If a 1.85 g mass of zinc produces 475 ml of gas and your balloon weighs 0.590 g and the room temperature is 23.5°c. calculate the amount of zinc needed to produce enough gas to get your balloon airborne by adding 1 ml to the required balloon volume so that its density is less than that of the surrounding air. (hint: complete balloon volume calculation as you did in question 2 above)

Measuring which physical property is most likely to produce the most precise results when trying to identify a substance

Which of these conditions most likely produces an unstable isotope?

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