![]() ![]() We’ve used cupboard handles or balanced a cooling rack across two chairs. Then, hang a cooling rack or colander.There will be excess water left over in the bowl. Mix well, and then mix in the water-Borax mixture.In a separate container, combine glue, 1/4 cup of water and food colouring.Measure one cup of hot water and mix in Borax until fully dissolved.1/4 cup tap water (temperature doesn’t matter).Note: if using Borax, this activity should not be done with children who might taste the slime. Introduction to Chemistry Physical and Chemical Changes to Matter Learning Objective Identify the key features of physical and chemical changes Key Points Physical changes only change the appearance of a substance, not its chemical composition. This makes the glue flow less easily becoming more of a solid. A chemical cold pack in a first aid kit is an example of a chemical reaction that absorbs heat energy resulting in cooling. This chemical reaction works because the borax forms borate ions that bind to the liquid-like polymers in the glue. Burning wood is an example of a reaction that releases excess energy as heat. They are now old enough to execute the entire chemical reaction on their own. Years later, this is still one of their favourite activities of all time. The first time we did this activity, my kids were under the age of three. Using a large container or an empty driveway, open the bottle of Diet Coke and have your children drop the Mentos into the bottle.To understand why the mentor and Diet Coke react together the way they do, and to see the experiment in action, check out the awesome Steve Spangler video below: ![]() A kiddie pool or large basin is handy if you want to contain the results. I highly recommend doing this outside so you wash away the sticky results with a hose.
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