The cesium-131 nuclide has a half life of 30 years. After 90 years, 6.00 g remain. What is the original mass of the cesium sample? I need the answer with work shown.

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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