introduction vocabulary

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Chemistry

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23 Terms

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