Studied by 8 people
chemistry
the study of the composition of matter and the changes matter undergoes
hypothesis
a proposed explanation for an observation
matter
anything that has mass and occupies space
observation
when you use your senses to obtain information
scientific methodology
a general style of investigation with a logical systematic approach to the solution of a scientific problem
theory
a well tested explanation for a broad set of observations
chemical change
a change that produces matter with a different composition than the original matter [observations include has given off, precipitates formed, temperature change, or color change]
compound
a substance that contains two or more elements chemically combined in a fixed proportion [can be separated chemically]
element
the simplest form of matter that has a unique set of properties [cannot be seperated]
gas
a form of matter that takes both the shape and volume of its container
heterogeneous mixture
a mixture in which the composition is not uniform throughout [can be separated physically]
homogeneous mixture
a mixture in which the composition is uniform throughout [can be separated physically]
law of conservation of mass/matter
states that im any physical change or chemical reaction, mass is conserved. Mass is neither created nor destroyed.
liquid
a form of matter that has an indefinite shape, flows, yet has a fixed volume
mixture
a physical blend of two or more components
physical change
some properties of a material change but the composition of the material does not change
solid
a form of matter that has a definite shape and volume
solution
another name for a homogeneous mixture
accuracy
a measure of how close a measurement comes to the actual or true value of whatever is measured
density
the ratio of the mass of an object to its volume [a physical property that represents how close or far apart the particles of a substance are, D=m/v]
precision
a measure of how close a series of measurements are to one another, irrespective of the actual value
accepted value
the correct value for the measurement based on reliable references
measured value
the value measured in the lab
Note 
Flashcard (55)