6Matter Mixtures Homogeneous Heterogeneous Pure Substances Solvent SolutionSolventColloidsHeterogeneousSuspensionsPure SubstancesElementMoleculeCompounds
7Atoms Elements The building blocks of Matter Consists of Protons (+), Electrons (-),and Neutrons (N).ElementsConsists of only one kind of atom,Cannot be broken down into a simpler type of matter by either physical or chemical meansCan exist as either atoms or molecules (more than 1 atom bonded together)Images are from
8MoleculesA molecule consists of two or more atoms of the same element, or different elements, that are chemically bound together.In the animation above, two nitrogen atoms(N + N = N2) make one Nitrogen molecule .
9Compounds Atoms of two or more different elements bound together. Can be separated into elements chemically, but not physically.In the animation above, water (H20) is a compound made of Hydrogen and Oxygen.Animated images and notes from
10Compounds contain more than one type of atom! Example of organic compound (a compound with carbon atoms):Carbon Dioxide – CO2 (1 atom of carbon and two atoms ofOxygen)Example of inorganicc compound (a compound without carbon atoms):Water – H2O (2 atoms of hydrogen and one atom of oxygen)
11- + IONS A particle with a neutral charge has the same number of An ion is an atom or group of atoms with a positive or negative charge!!A particle with a neutral charge has the same number ofprotons and electrons.An ion does not have the same number of electrons and protons.Examples of ions:He A helium atom that is missing one electron.The atom has one more proton than electron,and must have a positive charge.
19ColloidsParticle sizes are in between the size of particles found in solutions and suspensions .Can be mixed and remain evenly distributed without settling out.
20Physical vs. Chemical Change Changing from one state to another is aPhysical Change.If a new substance is formed it is aChemical Change.Images are from
21Physical vs. Chemical Changes Physical CluesChemical CluesChange in sizeChange in shapeChange in stateEasily reversedA color change occursA new chemical is formedIt is difficult to reverseEnergy in the form of light or heat is given offBubbles of gas are formed. A new odor may be noticed.
22Station Changes:1. Marshmallow melt: melted was physical, burnt is chemical2. Rip marshmallow: physical3. Alka-seltzer: chemical4. Baking soda and vinegar: chemical5. Food coloring: physical6. vinegar and milk: chemical7. sugar cube: physical
23Continued answers 8. rusty nail: chemical 9. burning candle: both 10. Toast burnt: chemical11: Baking a cake: chemical12: cutting paper: physical13. stretching rubber band: physical14. Melting ice/boiling water and evaporating water are all physical