If the graph represents the decay of potassium-40 sample, what mass of the parent isotope remains after 2.52 x 109 years?

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

According to le chatelier’s principle, a system in chemical equilibrium responds to stress by shifting the equilibrium in a direction that reduces the stress. normalizes the stress. increases the stress. changes the stress.

Condensation happens when water vapor cools. true or false? ?