1.1 Matter

Matter Vocabulary
Element - a substance that can't be broken down into a simpler substance
Ex) Na, Si, H2,, S8
Compound - a substance composed of more than one element
Ex) CO2, NaCl, NaHCO3
Pure Substance - any single element or any single compound
Mixture - A combination of more than one substance (element and/or compound)
Homogeneous Mixture - A mixture with uniform composition
Ex) Air, salt water (unsaturated solution)
Heterogeneous Mixture - A mixture lacking uniform composition
Ex) Paint, oil/vinegar salad dressing
Chemical Change - a change that involves the conversion of at least one substance into a different substance
Physical Change - a change in which no substances are converted into different substances
Intensive Property - -A property independent of sample size
Ex) Melting point, boiling point, density
Extensive Property - A property dependent upon sample size
Ex) Mass, volume
Precision - Of or relating to how close multiple measurements of the same value are to each other (independent of how close they are to the true value)
Accuracy - The degree to which a measurement corresponds to the ‘true’ value.