26 terms

chemistry - 9th grade

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Terms in this set (...)

matter
anything with mass that takes up space
physical property
characteristic of a living thing that does not involve a chemical change ex: phys change - melting or boiling point
chemical change
change that occurs when one or more substances change into an entirely new substance ex; charcoal to burn in air
chemical properties
property of matter that describes substances ability to participate in chemical reaction
pure substance
sample of matter, wither a single element or a single compound, that has definite chemical and physical properties
element
substance that can not be broken down, all atoms have same atomic number
compound
a substance made up of atoms of two or more different elements joined by chemical bonds
mixture
combination of two or more substances that are not chemically combined
Solution
a homogenous mixture of two or more substances uniformly dispersed throughout a single phase ex: salt water
solvent
in a solution, the substance in which the solute dissolves, ex: water in salt water
solute
in a solution, the substance that dissolves in the solvent ex: salt in salt water
alloy
mixture of 2 or more metals exx: chrome, brass, steel
aqueous
dissolved in water
homogenous
solution that is uniform in composition - same proportion of components throughout ex: salt water solution
physical properties examples
hard/soft, pourous, round/straight edges, smooth/rough,shiny vs. non-metallic, color, thickness, flexibility, makes noise when dropped,
chemical properties
reacts with......, flammable
heterogenous
not uniform throughout - clay and water - heavier clay particles concentrate on the bottom of the container
solid
state has definite volume
gas
state has neithe definite volume or definite shape
liquid
state has definite volume but indefinite shape
extensive property
properties that depend on the amount of matter that is present (properties include mass, volume, amount of energy)
intensive property
properties that do NOT depend on the amount of matter present (such as melting point, boiling point, density, ability to conduct,)
plasma
fourth state of matter - high temperature physical state of matter in which atoms lose most of their electrons, (found in flourescent bulbs)
metal
conductor of heat and electricity
nonmetals
low conductivity (gases are examples)
metalloids
have characteristics of both metals and non-metals