Vocabulary Flashcard

MATTER

  • Physical substances (particles)that occupy space and possess rest mass; that makes up all obversable objects
  • it exists in four states: solid, liquid, gas, plasma

ENERGY

  • the ability to do work, or the ability to move or elicit change in matter
  • can be seen in different forms: kinetic, potential, radiant, electromagnetical
  • is measured in SI units joules

SOLID, A FORM OF MATTER

  • Solid has definite shape and volume; its particles or atoms are tightly packed or bound together in geometric lattice
  • characterized by structural rigidity and resistant to changes of shape or volume
  • chrystalline solids: metals and ice; amorphous solid: window glass

LIQUID, A FORM OF MATTER

  • takes no definitive shape but volume; the particles cluster or bound together with room to move around
  • made up of tiny vibrating particles as atoms and molecules held together by intermolecular bonds
  • has ability to flow called fluid; has density close to solid termed condensed matter

GAS

  • it has no definitive shape of volume; particles in gas move around freely
  • made up of individual atoms eg. noble or atomic gas Neon, emental molecules made up of one type of atom eg. Oxygen, or compound molecules CO2

FUSION – MELTING POINT

  • solid to liquid state
  • when you take ice -5C and heat it on your stove, the temperature of the ice rises as heat cause ice particles to vibrate faster and faster
  • they eventually break free of crystal lattice and come apart form liquid
  • the temperature which substance melts occurs is the MP; 32F or 0*C

FREEZING POINT
FUSION MELTING POINT (2)

  • In the ice the molecules are strongly bonded to one another, thus forming a rigid solid. 
  • When heat is added to the ice these bonds are broken and the ice melts. The molecules afterward bond to one another with less strength and a different geometry, and water is formed.
  •  Now, before the melting, the molecules were actually moving when in the solid state. 
  • They were vibrating back and forth. They had an average kinetic energy. 
  • So they had a Kelvin temperature proportional to this average kinetic energy.
  •  After the melting the water molecules are still vibrating. And they have the same average kinetic energy as they had before the melting. 
  • So, the water is at the same temperature at the moment after the melting that the ice was at the moment before the melting.

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