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Physical & Chemical Properties & Physical & Chemical Changes.

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Presentation on theme: "Physical & Chemical Properties & Physical & Chemical Changes."— Presentation transcript:

1 Physical & Chemical Properties & Physical & Chemical Changes

2 Physical Properties IdentificationExamples  Usually a measurable characteristic you can observe without changing the chemical formula or composition such as  Density (universal p.p.)  Size/Shape  Color  Temperature of phase changes  Melting point, boiling point, freezing point, condensation point  State of matter, Texture, Hardness, Odor, Conductivity, etc.  Physical Properties of Water  Density = 1.0 g/mL  Clear Liquid  Boils & 100°C  Freezes & 0°C  Physical Properties of Alcohol  Density =.789 g/mL, clear, liquid, BP/CP = 80°C, MP/FP = -114°C  Physical Properties of Iron  Solid, metallic, responds to a magnet, conducts electricity, 2750°C, etc.

3 Physical Changes IdentificationExamples  A change in appearance (size, shape, state) without a change in the composition (chemical make up)  Tearing/Breaking  Dissolving  Phase changes (boiling, evaporating, condensing, sublimating, depositing, melting, freezing (solidifying)  Physical Changes in Water  Water freezes to form ice  Breaking an icicle  Boiling water  Physical Changes in Alcohol  Evaporates quickly  Physical Changes in Iron  Melting iron to pour in a mold.  Magnetizing an iron bar with a blow or electromagnet.

4 Chemical Properties IdentificationExamples  The ability to react with other substances  Doesn’t mean it has changed but that it could in the right conditions  Must have been observed reacting in the past to know this  Flammability  Corrosivity  Toxicity (poisonous)  pH  Reactvity  Chemical Properties of Water  Ability to react with metals to from bases/corrosion  Ability to react with nonmetals to form acids  Chemical Properties of Alcohol  Flammable (ability to burn)  Toxic in moderate quantities  Chemical Properties of Iron  Ability to rust.

5 Chemical Changes IdentificationExamples  A reaction where new (different) substances are formed  Can be written as a chemical equation  Evidence a Chemical Change occurs  Change in color (without dyes)  Change in odor  Gas is produced (no heat added)  Solids forming from liquids (precipitate)  Spontaneous change in temperature (no heat added)  Light is produced  Chemical Changes in Water  Hydrolysis separates water into hydrogen & Oxygen  Water reacting with sodium to form Sodium Hydroxide and hydrogen gas  Chemical Changes in Alcohol  Alcohol burning to form CO2 and H2O and heat  Chemical Changes in Iron  Iron combining with oxygen to from rust (Fe2O3)

6 Identification Time  Identify each of the following as either a Physical Property, Physical Change, Chemical Property or a Chemical Change:  The color of the desktops are green  Zinc has the ability to corrode when wet  Moriah broke her bumper when she hit a deer  The food I eat is converted into waste

7 Check your lab data & notes  Does a spontaneous change in temperature indicate a physical or chemical change?  Which experiments resulted in a temperature change?  Which ones were chemical? Physical? Why?  Does a spontaneous change in color indicate a physical or chemical change?  Which experiments resulted in a color change?  Which ones were chemical? Physical? Why  Does a spontaneous production of gas (bubbling) indicate a physical or chemical change?  Which experiments resulted in gas production?  Which ones were chemical? Physical? Why?

8 Compare/Contrast Physical v. ChemicalProperty v. Change


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