part d: the performance test the lab practical part of the regents exam
TRANSCRIPT
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Part D: The Performance Part D: The Performance TestTest
The lab practical part of the The lab practical part of the Regents ExamRegents Exam
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The ExamThe Exam – – Parts A, B, & C are Parts A, B, & C are worth about 85% of the overall worth about 85% of the overall
score.score.
Part A: 35 Multiple choice questions
Part B1: 15 Multiple choice questions
Part B2: ~ 15 Constructed response questions
Part C: ~ 15 Constructed response questions
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3 stations – 9 minutes for 3 stations – 9 minutes for each stationeach station
1. Rocks & Minerals
2. Locating an Epicenter
3. Drawing an Elliptical Orbit
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Station OneStation One• Classify two rock hand samples as
either igneous, sedimentary, or metamorphic and give an observable characteristic as a reason for the classification.
• Identify one mineral sample by testing its physical properties of hardness, streak, cleavage, and luster.
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How to recognize an Igneous RockHow to recognize an Igneous Rock
Glassy Texture
Vesicular textureVesicular texture
Randomly Arranged Randomly Arranged Intergrown CrystalsIntergrown Crystals
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How to recognize a Sedimentary RockHow to recognize a Sedimentary Rock
Contains FossilsContains Fossils
Clastic TextureClastic Texture
Layered Sediment
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How to recognize a Metamorphic RockHow to recognize a Metamorphic Rock
Mineral Alignment or Foliation
Banding
Wavy bands or Distorted Structure
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Mineral IdentificationMineral Identification
Based on the physical properties of the mineral sample
The physical properties are a result of the internal atomic arrangement
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Cleave vs. FractureCleave vs. Fracture
To recognize cleavage, look for stair steps
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StreakStreak – The color of the mineral – The color of the mineral in powdered form; tested by in powdered form; tested by
rubbing the sample against an rubbing the sample against an unglazed porcelain tile.unglazed porcelain tile.
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Hardness – Moh’s ScaleHardness – Moh’s Scale
• Resistance to being scratched
• Harder than glass (scratches glass)
• Not as hard as glass (doesn’t scratch glass)
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Luster – How it reflects lightLuster – How it reflects light
• Metallic
• Non-Metallic
• Don’t confuse shiny with metallic. Non-metallic minerals may have a glassy, shiny luster.
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Mineral Sample
Cleaved Fractured
Scratches Glass
Scratches Glass
Softer than Glass
Softer than Glass
M M M MMN MN MN MN
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Station 2: Locating an Station 2: Locating an Earthquakes EpicenterEarthquakes Epicenter
• Information from 3 seismic stations is needed.
• Use the S-P lapse time & p.11 of the ESRT to determine the distance each station is from the epicenter.
• Use a compass to draw circles that distance from each station
• Where the 3 circles meet is the EPICENTER!
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Some distance from New Some distance from New OrleansOrleans
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Some distance from NYC. Now Some distance from NYC. Now the Epicenter is in one of two the Epicenter is in one of two
possible locationspossible locations
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Now with Pittsburgh, the Now with Pittsburgh, the epicenter is located!epicenter is located!
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Station 3: OrbitsStation 3: Orbits
Orbits are ellipses!
A perfect circle has an eccentricity of zero!
E = 0
E = 0.75
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EccentricityEccentricity
• E = distance between the foci (center points) ÷ length of the major axis (long-ways)
• Eccentricity has to be between zero and one. Never more than one!
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Measure the distance between the Measure the distance between the foci (to the nearest tenth of a cm)foci (to the nearest tenth of a cm)
2.0 cm
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Measure the length of the major Measure the length of the major axis (to the nearest tenth of a cm)axis (to the nearest tenth of a cm)
5.3 cm
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Use the eccentricity equation:Use the eccentricity equation:
2.0 cm ÷ 5.3 cm = 0.3773584
Round to the nearest thousandth
0.377
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Compare Compare the eccentricity of your the eccentricity of your
shape to the shape of a known orbitshape to the shape of a known orbit..If given Mercury
(0.206), then
“My shape, with an eccentricity of 0.377 is more elliptical than the orbit of mercury.”
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