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25 terms

Che 105 Test 1

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Atoms
submicroscopic particles, fundamental building blocks of ordinary matter
Molecules
two or more atoms attached together in a specific geometrical
arrangement, come in different shapes and patterns
Law
a concise statement of a relationship between phenomena that is always the same under the same conditions.
Theory
a unifying principle that explains a body of facts and/or those laws that are based on them
Matter
anything that occupies space and has mass
Composition
types of particles, arrangement of the particles, attractions and attachments between the particles
State
whether it's solid, liquid, or gas
Solid
Rigid shape, Maintains volume, not compressible, doesn't flow
Liquid
Assumes, containers shape, maintains volume, not compressible, flows
Gas
Assumes containers shape, maintains volume, compressible and flows
Pure Substance
Made up of only one component and its composition is invariant, All samples show the same intensive properties
Mixture
Made up of two or more components in proportions that can vary from one sample to another, samples may show different intensive properties
Element
Made of one type of atom (some
elements found as multi-atom molecules in nature), combine together to make
compounds
Compound
Made of one type of molecule, or an array of ions, Units contain two or more different kinds of atoms
Physical properties
the characteristics of matter that can be changed without changing its composition - odor, color, density, appearance, melting point, boiling point, etc.
Chemical properties
the characteristics that a substance displays only by changing its composition via contact with other matter or the influence of energy (a chemical change) - corrosiveness, flammability, acidity, toxicity, etc.
physical
The boiling of water is a _______ change
Chemical
The rusting of iron is a ________ change
extensive property
depends upon how much matter is being considered.
Intensive property
does not depend upon how much matter is being considered.
Energy
he capacity to do work
kinetic or potential
Energy is classified as either
Kinetic
is energy of motion
Potential
is energy that is stored in the matter
Law of Conservation of Energy
_______ states that whatever process you do that converts energy from one type or form to another, the total amount of energy remains the same