try standing in front of 30 kids who have no interest in hearing about how sodium bonds with chlorine and getting them on task for an hour.
what you described sounds a breeze in comparison.
I have no idea, but I guess it depends on age. Perhaps getting one of the class to stand up as Sodium and get another to stand close - called chlorine? Perhaps use magnets.
Kids learn well when you interact with them and make things fun.
I didn't do chemistry. Any chance of an explosion or smoke, or does it just make salt?
Sounds like fun and a breeze to be honest
P.S. If you really want to get kids interested in Chemistry, just occaisionall y throw in a recipe such as:
Colored Smoke Bomb Materials
60 g (3 tablespoons) potassium nitrate (sold as saltpeter in garden supply shops)
40 g (2 tablespoons) sugar
1 teaspoon baking soda
60 g (3 tablespoons) powdered organic dye (such as synthetic indigo or an aniline-based dye, found in some craft & hobby shops; not common water-based dye)
cardboard tube (best is an iced push-pop tube (eat the treat first), or you could use a toilet paper roll or section of paper towel tube, or even a rolled/taped paper tube)
duct tape
pen or pencil
firework fuse (hardware, rocketry, construction, or hobby shops, or scavenge it from a firework)
cotton balls
saucepan
Make the Colored Smoke Bomb Mixture
Mix 60 g potassium nitrate with 40 g sugar in a saucepan over low heat. It's a 3:2 ratio, so if you don't have grams, use three large spoonfuls of potassium nitrate and two large spoonfuls of sugar (3 tablespoons and 2 tablespoons, if you feel the need to be precise).
The sugar will carmelize and brown. Stir the mixture continuously until it resembles smooth peanut butter.
Remove the mixture from heat.
Stir in a spoonful of baking soda (rounded teaspoon is fine). The baking soda is added to slow down the combustion when the smoke bomb is ignited.
Add three large spoonfuls (3 tablespoons) of powdered organic dye. Blue dye and orange dye are said to produce better results than the other colors. Stir to mix well.
Construct the smoke bomb while the mixture is still hot and pliable.
Assemble the Smoke Bomb
Fill a cardboard tube with the warm smoke bomb mixture.
Push a pen or pencil down into the center of the mix (doesn't have to be all the way to the bottom but should be enough that the pen stands in the mixture). You could use a different shape, but the cylinder works really well.
Let the mixture harden (about an hour).
Remove the pen.
Insert a firework fuse. Push pieces of cotton balls into the hole to tamp the fuse securely inside the smoke bomb. Be sure there is fuse left outside of the tube so that you will be able to light your smoke bomb.
Wrap the smoke bomb with duct tape. Cover the top and bottom of the tube, too, but leave the hole area with the cotton and fuse uncovered.
Go outside and light your smoke bomb!