Matter_

  1. Matter is anything that occupies space and has mass.   2. Matter can be classified into elements and compounds.   3. An element is a substance that consists of only one type of atom.   4. A compound is a substance...

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probing Matter

  Evidence for the atomic model The simple atomic model pictures the atom as a tiny, positively-charged nucleus surrounded by negatively-charged particles (electrons) in orbit. Evidence for this model comes from the scattering of alpha particles as...

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Light and Matter

  The photoelectric effect Light and matter interact. Matter emits and absorbs electromagnetic radiation, losing energy to radiation or taking energy away from it. These processes tell us a lot about the nature of the world. One type of absorption...

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The Particle Structure of Matter

  The existence of particles The kinetic model pictures a gas as being made up of large numbers of individual particles in constant motion. At normal pressures and temperatures the particles are widely spaced compared to their size. The motion of...

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The Effects of Heat on Matter

  1. Matter exists in three states, solids, liquids and gases.   2. The physical state of matter can be changed by heating or cooling (changing the temperature) the matter.   Changes of state 1. All substances on Earth can...

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