CAS CH 102 Lecture Notes - Lecture 12: Kelvin, Celsius, Chemical Change
Document Summary
Physical change- substance changes its physical appearance but not its compositions. Chemical change or chemical reaction- substance is transformed into a chemically different substance: separations of mixtures. Many properties of matter are quantitative associated with numbers. Metric system- unit used for scientific measurements: si units. Si units- particular choice of metric units for use in scientific measurements. Prefixes are used to indicate decimal fractions or multiples of various units: length and mass. Si unit of length is meter, distance slightly longer than a yard. Mass- measure of amount of material in an object. Si unit of mass is kilogram: temperature. Measure of hotness or coldness of an object physical property to describe heat flow. Heats flows from high temp to low temp. Celsius scale- based on assignment of 0 c to freezing point of water and. Kelvin scale- si temperature scale and si unit is kelvin (k) Kelvin unit equal to degree of celsius.
