Students are studying a mineral. they observe that the mineral can be scratched by glass and a streak plate. however, the mineral cannot be scratched by an iron nail or copper penny. According to the hardness scale above, which mineral are the students most likely testing? A. Apatite
B. Topaz
C. Feldspar
D. Fluorite

Write the complete balanced equation for the reaction between lead (iv) oxide (pbo2) and water (h2o).

During trial 2, what allowed you to determine that aluminum was the limiting reactant? check all that apply. all of the copper dissolved. all of the aluminum dissolved. the solution turned clear. the number of grams of copper(ii) chloride used in the reaction was greater than the number of grams of aluminum. the molar ratio of copper(ii) chloride to aluminum was greater than 3: 2, the equation’s molar ratio.

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