In a redox reaction, why does an element’s oxidation number decrease? A.
An element’s oxidation number decreases because it gained electrons.
B.
An element’s oxidation number decreases because it exchanged electrons.
C.
An element’s oxidation number decreases because it lost electrons.
D.
An element’s oxidation number decreases because it was heated.

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b.slope c.benchmark d. index contour

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic

How many moles are in 123.0 grams of kclo4?