This resource explores a useful model for the structure of matter based on simplified kinetic molecular theory. It was developed to help novice learners visualize the structure of solids, liquids, and gases as matter composed of tiny particles in constant motion. The animations help students understand how the movement of these particles is affected by temperature. The pacing of the animation allows it to be adaptable for middle school, high school, and college preparatory courses.
6-8: 4D/M1a. All matter is made up of atoms, which are far too small to see directly through a microscope.
6-8: 4D/M3ab. Atoms and molecules are perpetually in motion. Increased temperature means greater average energy of motion, so most substances expand when heated.
6-8: 4D/M3cd. In solids, the atoms or molecules are closely locked in position and can only vibrate. In liquids, they have higher energy, are more loosely connected, and can slide past one another; some molecules may get enough energy to escape into a gas. In gases, the atoms or molecules have still more energy and are free of one another except during occasional collisions.
6-8: 4D/M7a. No matter how substances within a closed system interact with one another, or how they combine or break apart, the total mass of the system remains the same.
6-8: 4D/M7b. The idea of atoms explains the conservation of matter: If the number of atoms stays the same no matter how the same atoms are rearranged, then their total mass stays the same.
6-8: 4D/M8. Most substances can exist as a solid, liquid, or gas depending on temperature.
11. Common Themes
6-8: 11B/M1. Models are often used to think about processes that happen too slowly, too quickly, or on too small a scale to observe directly. They are also used for processes that are too vast, too complex, or too dangerous to study.
6-8: 11B/M5. The usefulness of a model depends on how closely its behavior matches key aspects of what is being modeled. The only way to determine the usefulness of a model is to compare its behavior to the behavior of the real-world object, event, or process being modeled.
%0 Electronic Source %A Bishop, Mark %D 2009 %T An Introduction to Chemistry: The Structure of Matter %V 2013 %N 19 May 2013 %9 application/flash %U http://preparatorychemistry.com/KMT_flash.htm
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