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!

http://charlesburrows.com/regents2b/index_10.htm

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.”