Which of the following is a qualitative observation? Steve added lead(IV) iodide to 250 mL of water
A violent reaction resulted when 1 g of sodium was added to water.
Bromothymol blue indicator caused the solution to turn yellow.
The reaction produced 2.55 g of precipitate.

Subduction zones occur on earth where dense oceanic crust dives under more buoyant continental crust. these boundaries are characterized by a deep ocean trench next to a high continental mountain range, large numbers of earthquakes and volcanoes. all of this is further evidence for the a) big bang theory b) origin of the species eliminate c theory of plate tectonics d theory of natural selection 4 sedimentary rocks found high in the himalayen mountain

Apump contains 0.5 l of air at 203 kpa. you draw back on the piston of the pump, expanding the volume until the pressure reads 50.8 kpa. what is the new volume of the air pump

Stage in which a star’s outer layers have started to cool and grow outward?