Unit 1 test Flashcards
mass
a measurement of the amount of matter an object contains
volume
a measure of space occupied by the object.
extensive property
a property that depends on the amount of matter in a sample.
intensive property
a property that depends on the type of matter in a sample no the amount.
substance
matter that has a uniform and definite composition.
physical property
a quality or condition of a substance that can be observed or measured without changing the substances composition
solid
a form of matter that has definite shape and volume (particles are packed tightly together)
liquid
a form of matter that has an indeifinite shape and flows but has a fixed volume (particles are free to flow)
gas
a form of matter that takes both the shape and volume of its container (particles are far apart)
physical change
some properties of a material change but the compostion of the material does not change.
mixture
physical blend of two or more components.
heterogeneous mixture
a mix in which the composition is not uniform throughout.
phase
term used to describe particles sample with uniform compostion and properties
homogeneous mixture
a mix in which the composition is uniform throughout.
filtration
process separating solid from liquid in hetero geneous mixture.
distillation
liquid boiled to produce a vapor that is then condensed into a liquid
element
simplest form of matter
compound
substance that contains two or more elements that are chemically combined.
chemical change
a change that produces matter with a different compostion that the original matter
chemical property
the ability of a substance to undergo a specific chemical change
chemical reaction
one or more substances change into one or more new substance.
reactant
substance present at the start of the reaction
product
substance produced in the reaction
precipitate
a solid that forms and settles out of a liquid mixture
law of consevation of mass
in any physical change of chemical reaction mass is conserved (mass is neither created or destroyed)
measurement
a quantity that has both a number and a unit
accuracy
measure of how close a measurement come to the actual value of whatever is measured
precision
a measure of how close a series of measurements are to one another
accepted value
correct value for the measurement based on reliable references
experimental value
value measured in lab
percent error
((experimental value - accepted value)/ divided by accepted value) * 100
si unit of volume
liter
si unit of mass
kg
weight
force that measures the pull on a given mass
density
mass divided by volume m/v
