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30 Cards in this Set

  • Front
  • Back
What is matter
anything that has mass and takes up space
What is mass
the mass of an object is the amount of matter the object contains
what is substance
matter that has a uniform and definite composition
what is a physical property
a quality or condition of a substance that can be observedor measured without changing the substance's compostion
solid
matter that has definate shape and volume
liquid
a form of matter that flows, has a fixed volume, and takes the shape of its container
gas
a form of matter taht takes both the shape and volume of its container
vapor
the gaseous state of a substance that is generally a liquid or solid at room temp
physical change
a change which alters a given material without changing its composition
mixture
a physical blend of two or more substances
heterogeneous mixture
one that is not uniform in composition
homogeneous mixture
one that has a completely uniform compostions, its components are evenly distributed throught the sample
solutions
homogeneous mixtures
phase
any part of a system with uniform compostion and properties
distillation
a liquid is boiled to produce a vapor that is then condensed again to a liquid
elements
the simplest forms of matter that can exist under normal laboratory conditions, cannot be seperated into simpler substances by chemical means, they are building blocks for all other substances
compounds
substances that can be separated into simpler substances only by chemical means
chemical symbol
symbol each element is represented by
chemical reaction
one or more substances change into new substances
reactants
the starting substances in a chemical reaction
products
the substances formed in a chemical reaction
chemical property
the ability of a substance to undergo a chemical reaction and go to form new substances
law of conservation of mass
ina ny physical change or chemical re3action, mass is neither created or destroyed; it is conserved
quantitative measurements
givesresults ina definite form, usually as numvers and units
accuracy
a measure of how close a measurement comes to the actual or true value of whatever si measured
precision
measure of how close a series of measurements are to one another
density
ratio of the mass of an object to its volume
dalton's atomic theory
1. all elements are composed of tiny indivisible particles called atoms
2. atoms of the same element are identical. the atoms of any one element are different from those of any other element
3. atoms of different elements can physically mix together or can chemically combine with one another in simple whole-number ratios to form compounds
4. chemical reactions occur when atoms are separated, joined, or rearranged. atoms of one element, however, are never changed into atoms of another element as a result of a chemical reaction
atom
the smallest particle of an element that retains the properties of that element
cathode ray
a stream of electorns produced at the negative electrode of a tube containing a gas at low pressure