Chemistry - Marsella Science · Physical vs Chemical Changes Chemical Change CHANGE the COMPOSITION...
Transcript of Chemistry - Marsella Science · Physical vs Chemical Changes Chemical Change CHANGE the COMPOSITION...
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Visual Vocab
Chemistry
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Chemical vs Physical Properties
Chemical properties:•Characteristics which are exhibited as ONE substance is chemically TRANSFORMED into ANOTHER
○ Examples: reactivity and flammability
Physical properties:•Characteristics that can be OBSERVED WITHOUT changing the identity of the subject.
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Chemical or Physical??
SMELL
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Chemical or Physical??
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Chemical or Physical??
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Chemical or Physical??
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Physical vs Chemical Changes
Chemical Change
CHANGE the COMPOSITION (make up) and IDENTITY of the matter involved.
Some common signs of chemical changes includes:○ odor (smell)○ production of heat○ fizzing/ bubbling○ CANNOT be easily reversed
Physical Change
Physical changes do NOT change the composition of a substance.
Many physical changes can be EASILY reversed.
Examples include: * melting ice *boiling water *breaking glass
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Let’s Practice!
On your whiteboard write whether each picture represents a physical or chemical change
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Chemical or Physical??
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Chemical or Physical??
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Chemical or Physical??
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Chemical or Physical??
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Chemical or Physical??
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Chemical or Physical??
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Chemical or Physical??
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Chemical or Physical??
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Matter•is anything that has MASS and takes up SPACE
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Mass● a measure of the amount of matter in an object.
● ALWAYS constant. Does NOT change based on location.
● TOOL USED TO MEASURE: a Triple Beam Balance (TBB)
● UNITS: Grams (g) or Kilograms (kg)○ 1 kg= 1000 grams
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Weight● a measure of the gravitational force exerted on an object.
● Its value can CHANGES with the location of the object in the universe.
● TOOL USED TO MEASURE: a spring scale
● UNITS: Newton (N)
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VOLUMEmeasures the amount of SPACE that object occupies.
REGULARLY shaped solid object:
Volume = length × width × height
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VOLUME of REGULARLY shaped solid objects
TOOL USED TO MEASURE: RULER
UNITS: Cubic centimeters (cm3)
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VOLUMEIRREGULARLY shaped object :Measure the volume of water that the object displaces.
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VOLUME of IRREGULARLY shaped solid objects
TOOL USED TO MEASURE: GRADUATED CYLINDER
UNITS: Liters (L) and milliliters (mL)
○ 1 mL = 1 cm3
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DENSITY● is the amount of mass per unit of volume.● Density= mass divided by volume● Density of water is 1 g/cm3
○ TOOL USED TO MEASURE: ruler, graduated cylinder, triple beam balance
○ UNITS: grams per cubic centimeters (g/cm3)
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Copyright © by Holt, Rinehart and Winston. All rights reserved.
ResourcesChapter menu
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Ductility The ability for a metal to be pulled into a wire.
Example: Copper is a common material used to make wire
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MalleabilityThe ability of a metal to be rolled or pounded into thin sheets.
Example: Gold, Aluminum
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SolubilityThe ability of a substance to dissolve in another substance
Example: salt in water dissolves to become salt water.
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Thermal conductivityIs the rate at which a substance transfers heat.
Example: styrofoam is an insulator which means its a poor conductor. Metals are good conductors.