Unit 5 Classification of Matter Section 10.1 and 12.1 The Nature of Matter

Level 3  Can identify chemical and physical properties of matter. And give examples of each.  Can identify whether a change is either a chemical or physical change.  Can distinguish between pure substances and mixtures.  Can identify mixtures as either Homogeneous or Heterogeneous.  Can, based on chem. formulas, identify a pure substance as either an element, compound or molecule.  Can state whether a material has high or low values of the below properties: TERMS  Lab: when given an object can determine its volume.  Can determine the density of an object from the slope of a mass vs. volume graph.  Can identify which term (accuracy, precision and resolution) applies to a given lab/measurement situation or example.  Can give examples of objects that have a mass of 1gm, a volume of 1ml and a length of 1cm.

Matter – anything that has mass and volume Matter is made of tiny particles called atoms. Democritus and Leucippus– Greek Philosophers – 1 st to use term atomos. Brownian Motion – all atoms move in a jerky motion

Matter MixtureSubstance Can NOT be broken down by physical means. Element Compound

SUBSTANCE Element – Composed of atoms – Can NOT be broken down – Periodic Table One capital letter Compound – Composed of elements joined chemically – Two or more capital letters Exception: Molecules – O 2, H 2

Matter Mixture Substance CAN be broken down by physical means. Heterogeneous mixture Homogeneous mixture

MIXTURES Homogeneous – A mixture that is the same throughout – Each sample is the same – Examples: Salt water Rubbing alcohol Closed can of pop Air Heterogeneous – A mixture in which the samples are not the same throughout. – Different proportions – Examples: Cup of sandy water Water with ice cubes Open can of pop

Ways of Separating Mixtures Physical Means Sorting Filtering Heating / Evaporation Cooling Chromatography Magnetism Chemical Means Electrolysis Chemical reactions Distillation