SAT CHEMISTRY EXAM
QUESTIONS AND CORRECT
ANSWERS WITH RATIONALES
GRADED A+ LATEST
Earth structure - answer-1. Crust - outer thin layer where we locate
2. Mantle - mostly solid, closer to core can flow slowly
3. Core - hot iron and nickel
Tectonic plates - answer-When crust + upper part of mantle are cracked into number of
large pieces that move slowly. Two plates meets lead to volcano & earthquakes
Rocks generally - answer-Rock in crust are made from minerals
Elements (silicon & oxygen) -> compound (silicon dioxide) -> mineral (quartz) -> rock
(granite)
Igneous rock (formed by/ appearance and why/example) - answer-Formed by - magma
which is push up through crust due to its less density and impressive heat
Magma contains various minerals in random arrange interlocking crystal
Size of crystal connects to speed of cooling
-> large = slowly (atom have time to arrange, migrate and attach)
Example: intrusive granite, extrusive basalt
Igneous rock (two types) - answer-1. Intrusive - cools slowly underground expose as
rock wear away, often have big crystal, rise up due to density of magma
2. Extrusive - cools quickly above ground, crystal small, caused by tectonic movement
Sedimentary rock (formed by 2/ appearance and why/ example) - answer-Formed by
1. Layering of sediment in lakes or sea for million year
2. Water evaporates leave dissolved solids behind
Layers are cemented together by other minerals
No crystal only grains cemented tgt with fossils
QUESTIONS AND CORRECT
ANSWERS WITH RATIONALES
GRADED A+ LATEST
Earth structure - answer-1. Crust - outer thin layer where we locate
2. Mantle - mostly solid, closer to core can flow slowly
3. Core - hot iron and nickel
Tectonic plates - answer-When crust + upper part of mantle are cracked into number of
large pieces that move slowly. Two plates meets lead to volcano & earthquakes
Rocks generally - answer-Rock in crust are made from minerals
Elements (silicon & oxygen) -> compound (silicon dioxide) -> mineral (quartz) -> rock
(granite)
Igneous rock (formed by/ appearance and why/example) - answer-Formed by - magma
which is push up through crust due to its less density and impressive heat
Magma contains various minerals in random arrange interlocking crystal
Size of crystal connects to speed of cooling
-> large = slowly (atom have time to arrange, migrate and attach)
Example: intrusive granite, extrusive basalt
Igneous rock (two types) - answer-1. Intrusive - cools slowly underground expose as
rock wear away, often have big crystal, rise up due to density of magma
2. Extrusive - cools quickly above ground, crystal small, caused by tectonic movement
Sedimentary rock (formed by 2/ appearance and why/ example) - answer-Formed by
1. Layering of sediment in lakes or sea for million year
2. Water evaporates leave dissolved solids behind
Layers are cemented together by other minerals
No crystal only grains cemented tgt with fossils
