnesium chloride?

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