![]() What do you notice? How many directions of ordering can you find? Do any of the rows of atoms go all the way from one side to the other? What happens at the edges? Write down your observations. Keep shaking until all of the atoms line up in straight lines, as seen in the picture to the right. Gently shake the bowl from side to side and watch how the “atoms” move. To begin, pour enough of the smaller candy into the bowl to cover the bottom with one layer of candy. Activityįirst, you will make a large-scale model of a crystalline solid. SafetyĬaution should be taken when shaking the model. If you have them, marbles and BBs work well. Gobbstoppers (for the smaller) and Whoppers (for the larger) work well. Both types of candy should be perfectly round. *Candies should be different in size, but larger candy should be no more than 3 times larger than the small candy. Finally, you will model a grain boundary between two grains. In this experiment, you will make a large-scale model of the atoms of a single grain, and then an amorphous solid. The section in between the grains where the atoms have no order is the grain boundary.Ĭan you use the scales to estimate how big the grains are? How wide are the grain boundaries? The sections where the atoms are lined up are the grains because they have long-range order. The picture on the right is zoomed in even further, and shows the actual atoms of a grain boundary. ![]() Next, if we zoom in, the picture in the middle shows a close up of a grain boundary. A grain boundary is simply where two grains meet. The dark lines in between the grains are what we call grain boundaries. Each little piece that looks like a stone is one grain. In the pictures below, the picture on the left shows grains. Window glass is a very common amorphous solid.Ī grain is a piece of a crystalline solid that has all of the atoms lined up (long-range order). ![]() Unlike a crystalline solid where the atoms do line up (long-range order), the atoms in an amorphous solid are not in straight lines. Can you picture the atoms that make up the materials in your everyday life? How are they arranged?Īn amorphous solid is a solid made of atoms that do not have long-range order (the don’t line up like in the picture above). ![]()
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