Chapter+1+Atoms+First - Chemistry 161 Solid GEMS Professor...

This preview shows page 1 - 7 out of 15 pages.

I-1Chemistry 161Solid GEMSProfessor VassilianText:ChemistryAtoms FirstBy:Julia Burdge and Jason Overby
I-2Chemistry(all around you)BiologyMedicineAgricultureEngineeringEnvironmental ScienceForensic ScienceEtc.
I-3Chapter 1The Study of ChemistryChemistryisthe study of composition, structure, properties andtransformation of matter. Matter is anything that occupies space and hasmass. The building blocks of matter are atoms or molecules. TheATOMis the basic unit of all elements that enters into chemical transformations(reactions)Atoms have been given symbols to identify them (periodic table)HhydrogenOoxygenCucopperNasodium(natrium)Kpotassium(kalium)Feiron(ferrum)
I-4Scientific Method :Sequence of steps that a “scientist” takes to acquireknowledge.( Don’t have to be a scientist to follow a scientific method )Observationof a phenomenon(chemical/physical etc) could beas a result of experiments leadingto empirical (experimental) facts-gathering data.Hypothesis (probable ortentative explanation)Testing the hypothesisby experimentsLaws:Formulation and/orgeneralization of testedhypothesis (could be inmathematical form or otherwise).-They tell us what happens, notwhy they happen – noexplanation.Theory(that explainsmany different laws):It is a tested explanationof basic naturalphenomena, which canbe used to make furtherpredictions.
I-5Classification of MatterMatterPure SubstanceMixturesseparatedby physical meansElementsH2SO2Compounds- water (H2O)-sulfuric acid,(H2SO4)HeterogeneousHomogeneous- composition andproperties differentfrom one part toanother- oil and water- gasoline + waterThese aresolutions thathave uniformcompositions andproperties- sugar dissolvedin water- salt dissolved inwaterhomogenized milkis a heterogeneousmixture!(you can see the fatglobules through amicroscope)broken downto elements bychemical techniques
I-6Properites of Matter1.Physical Properites and Physical ChangeAphysical propertyof a substance is a property that does not alter thechemical composition of a substance.The identity of the substanceremains unchanged.These properties include;color,melting point,boilingpoint,solubility,etc.- gold is malleable- can be hammered into thin sheets- sulfur is brittle- it crumbles into pieces when struckaphysical changechanges a substance from one physical state (solid,liquid, gas) to another physical state (solid, liquid, gas)without changingthe identityof the substance.SolidLiquidGasPhysical PropertiesExtensiveIntensiveProperties that depend onthe sample size.

Upload your study docs or become a

Course Hero member to access this document

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 15 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Spring
Professor
vacillian
Tags
Chemistry, Atom, International System of Units, Lord Kelvin, S F

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture