Thermal cracking of alkanes usually

Q: Thermal cracking of alkanes usually

Thermal cracking of alkanes usually involves decomposition ✓ is an exothermic process produces only small alkanes requires hydrogen Explanation Three rock types by formation: Igneous (from cooled magma/lava) - granite, basalt. Sedimentary (from compressed sediments) - sandstone, limestone, shale. Metamorphic (changed by heat/pressure) - marble, slate, quartzite. Igneous rocks: intrusive (cooled slowly underground, large crystals) vs extrusive (cooled quickly on surface, small crystals). Sedimentary rocks often contain fossils and form in layers. Rock cycle: any rock type can transform into another given enough time and the right conditions. Rocks weather into sediments, compress into sedimentary rock, metamorphose under pressure, or melt and cool into igneous rock.

Question

Answer 1

Thermal cracking of alkanes usually

involves decomposition ✓
is an exothermic process
produces only small alkanes
requires hydrogen

Explanation

Three rock types by formation: Igneous (from cooled magma/lava) – granite, basalt. Sedimentary (from compressed sediments) – sandstone, limestone, shale. Metamorphic (changed by heat/pressure) – marble, slate, quartzite.

Igneous rocks: intrusive (cooled slowly underground, large crystals) vs extrusive (cooled quickly on surface, small crystals). Sedimentary rocks often contain fossils and form in layers.

Rock cycle: any rock type can transform into another given enough time and the right conditions. Rocks weather into sediments, compress into sedimentary rock, metamorphose under pressure, or melt and cool into igneous rock.