Pull the blob out of the bag, leaving any liquid behind.Īllow students time to play with their slime. Mould with hands through the bag to mix completely. Lift the blob out of the cup, and into a small baggie. Pour the borax mixture into the white glue mixture. To 4 tspns glue in a cup, add 1 Tbspn water. To an empty cup, add 1 Tbspn water and 1⁄16 tspn borax. ![]() Give students their materials: 4tspns of glue in a cup, an empty cup, a squeeze bottle of water and a tablespoon measure, borax powder in a cup and a 1/16tspn or equivalent measure (I use two scoops of a very small measure). To make two different slime/silly putty recipes, with different consistenciesĪsk students to work on the tray, as this activity is messy.įirst make the classic slime recipe as follows: However, when slime is pulled on suddenly, many hydrogen bonds are broken at once, so it breaks apart. As these hydrogen bonds continually break and reform, the slime stays in one piece but can flow and change shape. When the slime is pulled slowly, a few of the hydrogen molecules break, but then reform with another adjacent polymer. There are other bonds between the slime molecules (called hydrogen bonds), which are weaker bonds and can easily break and reform. The following activity compares two different kinds of slime/silly putty, with different amounts of cross linking.Ĭhemical explanation of how silly putty behaves: These cross links form a branching web of glue polymer molecules, giving the slime its thick texture. When borax is added it makes permanent (covalent) bonds between the glue molecules, called cross-links. The glue contains long molecules (called polymers). Play with the slime: it can flow between the fingers, but when it is suddenly pulled it breaks.Ĭhemical explanation of how slime is made: ![]() (For measuring everything individually, use recipe 2 below.) Students mix the cups together and stir quickly until combined. Give students 1 Tablespoon each in a cup. ![]() Give students 2 Tablespoons each in a cup.
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