part d: the performance test the lab practical part of the regents exam
TRANSCRIPT
Part D: The Performance Part D: The Performance TestTest
The lab practical part of the The lab practical part of the Regents ExamRegents Exam
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
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
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.
How to recognize an Igneous RockHow to recognize an Igneous Rock
Glassy Texture
Vesicular textureVesicular texture
Randomly Arranged Randomly Arranged Intergrown CrystalsIntergrown Crystals
How to recognize a Sedimentary RockHow to recognize a Sedimentary Rock
Contains FossilsContains Fossils
Clastic TextureClastic Texture
Layered Sediment
How to recognize a Metamorphic RockHow to recognize a Metamorphic Rock
Mineral Alignment or Foliation
Banding
Wavy bands or Distorted Structure
Mineral IdentificationMineral Identification
Based on the physical properties of the mineral sample
The physical properties are a result of the internal atomic arrangement
Cleave vs. FractureCleave vs. Fracture
To recognize cleavage, look for stair steps
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.
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)
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.
Mineral Sample
Cleaved Fractured
Scratches Glass
Scratches Glass
Softer than Glass
Softer than Glass
M M M MMN MN MN MN
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!
Some distance from New Some distance from New OrleansOrleans
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
Now with Pittsburgh, the Now with Pittsburgh, the epicenter is located!epicenter is located!
X marks the spot!X marks the spot!
Station 3: OrbitsStation 3: Orbits
Orbits are ellipses!
A perfect circle has an eccentricity of zero!
E = 0
E = 0.75
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!
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
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
Use the eccentricity equation:Use the eccentricity equation:
2.0 cm ÷ 5.3 cm = 0.3773584
Round to the nearest thousandth
0.377
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.”